fix(a11y): review-wave fixes (P3-4)

- `?` shortcut now stopImmediatePropagation so RoomView's type-to-focus handler
  doesn't steal focus into the composer behind the dialog (and swallow Escape) —
  CONFIRMED review finding.
- Typing live region stays mounted (empty when idle) so the FIRST "X is typing"
  is reliably announced (a status region added with its text isn't always read).
- Removed a stray empty `{}` JSX expression in MediaGallery (leftover from an
  auto-fix).

Reviewer verified the rest: collapsed-message labels, focus-return
classification (4 dialogs fixed, popouts correctly left), and all aria fixes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LOTUS_BUGS.md

@@ -16,7 +16,7 @@ step-by-step checks in [`LOTUS_TESTING.md`](./LOTUS_TESTING.md).
 Implemented and gate-green; confirm each per `LOTUS_TESTING.md`, then delete the row.
 
 | ID   | Item                                                                                                                                    | File / area                                                                | Test                                                                                                        |
-| :--- | :------------------------------------------------------------------------------------- | :--------------------------------------------------- | :-------------------------------------------------------------------------------- |
+| :--- | :-------------------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------- |
 | #2   | Chat-background animation flicker (`contain:paint`)                                                                                     | `lotus/chatBackground.ts`                                                  | F1                                                                                                          |
 | #4   | Ringtone re-fixes: classic loudness + caller decline notice (A2 ✓ live)                                                                 | `CallEmbedProvider.tsx`, `ringtones.ts`                                    | A1,A3,A4                                                                                                    |
 | #6   | Background vs. seasonal theme mutual exclusion                                                                                          | `state/settings.ts`, `General.tsx`                                         | F2                                                                                                          |
@@ -41,6 +41,7 @@ Implemented and gate-green; confirm each per `LOTUS_TESTING.md`, then delete the
 | AW-2 | Emoji lazy-load (search/autocomplete/recents fill in; board opens fast)                                                                 | `plugins/emoji.ts` + consumers                                             | first emoji-board open of a session: grid+search populate; reactions still label                            |
 | AW-3 | SW precache (repeat-visit near-instant; deploys still picked up immediately)                                                            | `sw.ts`, `vite.config.js`                                                  | load app twice (2nd = cached assets); deploy → reload picks new version                                     |
 | AW-4 | Desktop CSP tighten + Escape/panel fixes + thread Jump to Latest                                                                        | `tauri.conf.json`, Room/ThreadPanel                                        | desktop: boots, avatars/media load, VT323 font renders, location maps embed, calls connect, deep links work |
+| P3-4 | Accessibility compliance pass (collapsed-msg SR sender, form/overlay labels, typing announce, focus-return, `?` help, jsx-a11y CI gate) | `message/*`, `RoomViewTyping`, `features/shortcuts/*`, `eslint.config.mjs` | LOTUS_TESTING §P — axe-core + VoiceOver/NVDA on the golden path                                             |
 
 **Verified working in live testing (2026-06):** A2, B1–B4, C1, C3, D (mic/camera/deafen/screenshare/fullscreen/more-menu/PiP). Denoise quality in D is still poor — tracked under the denoise project, not a regression.
 
@@ -139,7 +140,7 @@ retry … AbortError: Restart delayed event timed out before the HS responded`,
 ### Security & Privacy
 
 - **N97 — Access token stored in plaintext `localStorage`** (`state/sessions.ts`), vulnerable to XSS; device ID likewise. Architectural — needs a token-protection / session-storage redesign.
-- **Session writes are non-atomic and not cross-tab synced** (`state/sessions.ts`) — risks inconsistent state / races across tabs.
+- ~~**Session writes are non-atomic and not cross-tab synced**~~ — **done (2026-07):** atomic single-key `cinny_session_v1` blob (legacy-key migration + dual-write) + `subscribeSessionChanges`/`useSessionSync` cross-tab reload. (The plaintext-token concern in N97 above is the remaining, separate architectural item.)
 - **Persisted PII without encryption:** user status message + expiry (`settings/account/Profile.tsx`), unsent composer drafts (`room/RoomInput.tsx`). Leak risk on shared devices.
 
 ### PWA / Offline / Notifications

LOTUS_E2EE_INVESTIGATION.md

@@ -18,7 +18,7 @@
 From the matrix infra README (`/root/code/matrix/README.md`):
 
 | Thing                    | Value                                                         |
-|-------|-------|
+| ------------------------ | ------------------------------------------------------------- |
 | Synapse host             | LXC **151**, `10.10.10.29` (Synapse 1.155.0)                  |
 | Synapse log              | `/var/log/matrix-synapse/homeserver.log`                      |
 | Synapse config           | `/etc/matrix-synapse/homeserver.yaml` (+ `conf.d/`)           |
@@ -86,6 +86,7 @@ use it as the primary client artifact and DevTools as the raw backup.
     /var/log/matrix-synapse/homeserver.log | grep "<user_id>"
   ```
 - **Synapse SQL (LXC 109) — what the server thinks it holds:**
+
   ```sql
   -- Current OTK inventory for the device (compare key_id set against the
   -- request body the client keeps retrying).
@@ -106,8 +107,10 @@ use it as the primary client artifact and DevTools as the raw backup.
   FROM e2e_fallback_keys_json
   WHERE user_id = '@user:matrix.lotusguild.org' AND device_id = '<DEVICE_ID>';
   ```
+
   > Table names are Synapse 1.155 (`e2e_one_time_keys_json`,
   > `e2e_fallback_keys_json`). If a name is absent, list with `\dt e2e*` in psql.
+
 - **Confirms:** if the offending `key_id` (from the 400) is **present** in
   `e2e_one_time_keys_json` with a **different** stored value than the client's
   request body → OTK state has diverged (rust-crypto store vs Synapse). That is
@@ -132,6 +135,7 @@ use it as the primary client artifact and DevTools as the raw backup.
     /var/log/matrix-synapse/homeserver.log | grep -E "<user_id>|<participant_id>"
   ```
 - **Synapse SQL (LXC 109) — undelivered / queued to-device events:**
+
   ```sql
   -- Backlog of to-device messages queued for the affected device. A growing
   -- count here = the HS has the media-key events but the device isn't draining
@@ -145,6 +149,7 @@ use it as the primary client artifact and DevTools as the raw backup.
   SELECT device_id, display_name, last_seen, ts
   FROM devices WHERE user_id = '@user:matrix.lotusguild.org';
   ```
+
 - **Confirms:** to-device events present but undecryptable (client shows the
   `io.element.call.encryption_keys` "unexpected encrypted" warning) ⇒ there is
   **no valid Olm session** to decrypt them — the expected downstream of KE-1.
@@ -265,7 +270,7 @@ Q4. KE-4: do delayed-event timeouts coincide with Synapse p99 latency spikes
 > "fix" before the planning session** — they are listed so evidence collection
 > can be paired with a recovery plan. Confirm the root condition (Q1/Q2) first.
 
-1. **Per-device logout + re-login of the affected device** *(lowest blast radius)*
+1. **Per-device logout + re-login of the affected device** _(lowest blast radius)_
    - **What:** log the one glitching device out and back in. Forces a fresh
      device id, fresh device keys, and a clean OTK batch — sidesteps a diverged
      OTK store without touching other sessions.
@@ -275,7 +280,7 @@ Q4. KE-4: do delayed-event timeouts coincide with Synapse p99 latency spikes
    - **Confirms/uses:** if KE-1 stops after this, OTK-store divergence (Q1) was
      the cause.
 
-2. **Client crypto-store reset (`clearLoginData` path)** *(medium)*
+2. **Client crypto-store reset (`clearLoginData` path)** _(medium)_
    - **What:** `clearLoginData()` in `src/client/initMatrix.ts` (coordinator's
      file — do not edit) **deletes ALL IndexedDB databases** (incl.
      `web-sync-store` and the rust-crypto store `crypto-store`), **unregisters
@@ -294,16 +299,16 @@ Q4. KE-4: do delayed-event timeouts coincide with Synapse p99 latency spikes
    - **Use when:** the rust-crypto store itself is corrupt/diverged and option 1
      didn't clear it.
 
-3. **SDK pin change off the RC** *(medium — codebase change, needs rebuild)*
+3. **SDK pin change off the RC** _(medium — codebase change, needs rebuild)_
    - **Current pin:** `package.json` → `"matrix-js-sdk": "41.6.0-rc.0"` (a
      release candidate).
    - **Finding (npm / GitHub changelog, checked 2026-07):** stable **`41.6.0`**
-     was released **2026-05-26**. Its only changelog line is *"Throw sane error
-     on completeLoginOnNewDevice IdP rejection"* — **no OTK / keys-upload / Olm /
+     was released **2026-05-26**. Its only changelog line is _"Throw sane error
+     on completeLoginOnNewDevice IdP rejection"_ — **no OTK / keys-upload / Olm /
      to-device fix** relative to the RC. Later stable lines exist
      (`41.7.0`, `41.8.0`; `41.7.0-rc.3` / `41.9.0-rc.0` seen as pre-releases).
-     Nearby crypto-relevant entries: `41.5.0` *"Enable encrypted history sharing
-     by default"*; `41.4.0` key-backup handling. **No changelog entry directly
+     Nearby crypto-relevant entries: `41.5.0` _"Enable encrypted history sharing
+     by default"_; `41.4.0` key-backup handling. **No changelog entry directly
      addresses the KE-1 OTK-conflict symptom** in the immediate range — so
      moving RC→`41.6.0` stable is a low-risk hygiene step but is **not expected
      to fix KE-1 by itself**. Before pinning, re-read the CHANGELOG for any
@@ -312,7 +317,7 @@ Q4. KE-4: do delayed-event timeouts coincide with Synapse p99 latency spikes
      rust-crypto IndexedDB schema — a downgrade triggers the `IDB_VERSION_CONFLICT`
      path in `initMatrix.ts`.
 
-4. **Synapse-side OTK row surgery** *(LAST RESORT — highest danger)*
+4. **Synapse-side OTK row surgery** _(LAST RESORT — highest danger)_
    - **What:** deleting/rewriting rows in `e2e_one_time_keys_json` (and/or
      `e2e_fallback_keys_json`, `device_inbox`) for the affected device to force
      the client to re-upload a clean batch.

LOTUS_FEATURES.md

@@ -1179,6 +1179,18 @@ Three one-tap presets at the top of **Settings → Notifications** that apply a
 
 ---
 
+## Accessibility (P3-4)
+
+WCAG 2.1 AA hardening of the golden path (find room → read → reply → send) for keyboard and screen-reader users.
+
+- **Timeline for screen readers:** each message is `role="article"`; **collapsed messages announce their sender + time** (they drop the visible header, so AT would otherwise hear the body with no attribution). The timeline is a `role="log"` `aria-live="polite"` region so new messages are announced; emoji/emoticons carry text labels.
+- **Live status:** typing indicators announce via a `role="status"` region; editing a message announces "Editing message from <sender>".
+- **Forms & overlays:** all inputs have associated labels (visible `<label htmlFor>` or `aria-label`); the Media Gallery and Search overlays are named.
+- **Focus management:** skip-to-content link + `nav`/`main` landmarks; genuine dialogs return focus to their trigger on close (inline popouts intentionally keep focus in context).
+- **Keyboard-shortcuts help:** press <kbd>?</kbd> for a dialog of the existing shortcuts (Escape, type-to-focus composer, Enter/Shift+Enter send, message actions).
+- **Regression gate:** a curated `eslint-plugin-jsx-a11y` rule set (ARIA correctness + label association) runs in CI. Files: `components/message/*`, `features/room/RoomViewTyping.tsx`, `features/shortcuts/*`, `utils/a11y.ts`, `eslint.config.mjs`.
+- _Known limitation:_ list virtualization keeps far-scrolled history out of the a11y tree (perf trade-off); newly-arriving messages are announced.
+
 ## Infrastructure
 
 ### Authenticated Media

LOTUS_TESTING.md

@@ -1,6 +1,6 @@
 # Lotus Chat — Manual Testing Guide
 
-**Generated:** June 2026
+**Generated:** June 2026 · **Updated:** July 2026 (added §O — threads, per-thread notifications, math, search cache, session hardening, audit wave, desktop CSP)
 **Scope:** Everything landed on the `lotus` branch since the v4.12.3 merge that I (Claude) could **not** verify statically and that needs a human in a real environment to confirm. Work through it top-to-bottom; the highest-risk / hardest-to-reproduce items are first.
 
 > **How to report back:** For each numbered check, tell me **PASS** / **FAIL** (or **partial**). On any FAIL, include: what you saw vs. expected, the browser/OS (and whether web LXC 106 or the desktop/Tauri build), the theme you were on, and any **browser console** errors (F12 → Console). Screenshots help for anything visual.
@@ -573,10 +573,100 @@ Log into **matrix.lotusguild.org** (password) and **matrix.org**.
 
 ---
 
+## O. July 2026 batch — threads, notifications, math, search cache, audit wave
+
+Everything landed after the OIDC work. These mirror the checklists in `LOTUS_TODO.md` (§P3-8, §P4-1) and the Needs-Verification rows in `LOTUS_BUGS.md` (P3-8/P4-1/P4-4/P4-8/N97a/AW-1…4). **⚠️ Threads change the main timeline** — thread replies no longer render inline; that's intended (see O1).
+
+### O1. Thread Panel (P3-8) — 👥 2 people help for live replies
+
+1. Hover a message → **Reply in Thread** (message menu). The right-side **thread panel** opens with that message as the root.
+2. Send text, an emoji, and a file upload into the thread; have the second person reply too.
+3. Reply to a reply _inside_ the panel.
+
+**Expected:** the panel shows the root at top + an "N replies" divider + the reply timeline (own composer at the bottom). Your sends appear immediately (pending → confirmed). A reply-to-a-reply is a proper thread reply. In the **main** timeline the replies do **not** appear inline — the root message instead shows a **"N replies · time"** chip. Clicking the chip (or a reply's thread indicator) opens the panel. **×** or **Escape** closes it; on mobile the panel is fullscreen. Scrolled up in a long thread → a **Jump to Latest** chip appears. Reload the page → the root/reply split persists; in an **encrypted** room the thread replies decrypt (not "Unable to decrypt").
+
+### O2. Per-thread notifications (P4-1, Slack-style) — 👥 2 people
+
+1. Have the second person reply in a thread **you have posted in** → expect a notification + sound.
+2. Have them reply in a thread **you have never touched** and don't @mention you → expect **silence** (only the chip's unread badge updates).
+3. Have them **@mention** you in any thread → expect a notification regardless of participation.
+4. Open the panel's **bell menu** (header) → set the thread to **Mute** → expect no notifications, the chip's unread badge gone (bell-mute glyph shown), and the room's **sidebar badge drops** by that thread's count. Try **All** (every reply notifies) and **Mentions only** (only @mentions).
+5. On a **second device**, confirm the same per-thread modes are set (they sync via account data).
+6. Room-level **Mute** (room context menu) still silences everything, including thread overrides.
+
+**Known caveat:** Mentions-only can under-notify in E2EE rooms (the decision runs before decryption). Muted-thread badge subtraction is Lotus-only.
+
+### O3. Math / LaTeX (P4-4)
+
+Send each and confirm rendering: `$x^2 + y^2$` (inline), `$$\int_0^1 f(x)\,dx$$` (block, centered), `$5 and $10 for lunch` (**stays plain text** — currency guard), and a code block containing `$x$` (**stays literal** inside the code block). **Expected:** the first two render as math (KaTeX); the last two are untouched. First math of the session may show the raw `$…$` for a beat while the KaTeX chunk lazy-loads, then renders.
+
+### O4. Encrypted search cache (P4-8) — opt-in
+
+In an **encrypted** room's message search, enable **"Persist search index on this device"** (Encrypted Rooms panel). Search, then **reload** and search the same term. **Expected:** coverage survives the reload (results without re-paginating everything). **Clear cached index** empties it. **Log out** → the cache is wiped (privacy). Toggling the setting OFF does **not** wipe (only Clear/logout do).
+
+### O5. Session hardening (N97a) — cross-tab
+
+1. Log in on a build that predates the change, then load this build → you stay logged in (legacy keys migrate to the `cinny_session_v1` blob; check DevTools → Application → Local Storage).
+2. Open the app in **two tabs**; **log out** in tab A → tab B reloads to the auth screen within a moment. Log in again in one tab → the other reloads too.
+
+### O6. Audit-wave correctness fixes (AW-1)
+
+- **Scheduled-message cancel:** schedule a message, then cancel it **with the network cut** (DevTools offline) → the item **stays** with an inline error (it does **not** silently disappear and still send). Restore network, retry → cancels cleanly.
+- **Escape coordination:** in a thread panel, open the mention autocomplete or set a reply draft, press **Escape** → it dismisses the autocomplete/reply **without** closing the panel. A bare Escape (nothing to dismiss) still marks the room read / closes the panel as before.
+- **Panel exclusivity:** on mobile, opening a thread while the media gallery (or members drawer) is open shows only **one** right panel (thread wins), not stacked fullscreen overlays.
+- **Emoji board (AW-2):** the **first** time you open the emoji board / autocomplete in a session, the grid **and search** populate with unicode emoji (they don't stay empty). Reactions still show a label.
+
+### O7. Desktop (Tauri) — CSP tighten + native stack (AW-4) — 🖥️ desktop build only
+
+The webview CSP was tightened and the full native module set now compiles. Smoke-test the desktop build:
+
+1. App **boots**, avatars + media thumbnails load, the **VT323** terminal font renders (Lotus Terminal theme), a **location message** embeds its OpenStreetMap map, **calls** connect (EC iframe), **deep links** (`matrix:` / clicking a room link) navigate.
+2. **Native features:** minimize to tray (notifications still arrive), a message notification is a **rich toast** (click opens the room; reply box sends), the taskbar **Jump List** lists recent rooms, in a call the taskbar thumbnail shows **Mute/Deafen/End**, Windows **Focus Assist** silences Lotus.
+3. **Console** (desktop devtools) shows **no CSP violations** during normal use. If something visual/media is blocked, that's the CSP to loosen — note exactly what and where.
+
+### O8. E2EE / call-key cluster (KE-1→4) — 👥 2 people, during a real call
+
+We shipped the diagnostics kit + a **Crypto Diagnostics** card (**Settings → Developer Tools**). During your next call that glitches (audio cutouts, "Unable to decrypt"), open it and **Download report**, and note whether the symptoms even still occur now that we're on **matrix-js-sdk 41.7.0** (crypto-wasm 18.3.1). Send me the report + `LOTUS_E2EE_INVESTIGATION.md` is the runbook.
+
+---
+
+## P. Accessibility (P3-4) — needs a browser + a screen reader
+
+The compliance fixes are gate-verified in code; these confirm the runtime a11y behavior only a human + AT can check. Tools: browser DevTools "axe" extension / Lighthouse a11y, plus **VoiceOver** (macOS ⌘F5) or **NVDA** (Windows).
+
+### P1. Keyboard-only golden path (no mouse)
+
+Tab from page load: **skip-to-content** link appears first (Enter jumps to the timeline). Tab reaches the room list (rooms are focusable, active room announced), open a room (Enter), type a character → focus lands in the composer, send with Enter (or Shift+Enter per your `enterForNewline` setting). No keyboard trap; visible focus ring throughout.
+
+### P2. `?` shortcuts dialog
+
+Press **?** (Shift+/) with focus NOT in a text field → the keyboard-shortcuts dialog opens, is focus-trapped, Escape closes it and focus returns to where you were. Pressing `?` while typing in the composer/search inserts a literal `?` (does NOT open the dialog).
+
+### P3. Screen-reader: reading messages
+
+With VoiceOver/NVDA on, arrow through the timeline: each message is announced as an article with **sender name + time** — critically, this includes **collapsed messages** (consecutive messages from the same person), which previously announced only the body with no sender. Reactions, "edited", replies, and delivery status are announced with labels.
+
+### P4. Screen-reader: live announcements
+
+- **New message** arrives while you're reading → announced (polite).
+- **Someone starts typing** → "X is typing" announced once (not spammed per keystroke).
+- **Editing a message** → the edit box announces "Editing message from X".
+
+### P5. Focus return from dialogs
+
+Open then close (Escape or ×): the **room topic viewer**, a **reaction viewer** (click a reaction count), and **Search** → focus returns to the button/element you opened them from (not lost to `<body>`). Inline popouts (emoji picker, autocomplete, hover menus) intentionally keep focus in context — that's expected, not a bug.
+
+### P6. axe / Lighthouse scan
+
+Run the axe DevTools extension (or Lighthouse → Accessibility) on a room view, Settings, and the login screen. Expect **no critical/serious** "missing accessible name" or "ARIA" violations on the golden path. Report any that appear (note: far-scrolled timeline history being virtualized out is a known, accepted limitation — not a finding).
+
+---
+
 ## Priority if you're short on time
 
-1. **A4** (in-call banner) + **A3** (ringtone) — newest, most logic, hardest to reproduce.
-2. **B1–B3** (polls on a default theme) — the confirmed visual bug.
-3. **D** (EC 0.20.1 control sweep) — guards against the upstream merge breaking calls.
-4. **A7** false-positive check (normal joins don't show the error overlay).
-5. Everything else.
+1. **O1 + O2** (threads + per-thread notifications) — the largest new surface; the main-timeline change is user-visible.
+2. **O7** (desktop CSP smoke) — CI can't catch CSP breakage; a wrong directive silently breaks media/fonts/maps.
+3. **O5** (session cross-tab) + **O6** (scheduled-cancel ghost-send) — auth-critical + a real data-loss-class fix.
+4. **A4** (in-call banner) + **A3** (ringtone) — newest call logic, hardest to reproduce.
+5. **D** (EC control sweep) — guards against the fork breaking calls.
+6. Everything else.

LOTUS_TODO.md

@@ -141,7 +141,12 @@ Status: `[ ]` pending · `[~]` in progress · `[x]` completed
 
 ## Priority 3 — Higher complexity / lower daily frequency
 
-### [ ] P3-4 · Accessibility Improvements (WCAG 2.1 AA)
+### [~] P3-4 · Accessibility Improvements (WCAG 2.1 AA) — COMPLIANCE PASS DONE (2026-07), ⚠️ AWAITING LIVE AXE/SR AUDIT
+
+**Shipped (compliance + shortcuts-help tier):** messages `role="article"` + collapsed-message sender/time announced to AT (the biggest gap — collapsed rows had no sender for a screen reader); ~10 unlabeled form inputs + Media Gallery / Search overlays named; emoji/emoticon aria-labels; typing indicator now announced via a `role="status"` live region; editing a message announces "Editing message from X"; focus now returns to the trigger on close of 4 genuine dialogs (RoomIntro/Reactions/RoomViewHeader-topic/Search — inline popouts correctly left); a `?` keyboard-shortcuts help dialog; and a **jsx-a11y lint gate** (curated ARIA-correctness + label rules, enforced in CI) to prevent regressions. Already-good before this pass: skip link + landmarks, timeline `role="log"`/`aria-live`, ~99% icon-button labels, labeled editor.
+**DEFERRED (documented):** virtualization keeps scrolled-away history out of the a11y tree (architectural; the live-region announces newly-arriving messages) — not re-architected to avoid perf regression; roving-tabindex + command palette + section-jump shortcuts (user-deferred); the live axe-core / VoiceOver+NVDA audit → LOTUS_TESTING §P.
+
+_Original scope (for reference):_
 
 **What:** Comprehensive audit and fix pass targeting the critical user paths:
 
@@ -167,6 +172,7 @@ Status: `[ ]` pending · `[~]` in progress · `[x]` completed
 Built per the design below (4-agent build + 2-agent review). Gates green (tsc/eslint/build/tests). **Release note: threaded replies no longer render inline in the main timeline — roots show a "N replies" chip that opens the panel.**
 
 **Manual QA checklist (post-deploy):**
+
 1. Reply in Thread (message menu) → panel opens; send text/upload/emoji into it (appears pending → confirmed)
 2. Reply to a reply inside the panel → event carries `m.thread` + `m.in_reply_to` with `is_falling_back:false`
 3. Main timeline: root + chip only (replies absent); chip count/time updates live; unread badge appears for others' thread replies and clears after viewing the panel
@@ -209,16 +215,16 @@ Features:
 **What:** Replace the manual "load more" button with an automated, virtualized infinite scroll for search results.  
 **Status:** Done in a prior session — `MessageSearch.tsx` already uses `useVirtualizer` (~line 336) over the result groups AND auto-fetches the `nextToken` page when the last virtual item scrolls into view (~line 469) via `useInfiniteQuery`. Nothing left to build.
 
-### [ ] P4-8 · Encrypted Message Search Indexing & Caching
+### [~] P4-8 · Encrypted Message Search Indexing & Caching — IMPLEMENTED (2026-07), opt-in
 
-**What:** Implement a persistent local cache for search results, optimized for encrypted rooms.  
-**Approach:** Use `IndexedDB` to store search metadata (event IDs, timestamps) to prevent redundant server-side decryption/fetching.
+**Shipped:** `src/app/utils/searchCache.ts` — raw-IndexedDB per-room index (`lotus-search-cache`) of decrypted search rows + coverage markers, merged into local search (in-memory-wins dedupe). **Opt-in, default OFF** (stores plaintext at rest) with a privacy note, Clear button, and logout wipe. Awaiting live QA (LOTUS_BUGS AW / P4-8 row).
 
 ### [~] P4-1 · Thread Notification Mode Per-Thread — IMPLEMENTED (2026-07), ⚠️ AWAITING LIVE QA
 
 **Shipped (Slack-style):** default = **Participating** (notified only for threads you've posted in or where you're @mentioned); per-thread override **All / Mentions-only / Mute** via the bell menu in the thread panel header; modes sync across devices (`io.lotus.thread_notifications` account data, pruned on write). Mute also suppresses the chip badge and subtracts the thread from the room's sidebar badge (client-side). Also fixed the underlying path: thread replies are notified via exactly one handler (room-level `ThreadEvent.NewReply`), with the main-timeline notifier + unread binder thread-guarded, and live badge refresh on `RoomEvent.UnreadNotifications`.
 
 **Manual QA checklist (post-deploy):**
+
 1. Friend replies in a thread YOU posted in → notification + sound; in a thread you never touched → silent (chip badge only)
 2. @mention in any thread → notified regardless of participation
 3. Set a thread to Mute → no notifications, chip badge gone (bell-mute glyph), room sidebar badge drops by that thread's count
@@ -418,10 +424,11 @@ Features:
 **Decision:** Deferred (reviewed 2026-07). Multi-sprint, and it touches the auth/crypto/storage core — not worth the risk/effort for a niche need right now. Kept here with a concrete spec so it's actionable later.
 
 **Future-work spec (why it's big):** the app is currently **single-session**.
+
 - Session lives in `src/app/state/sessions.ts` under fixed localStorage keys — `cinny_access_token`, `cinny_device_id`, `cinny_user_id`, `cinny_hs_base_url`, plus the OIDC keys (`cinny_refresh_token`, `cinny_expires_at`, `cinny_oidc_*`).
 - Persistence lives in `src/client/initMatrix.ts`: two fixed IndexedDB stores — `web-sync-store` (`IndexedDBStore`) and `crypto-store` (`IndexedDBCryptoStore`) — feeding one `createClient(...)`.
 
-True per-context isolation would require: (1) namespace every localStorage key per context (`ctx:<id>:cinny_*`); (2) per-context IndexedDB dbNames for **both** the sync store and the crypto store; (3) a context registry + switcher UI (create/rename/delete/switch); (4) full client teardown + re-init on switch (`initMatrix` currently assumes one global client); (5) per-context settings + notification/quiet-hours state; (6) careful crypto-store isolation so device keys never bleed across contexts. **Smaller intermediate step** if demand appears: plain multi-account (fast account switch) *without* the hard isolation boundary — much less risky, reuses most of the login flow.  
+True per-context isolation would require: (1) namespace every localStorage key per context (`ctx:<id>:cinny_*`); (2) per-context IndexedDB dbNames for **both** the sync store and the crypto store; (3) a context registry + switcher UI (create/rename/delete/switch); (4) full client teardown + re-init on switch (`initMatrix` currently assumes one global client); (5) per-context settings + notification/quiet-hours state; (6) careful crypto-store isolation so device keys never bleed across contexts. **Smaller intermediate step** if demand appears: plain multi-account (fast account switch) _without_ the hard isolation boundary — much less risky, reuses most of the login flow.  
 **Priority:** Extreme Low (Multi-sprint/Architectural).
 
 ### [DROPPED] P5-52 · Desktop — Room-Level Sync Governor (Performance Control)
@@ -511,7 +518,7 @@ Exhaustive, low-level implementation details for backlog items. Follow these pat
 **Decisions (each backed by SDK evidence in node_modules/matrix-js-sdk):**
 
 | Question         | Decision                                                                                                                                                                                                                                                                                                                                                                                                                             |
-|---|---|
+| ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | Thread rendering | **New lean `ThreadTimeline`** reusing `Message`, `useVirtualPaginator`, and RoomTimeline's exported timeline helpers (lines 156-227). Do NOT refactor 2214-line RoomTimeline (its ~35 hooks are hardwired to the room live timeline).                                                                                                                                                                                                |
 | threadSupport    | **Enable `threadSupport: true`** in `initMatrix.ts` (~line 39). ⚠️ Thread replies then LEAVE the main timeline (`room.js eventShouldLiveIn` → `shouldLiveInRoom:false`), retroactively on reload — MUST ship the "N replies" summary chip in the same release. Roots stay in both timelines.                                                                                                                                         |
 | State            | `roomIdToActiveThreadIdAtomFamily` (per-room, mirrors `roomIdToReplyDraftAtomFamily`) in new `state/room/thread.ts` + `getThreadDraftKey(roomId, threadRootId)` = `` `${roomId}::${threadRootId}` ``                                                                                                                                                                                                                                 |
@@ -520,10 +527,12 @@ Exhaustive, low-level implementation details for backlog items. Follow these pat
 | Mobile           | Pure CSS like `MembersDrawer.css.ts`: fixed width toRem(360) desktop, `position:fixed; inset:0` under 750px.                                                                                                                                                                                                                                                                                                                         |
 
 **Critical side-effect fixes (one-liners, land FIRST):**
+
 1. `initMatrix.ts` → `threadSupport: true`.
 2. `utils/notifications.ts:24` → `sendReadReceipt(latestEvent, type, /*unthreaded*/ true)` — otherwise markAsRead becomes `main`-scoped and room badges stick permanently unread (room unread total includes thread counts).
 
 **Known SDK traps (verified):**
+
 - **Local echo gap:** chronological pending ordering means the thread timelineSet never receives pending events (`canContain` rejects; `room.getPendingEvents()` THROWS in this mode) — ThreadTimeline must render its own pending strip via `RoomEvent.LocalEchoUpdated` filtering on `threadRootId`, deduped against `thread.findEventById`.
 - **Bootstrap:** `room.getThread(id) ?? room.createThread(id, room.findEventById(id), [], false)` — the SDK auto-fetches via `/relations` and inserts the root at top; gate rendering on `thread.initialEventsFetched`; decrypt with `decryptAllTimelineEvent` after init + each pagination.
 - **Deep links:** `getEventTimeline(mainSet, threadEventId)` returns undefined for thread events — redirect jump-to-event to the panel (best-effort v1).

dev/oidc-test/synapse-msc3861.yaml

@@ -5,11 +5,11 @@ experimental_features:
   msc3861:
     enabled: true
     issuer: http://localhost:8090/
-    client_id: "0000000000000000000SYNAPSE"
+    client_id: '0000000000000000000SYNAPSE'
     client_auth_method: client_secret_basic
-    client_secret: "REPLACE_WITH_A_SHARED_CLIENT_SECRET"
-    admin_token: "REPLACE_WITH_A_LONG_SHARED_ADMIN_TOKEN"
-    account_management_url: "http://localhost:8090/account"
+    client_secret: 'REPLACE_WITH_A_SHARED_CLIENT_SECRET'
+    admin_token: 'REPLACE_WITH_A_LONG_SHARED_ADMIN_TOKEN'
+    account_management_url: 'http://localhost:8090/account'
 
 # With msc3861 enabled, Synapse disables its own password/SSO login and advertises
 # `m.authentication` in /.well-known/matrix/client — which is exactly what the

eslint.config.mjs

@@ -25,7 +25,7 @@ export default [
   tsPlugin.configs['flat/eslint-recommended'],
   ...tsPlugin.configs['flat/recommended'],
   reactPlugin.configs.flat.recommended,
-  reactHooksPlugin.configs.flat['recommended'],
+  reactHooksPlugin.configs.flat.recommended,
   // Register jsx-a11y plugin (rules selectively enabled below)
   { plugins: { 'jsx-a11y': jsxA11yPlugin } },
   // airbnb-base via FlatCompat (JS/import rules; no React plugin, no getFilename issue)
@@ -115,6 +115,26 @@ export default [
       'jsx-a11y/media-has-caption': 'off',
       'jsx-a11y/no-noninteractive-element-interactions': 'off',
       'jsx-a11y/alt-text': 'off',
+      // A11y regression gate (P3-4). A CURATED set — correctness rules that catch
+      // real WCAG gaps (missing accessible names, malformed ARIA) without
+      // flooding on the pre-existing clickable-div patterns. The heavier
+      // interaction rules (no-static-element-interactions,
+      // click-events-have-key-events) are a separate cleanup and stay OFF.
+      'jsx-a11y/aria-props': 'error',
+      'jsx-a11y/aria-proptypes': 'error',
+      'jsx-a11y/aria-role': ['error', { ignoreNonDOM: true }],
+      'jsx-a11y/aria-unsupported-elements': 'error',
+      'jsx-a11y/role-has-required-aria-props': 'error',
+      'jsx-a11y/role-supports-aria-props': 'error',
+      'jsx-a11y/no-redundant-roles': 'error',
+      'jsx-a11y/anchor-has-content': 'error',
+      'jsx-a11y/heading-has-content': 'error',
+      'jsx-a11y/label-has-associated-control': ['error', { assert: 'either', depth: 5 }],
+      // NOT enabled: control-has-associated-label. This repo labels most inputs
+      // with folds `<Text as="label" htmlFor>` — a component the rule's static
+      // analysis can't see as a <label>, producing false positives on correctly
+      // labeled controls. The genuinely-unlabeled controls it surfaced (sliders,
+      // file input, media players, notes) were fixed directly with aria-label.
     },
   },
   {
@@ -123,4 +143,11 @@ export default [
       'no-undef': 'off',
     },
   },
+  {
+    // Test files commonly define several small mock/fake classes.
+    files: ['**/*.test.ts', '**/*.test.tsx'],
+    rules: {
+      'max-classes-per-file': 'off',
+    },
+  },
 ];

src/app/components/AccountDataEditor.tsx

@@ -213,6 +213,7 @@ function AccountDataView({ type, defaultContent, onEdit }: AccountDataViewProps)
           <Text size="L400">Account Data</Text>
           <Input
             variant="SurfaceVariant"
+            aria-label="Account data type"
             size="400"
             radii="300"
             readOnly

src/app/components/VoiceMessageRecorder.tsx

@@ -282,7 +282,12 @@ export function VoiceMessageRecorder({ onSend, onError }: VoiceRecorderProps) {
     >
       {previewUrl && (
         <>
-          <audio ref={previewAudioRef} src={previewUrl} onEnded={() => setPreviewPlaying(false)} />
+          <audio
+            ref={previewAudioRef}
+            src={previewUrl}
+            onEnded={() => setPreviewPlaying(false)}
+            aria-hidden="true"
+          />
           <IconButton
             onClick={() => {
               const audio = previewAudioRef.current;

src/app/components/create-room/CreateRoomAliasInput.tsx

@@ -78,11 +78,14 @@ export function CreateRoomAliasInput({ disabled }: { disabled?: boolean }) {
 
   return (
     <Box shrink="No" direction="Column" gap="100">
-      <Text size="L400">Address (Optional)</Text>
+      <Text as="label" htmlFor="create-room-alias" size="L400">
+        Address (Optional)
+      </Text>
       <Text size="T200" priority="300">
         Pick an unique address to make it discoverable.
       </Text>
       <Input
+        id="create-room-alias"
         ref={aliasInputRef}
         onChange={handleAliasChange}
         before={

src/app/components/editor/Editor.tsx

@@ -66,6 +66,8 @@ type CustomEditorProps = {
   maxHeight?: string;
   editor: Editor;
   placeholder?: string;
+  /** Explicit accessible name for the textbox; falls back to the placeholder. */
+  ariaLabel?: string;
   onKeyDown?: KeyboardEventHandler;
   onKeyUp?: KeyboardEventHandler;
   onChange?: EditorChangeHandler;
@@ -82,6 +84,7 @@ export const CustomEditor = forwardRef<HTMLDivElement, CustomEditorProps>(
       maxHeight = '50vh',
       editor,
       placeholder,
+      ariaLabel,
       onKeyDown,
       onKeyUp,
       onChange,
@@ -139,7 +142,7 @@ export const CustomEditor = forwardRef<HTMLDivElement, CustomEditorProps>(
                 data-editable-name={editableName}
                 className={css.EditorTextarea}
                 placeholder={placeholder}
-                aria-label={placeholder ?? 'Message input'}
+                aria-label={ariaLabel ?? placeholder ?? 'Message input'}
                 aria-multiline="true"
                 renderPlaceholder={renderPlaceholder}
                 renderElement={renderElement}

src/app/components/image-pack-view/PackMeta.tsx

@@ -200,12 +200,24 @@ export function ImagePackProfileEdit({ meta, onCancel, onSave }: ImagePackProfil
         </Box>
       </Box>
       <Box direction="Inherit" gap="100">
-        <Text size="L400">Name</Text>
-        <Input name="nameInput" defaultValue={meta.name} variant="Secondary" radii="300" required />
+        <Text as="label" htmlFor="image-pack-name" size="L400">
+          Name
+        </Text>
+        <Input
+          id="image-pack-name"
+          name="nameInput"
+          defaultValue={meta.name}
+          variant="Secondary"
+          radii="300"
+          required
+        />
       </Box>
       <Box direction="Inherit" gap="100">
-        <Text size="L400">Attribution</Text>
+        <Text as="label" htmlFor="image-pack-attribution" size="L400">
+          Attribution
+        </Text>
         <TextArea
+          id="image-pack-attribution"
           name="attributionTextArea"
           defaultValue={meta.attribution}
           variant="Secondary"

src/app/components/invite-user-prompt/InviteUserPrompt.tsx

@@ -261,9 +261,12 @@ export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
                 gap="400"
               >
                 <Box direction="Column" gap="100">
-                  <Text size="L400">User ID</Text>
+                  <Text as="label" htmlFor="invite-user-id" size="L400">
+                    User ID
+                  </Text>
                   <div>
                     <Input
+                      id="invite-user-id"
                       size="500"
                       ref={inputRef}
                       onChange={handleSearchChange}
@@ -334,8 +337,11 @@ export function InviteUserPrompt({ room, requestClose }: InviteUserProps) {
                   </div>
                 </Box>
                 <Box direction="Column" gap="100">
-                  <Text size="L400">Reason (Optional)</Text>
+                  <Text as="label" htmlFor="invite-reason" size="L400">
+                    Reason (Optional)
+                  </Text>
                   <TextArea
+                    id="invite-reason"
                     size="500"
                     name="reasonInput"
                     variant="Background"

src/app/components/join-address-prompt/JoinAddressPrompt.tsx

@@ -108,8 +108,11 @@ export function JoinAddressPrompt({ onOpen, onCancel }: JoinAddressProps) {
                 </Text>
               </Box>
               <Box direction="Column" gap="100">
-                <Text size="L400">Address</Text>
+                <Text as="label" htmlFor="join-address" size="L400">
+                  Address
+                </Text>
                 <Input
+                  id="join-address"
                   size="500"
                   autoFocus
                   name="addressInput"

src/app/components/page/style.css.ts

@@ -117,7 +117,6 @@ export const PageHeroSection = style([
   },
 ]);
 
-
 export const PageContentCenter = style([
   DefaultReset,
   {

src/app/components/room-intro/RoomIntro.tsx

@@ -95,7 +95,6 @@ export const RoomIntro = as<'div', RoomIntroProps>(({ room, ...props }, ref) =>
                     <FocusTrap
                       focusTrapOptions={{
                         initialFocus: false,
-                        returnFocusOnDeactivate: false,
                         clickOutsideDeactivates: true,
                         onDeactivate: () => setViewTopic(false),
                         escapeDeactivates: stopPropagation,

src/app/components/soundboard-pack-view/SoundboardPackEditor.tsx

@@ -278,6 +278,7 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
     <Box direction="Column" gap="300">
       <input
         ref={fileInputRef}
+        aria-label="Upload soundboard clip"
         type="file"
         accept={SOUNDBOARD_ACCEPT}
         multiple

src/app/components/upload-card/UploadCardRenderer.tsx

@@ -56,6 +56,7 @@ function PreviewVideo({ fileItem }: PreviewVideoProps) {
 
   return (
     <video
+      aria-label="Video attachment preview"
       style={{
         objectFit: 'contain',
         width: '100%',

src/app/components/user-profile/UserModeration.tsx

@@ -260,6 +260,7 @@ export function UserModeration({ userId, canKick, canBan, canInvite }: UserModer
           <Input
             ref={reasonInputRef}
             placeholder="Reason"
+            aria-label="Moderation reason"
             size="300"
             variant="Background"
             radii="300"

src/app/components/user-profile/UserRoomProfile.tsx

@@ -253,6 +253,7 @@ function UserPrivateNotes({ userId }: { userId: string }) {
         )}
       </Box>
       <textarea
+        aria-label="Private note about this user"
         value={draft}
         onChange={handleChange}
         maxLength={USER_NOTE_MAX_LENGTH}

src/app/features/common-settings/permissions/PowersEditor.tsx

@@ -147,6 +147,7 @@ function EditPower({ maxPower, power, tag, onSave, onClose }: EditPowerProps) {
             <Text size="L400">Name</Text>
             <Input
               name="nameInput"
+              aria-label="Power level name"
               defaultValue={tag?.name}
               placeholder="Bot"
               size="300"
@@ -160,6 +161,7 @@ function EditPower({ maxPower, power, tag, onSave, onClose }: EditPowerProps) {
             <Input
               defaultValue={power}
               name="powerInput"
+              aria-label="Power level value"
               size="300"
               variant={typeof power === 'number' ? 'SurfaceVariant' : 'Secondary'}
               radii="300"

src/app/features/room/MediaGallery.tsx

@@ -186,8 +186,8 @@ function LightboxMedia({
       )}
       {media.status === 'ok' &&
         (item.msgtype === MsgType.Video ? (
-          // eslint-disable-next-line jsx-a11y/media-has-caption
           <video
+            aria-label="Video attachment"
             src={media.url}
             controls
             autoPlay
@@ -261,7 +261,6 @@ function Lightbox({
           escapeDeactivates: false,
         }}
       >
-        {/* eslint-disable-next-line jsx-a11y/no-static-element-interactions */}
         <div
           role="dialog"
           aria-modal
@@ -640,13 +639,15 @@ export function MediaGallery({ room, onClose }: MediaGalleryProps) {
         className={classNames(css.MediaGalleryDrawer, ContainerColor({ variant: 'Background' }))}
         shrink="No"
         direction="Column"
+        role="region"
+        aria-labelledby="media-gallery-title"
       >
         {/* Header */}
         <Header variant="Background" size="600" className={css.MediaGalleryHeader}>
           <Box grow="Yes" alignItems="Center" gap="200">
             <Icon size="200" src={Icons.Photo} />
             <Box grow="Yes">
-              <Text size="H4" truncate>
+              <Text id="media-gallery-title" size="H4" truncate>
                 Media Gallery
               </Text>
             </Box>

src/app/features/room/PollCreator.tsx

@@ -142,7 +142,6 @@ export function PollCreator({ roomId, onClose }: PollCreatorProps) {
                   placeholder="Ask a question…"
                   value={question}
                   onChange={(e: React.ChangeEvent<HTMLInputElement>) => setQuestion(e.target.value)}
-                  // eslint-disable-next-line jsx-a11y/no-autofocus
                   autoFocus
                 />
               </Box>
@@ -151,7 +150,6 @@ export function PollCreator({ roomId, onClose }: PollCreatorProps) {
               <Box direction="Column" gap="200">
                 <Text size="L400">Options</Text>
                 {options.map((opt, index) => (
-                  // eslint-disable-next-line react/no-array-index-key
                   <Box key={index} alignItems="Center" gap="200">
                     <Input
                       style={{ flex: 1 }}

src/app/features/room/RoomViewHeader.tsx

@@ -583,7 +583,6 @@ export function RoomViewHeader({ callView }: { callView?: boolean }) {
                           <FocusTrap
                             focusTrapOptions={{
                               initialFocus: false,
-                              returnFocusOnDeactivate: false,
                               clickOutsideDeactivates: true,
                               onDeactivate: () => setViewTopic(false),
                               escapeDeactivates: stopPropagation,

src/app/features/room/RoomViewTyping.css.ts

@@ -25,3 +25,16 @@ export const RoomViewTyping = style([
 export const TypingText = style({
   flexGrow: 1,
 });
+
+// Visually hidden but available to assistive technology.
+export const SrOnly = style({
+  position: 'absolute',
+  width: 1,
+  height: 1,
+  padding: 0,
+  margin: -1,
+  overflow: 'hidden',
+  clip: 'rect(0, 0, 0, 0)',
+  whiteSpace: 'nowrap',
+  border: 0,
+});

src/app/features/room/RoomViewTyping.tsx

@@ -33,8 +33,21 @@ export const RoomViewTyping = as<'div', RoomViewTypingProps>(
       [typingMembers, myUserId, room],
     );
 
-    if (typingNames.length === 0) {
-      return null;
+    // A single, non-truncated string for assistive technology to announce.
+    // Computed even when empty so the live region can stay mounted (below) —
+    // a `role="status"` region added to the DOM together with its first text
+    // is not reliably announced by some screen readers.
+    let typingAnnouncement = '';
+    if (typingNames.length === 1) {
+      typingAnnouncement = `${typingNames[0]} is typing`;
+    } else if (typingNames.length === 2) {
+      typingAnnouncement = `${typingNames[0]} and ${typingNames[1]} are typing`;
+    } else if (typingNames.length === 3) {
+      typingAnnouncement = `${typingNames[0]}, ${typingNames[1]} and ${typingNames[2]} are typing`;
+    } else {
+      typingAnnouncement = `${typingNames[0]}, ${typingNames[1]}, ${typingNames[2]} and ${
+        typingNames.length - 3
+      } others are typing`;
     }
 
     const handleDropAll = () => {
@@ -50,7 +63,12 @@ export const RoomViewTyping = as<'div', RoomViewTypingProps>(
     };
 
     return (
-      <div style={{ position: 'relative' }} aria-live="polite" aria-atomic="false">
+      <div style={{ position: 'relative' }}>
+        {/* Persistently mounted so the FIRST "X is typing" is announced. */}
+        <span className={css.SrOnly} role="status" aria-live="polite" aria-atomic="true">
+          {typingAnnouncement}
+        </span>
+        {typingNames.length > 0 && (
           <Box
             className={classNames(css.RoomViewTyping, className)}
             alignItems="Center"
@@ -59,7 +77,7 @@ export const RoomViewTyping = as<'div', RoomViewTypingProps>(
             ref={ref}
           >
             <TypingIndicator />
-          <Text className={css.TypingText} size="T300" truncate>
+            <Text className={css.TypingText} size="T300" truncate aria-hidden>
               {typingNames.length === 1 && (
                 <>
                   <b>{typingNames[0]}</b>
@@ -127,6 +145,7 @@ export const RoomViewTyping = as<'div', RoomViewTypingProps>(
               <Icon size="50" src={Icons.Cross} />
             </IconButton>
           </Box>
+        )}
       </div>
     );
   },

src/app/features/room/message/Message.tsx

@@ -56,6 +56,7 @@ import {
   getMemberDisplayName,
 } from '../../../utils/room';
 import { getMxIdLocalPart, mxcUrlToHttp } from '../../../utils/matrix';
+import { messageAriaLabel } from '../../../utils/a11y';
 import { MessageLayout, MessageSpacing } from '../../../state/settings';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
 import { useRecentEmoji } from '../../../hooks/useRecentEmoji';
@@ -972,6 +973,10 @@ export const Message = React.memo(
             [MsgAppearClass]: playAppear,
             [MentionHighlightPulse]: playMentionPulse,
           })}
+          role="article"
+          aria-label={
+            collapse ? messageAriaLabel(senderDisplayName, mEvent.getTs(), hour24Clock) : undefined
+          }
           tabIndex={0}
           space={messageSpacing}
           collapse={collapse}

src/app/features/room/message/MessageEditor.tsx

@@ -51,7 +51,13 @@ import { UseStateProvider } from '../../../components/UseStateProvider';
 import { EmojiBoard } from '../../../components/emoji-board';
 import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
-import { getEditedEvent, getMentionContent, trimReplyFromFormattedBody } from '../../../utils/room';
+import {
+  getEditedEvent,
+  getMemberDisplayName,
+  getMentionContent,
+  trimReplyFromFormattedBody,
+} from '../../../utils/room';
+import { getMxIdLocalPart } from '../../../utils/matrix';
 import { mobileOrTablet } from '../../../utils/user-agent';
 import { useComposingCheck } from '../../../hooks/useComposingCheck';
 
@@ -66,6 +72,12 @@ export const MessageEditor = as<'div', MessageEditorProps>(
   ({ room, roomId, mEvent, imagePackRooms, onCancel, ...props }, ref) => {
     const mx = useMatrixClient();
     const editor = useEditor();
+    // Accessible name for the edit textbox so screen readers announce which
+    // message is being edited (a11y, P3-4).
+    const editSenderId = mEvent.getSender();
+    const editSenderName = editSenderId
+      ? (getMemberDisplayName(room, editSenderId) ?? getMxIdLocalPart(editSenderId) ?? editSenderId)
+      : '';
     const [enterForNewline] = useSetting(settingsAtom, 'enterForNewline');
     const [globalToolbar] = useSetting(settingsAtom, 'editorToolbar');
     const [isMarkdown] = useSetting(settingsAtom, 'isMarkdown');
@@ -259,6 +271,7 @@ export const MessageEditor = as<'div', MessageEditorProps>(
         <CustomEditor
           editor={editor}
           placeholder="Edit message..."
+          ariaLabel={editSenderId ? `Editing message from ${editSenderName}` : 'Edit message'}
           onKeyDown={handleKeyDown}
           onKeyUp={handleKeyUp}
           bottom={

src/app/features/room/message/Reactions.tsx

@@ -106,7 +106,6 @@ export const Reactions = as<'div', ReactionsProps>(
               <FocusTrap
                 focusTrapOptions={{
                   initialFocus: false,
-                  returnFocusOnDeactivate: false,
                   onDeactivate: () => setViewer(false),
                   clickOutsideDeactivates: true,
                   escapeDeactivates: stopPropagation,

src/app/features/search/Search.tsx

@@ -247,7 +247,6 @@ export function Search({ requestClose }: SearchProps) {
         <FocusTrap
           focusTrapOptions={{
             initialFocus: () => inputRef.current,
-            returnFocusOnDeactivate: false,
             allowOutsideClick: true,
             clickOutsideDeactivates: true,
             onDeactivate: requestClose,
@@ -257,7 +256,13 @@ export function Search({ requestClose }: SearchProps) {
             },
           }}
         >
-          <Modal size="400" style={{ maxHeight: toRem(400), borderRadius: config.radii.R500 }}>
+          <Modal
+            size="400"
+            role="dialog"
+            aria-modal="true"
+            aria-label="Search"
+            style={{ maxHeight: toRem(400), borderRadius: config.radii.R500 }}
+          >
             <Box
               shrink="No"
               style={{ padding: config.space.S400, paddingBottom: 0 }}
@@ -270,6 +275,7 @@ export function Search({ requestClose }: SearchProps) {
                 radii="400"
                 outlined
                 placeholder="Search"
+                aria-label="Search rooms"
                 before={<Icon size="200" src={Icons.Search} />}
                 onChange={handleInputChange}
                 onKeyDown={handleInputKeyDown}

src/app/features/settings/general/General.tsx

@@ -531,6 +531,7 @@ function Appearance() {
               Intensity: {nightLightOpacity}%
             </Text>
             <input
+              aria-label="Night light intensity"
               type="range"
               min={5}
               max={80}
@@ -1663,6 +1664,7 @@ function Calls() {
                     <Text size="T200">{callDenoiseGateThreshold} dB</Text>
                   </Box>
                   <input
+                    aria-label="Noise gate threshold"
                     type="range"
                     min="-100"
                     max="0"

src/app/features/shortcuts/KeyboardShortcutsDialog.css.ts

@@ -0,0 +1,49 @@
+import { style } from '@vanilla-extract/css';
+import { DefaultReset, color, config, toRem } from 'folds';
+
+export const ShortcutList = style([
+  DefaultReset,
+  {
+    margin: 0,
+  },
+]);
+
+export const ShortcutRow = style({
+  padding: `${config.space.S100} 0`,
+});
+
+export const ShortcutTerm = style([
+  DefaultReset,
+  {
+    flexGrow: 1,
+  },
+]);
+
+export const ShortcutKeys = style([
+  DefaultReset,
+  {
+    display: 'flex',
+    alignItems: 'center',
+    gap: config.space.S100,
+    flexShrink: 0,
+  },
+]);
+
+export const Kbd = style([
+  DefaultReset,
+  {
+    display: 'inline-flex',
+    alignItems: 'center',
+    justifyContent: 'center',
+    minWidth: toRem(20),
+    padding: `0 ${config.space.S200}`,
+    height: toRem(24),
+    fontFamily: 'inherit',
+    fontSize: toRem(12),
+    lineHeight: toRem(24),
+    color: color.SurfaceVariant.OnContainer,
+    backgroundColor: color.SurfaceVariant.Container,
+    border: `${config.borderWidth.B300} solid ${color.SurfaceVariant.ContainerLine}`,
+    borderRadius: config.radii.R300,
+  },
+]);

src/app/features/shortcuts/KeyboardShortcutsDialog.tsx

@@ -0,0 +1,208 @@
+import React, { useCallback } from 'react';
+import FocusTrap from 'focus-trap-react';
+import { atom, useAtom, useSetAtom } from 'jotai';
+import {
+  Box,
+  Dialog,
+  Header,
+  Icon,
+  IconButton,
+  Icons,
+  Line,
+  Overlay,
+  OverlayBackdrop,
+  OverlayCenter,
+  Scroll,
+  Text,
+  config,
+} from 'folds';
+import { stopPropagation } from '../../utils/keyboard';
+import { editableActiveElement } from '../../utils/dom';
+import { useKeyDown } from '../../hooks/useKeyDown';
+import { useModalStyle } from '../../hooks/useModalStyle';
+import { useSetting } from '../../state/hooks/settings';
+import { settingsAtom } from '../../state/settings';
+import { isMacOS } from '../../utils/user-agent';
+import { KeySymbol } from '../../utils/key-symbol';
+import * as css from './KeyboardShortcutsDialog.css';
+
+/** Global open-state for the keyboard shortcuts help dialog. */
+export const keyboardShortcutsDialogAtom = atom<boolean>(false);
+
+/** Read/control the keyboard shortcuts dialog open-state. */
+export function useKeyboardShortcutsDialog() {
+  const [open, setOpen] = useAtom(keyboardShortcutsDialogAtom);
+  const openDialog = useCallback(() => setOpen(true), [setOpen]);
+  const closeDialog = useCallback(() => setOpen(false), [setOpen]);
+  return { open, openDialog, closeDialog };
+}
+
+/**
+ * Registers the global `Shift + /` (`?`) shortcut that opens the keyboard
+ * shortcuts help dialog. Ignored while the user is typing into an input,
+ * textarea or contenteditable so it never steals a literal `?` character.
+ *
+ * Mount once in the client shell (e.g. `ClientNonUIFeatures`).
+ */
+export function useKeyboardShortcutsTrigger() {
+  const setOpen = useSetAtom(keyboardShortcutsDialogAtom);
+  useKeyDown(
+    window,
+    useCallback(
+      (evt: KeyboardEvent) => {
+        // Never intercept `?` while the user is typing into a field/editor.
+        if (editableActiveElement()) return;
+        // `?` is produced by Shift + `/` on the common layouts.
+        if (evt.key === '?') {
+          evt.preventDefault();
+          // Stop RoomView's window-level "type any char → focus composer"
+          // handler from also firing — otherwise focus lands in the composer
+          // behind the dialog and Escape gets swallowed by the contenteditable.
+          evt.stopImmediatePropagation();
+          setOpen(true);
+        }
+      },
+      [setOpen],
+    ),
+  );
+}
+
+type ShortcutRow = {
+  description: string;
+  keys: string[];
+};
+
+type ShortcutSection = {
+  title: string;
+  rows: ShortcutRow[];
+};
+
+function ShortcutKeys({ keys }: { keys: string[] }) {
+  return (
+    <Box as="dd" className={css.ShortcutKeys}>
+      {keys.map((key, index) => (
+        <kbd key={`${key}-${index}`} className={css.Kbd}>
+          {key}
+        </kbd>
+      ))}
+    </Box>
+  );
+}
+
+/**
+ * Accessible keyboard shortcuts help dialog. Renders (as a modal overlay) only
+ * while `keyboardShortcutsDialogAtom` is `true`. Open it with the `?` shortcut
+ * (see `useKeyboardShortcutsTrigger`) or via `useKeyboardShortcutsDialog`.
+ */
+export function KeyboardShortcutsDialog() {
+  const { open, closeDialog } = useKeyboardShortcutsDialog();
+  const modalStyle = useModalStyle(480);
+  const [enterForNewline] = useSetting(settingsAtom, 'enterForNewline');
+
+  const modKey = isMacOS() ? KeySymbol.Command : 'Ctrl';
+
+  if (!open) return null;
+
+  const sections: ShortcutSection[] = [
+    {
+      title: 'General',
+      rows: [
+        { description: 'Show keyboard shortcuts', keys: ['?'] },
+        { description: 'Close open panel, otherwise mark room as read', keys: [KeySymbol.Escape] },
+      ],
+    },
+    {
+      title: 'Composer',
+      rows: [
+        { description: 'Focus the message composer', keys: ['Any character'] },
+        {
+          description: 'Send message',
+          keys: enterForNewline ? [modKey, 'Enter'] : ['Enter'],
+        },
+        {
+          description: 'Insert a new line',
+          keys: enterForNewline ? ['Enter'] : [KeySymbol.Shift, 'Enter'],
+        },
+        { description: 'Send message (always)', keys: [modKey, 'Enter'] },
+      ],
+    },
+    {
+      title: 'Messages',
+      rows: [
+        { description: 'Reveal message actions (react, reply, more)', keys: ['Hover / focus'] },
+      ],
+    },
+  ];
+
+  return (
+    <Overlay open backdrop={<OverlayBackdrop />}>
+      <OverlayCenter>
+        <FocusTrap
+          focusTrapOptions={{
+            initialFocus: false,
+            onDeactivate: closeDialog,
+            clickOutsideDeactivates: true,
+            escapeDeactivates: stopPropagation,
+          }}
+        >
+          <Dialog
+            variant="Surface"
+            aria-labelledby="keyboard-shortcuts-dialog-title"
+            style={modalStyle}
+          >
+            <Header
+              style={{
+                padding: `0 ${config.space.S200} 0 ${config.space.S400}`,
+                borderBottomWidth: config.borderWidth.B300,
+              }}
+              variant="Surface"
+              size="500"
+            >
+              <Box grow="Yes">
+                <Text as="h2" size="H4" id="keyboard-shortcuts-dialog-title">
+                  Keyboard Shortcuts
+                </Text>
+              </Box>
+              <IconButton size="300" onClick={closeDialog} radii="300" aria-label="Close">
+                <Icon src={Icons.Cross} />
+              </IconButton>
+            </Header>
+            <Scroll size="300" hideTrack visibility="Hover">
+              <Box style={{ padding: config.space.S400 }} direction="Column" gap="500">
+                {sections.map((section, sectionIndex) => (
+                  <Box key={section.title} direction="Column" gap="300">
+                    {sectionIndex > 0 && <Line variant="Surface" size="300" />}
+                    <Text size="L400" priority="400">
+                      {section.title}
+                    </Text>
+                    <Box as="dl" className={css.ShortcutList} direction="Column">
+                      {section.rows.map((row) => (
+                        <Box
+                          key={row.description}
+                          className={css.ShortcutRow}
+                          direction="Row"
+                          alignItems="Center"
+                          gap="200"
+                        >
+                          <Text as="dt" className={css.ShortcutTerm} size="T300">
+                            {row.description}
+                          </Text>
+                          <ShortcutKeys keys={row.keys} />
+                        </Box>
+                      ))}
+                    </Box>
+                  </Box>
+                ))}
+                <Text size="T200" priority="300">
+                  {enterForNewline
+                    ? 'Enter inserts a new line while “Enter for newline” is enabled in Settings.'
+                    : 'Enter sends the message. Enable “Enter for newline” in Settings to swap this.'}
+                </Text>
+              </Box>
+            </Scroll>
+          </Dialog>
+        </FocusTrap>
+      </OverlayCenter>
+    </Overlay>
+  );
+}

src/app/features/shortcuts/index.ts

@@ -0,0 +1 @@
+export * from './KeyboardShortcutsDialog';

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -42,6 +42,7 @@ import { toastQueueAtom } from '../../state/toast';
 import { useReminders } from '../../hooks/useReminders';
 import { useTauriUpdater } from '../../hooks/useTauriUpdater';
 import { TauriDesktopFeatures } from '../../components/TauriDesktopFeatures';
+import { KeyboardShortcutsDialog, useKeyboardShortcutsTrigger } from '../../features/shortcuts';
 import { useRoomsListener } from '../../hooks/useRoomsListener';
 import { threadNotificationsAtom } from '../../state/threadNotifications';
 import { roomIdToActiveThreadIdAtomFamily } from '../../state/room/thread';
@@ -213,7 +214,7 @@ function InviteNotifications() {
   ]);
 
   return (
-    <audio ref={audioRef} style={{ display: 'none' }}>
+    <audio ref={audioRef} style={{ display: 'none' }} aria-hidden="true">
       <source src={soundSrc ?? InviteSound} type="audio/ogg" />
     </audio>
   );
@@ -496,7 +497,7 @@ function MessageNotifications() {
   useRoomsListener(mx, ThreadEvent.NewReply, handleNewReply);
 
   return (
-    <audio ref={audioRef} style={{ display: 'none' }}>
+    <audio ref={audioRef} style={{ display: 'none' }} aria-hidden="true">
       <source src={soundSrc ?? NotificationSound} type="audio/ogg" />
     </audio>
   );
@@ -642,6 +643,13 @@ function LotusDenoiseFeature() {
   return null;
 }
 
+// Registers the global `?` shortcut (ignored while typing) and renders the
+// keyboard-shortcuts help dialog. Headless — the dialog self-gates on its atom.
+function KeyboardShortcutsFeature() {
+  useKeyboardShortcutsTrigger();
+  return <KeyboardShortcutsDialog />;
+}
+
 export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
   return (
     <>
@@ -656,6 +664,7 @@ export function ClientNonUIFeatures({ children }: ClientNonUIFeaturesProps) {
       <TauriDesktopFeatures />
       <LotusDenoiseFeature />
       <DeepLinkNavigator />
+      <KeyboardShortcutsFeature />
       {children}
     </>
   );

src/app/plugins/react-custom-html-parser.tsx

@@ -229,13 +229,21 @@ export const scaleSystemEmoji = (text: string): (string | JSX.Element)[] =>
   findAndReplace(
     text,
     EMOJI_REG_G,
-    (match, pushIndex) => (
+    (match, pushIndex) => {
+      const shortcode = getShortcodeFor(getHexcodeForEmoji(match[0]));
+      return (
         <span key={`scaleSystemEmoji-${pushIndex}`} className={css.EmoticonBase}>
-        <span className={css.Emoticon()} title={getShortcodeFor(getHexcodeForEmoji(match[0]))}>
+          <span
+            className={css.Emoticon()}
+            title={shortcode}
+            aria-label={shortcode || undefined}
+            role={shortcode ? 'img' : undefined}
+          >
             {match[0]}
           </span>
         </span>
-    ),
+      );
+    },
     (txt) => txt,
   );
 
@@ -574,10 +582,20 @@ export const getReactCustomHtmlParser = (
             );
           }
           if (htmlSrc && 'data-mx-emoticon' in props) {
+            const emoticonAlt =
+              (typeof props.alt === 'string' && props.alt) ||
+              (typeof props.title === 'string' && props.title) ||
+              'emoji';
             return (
               <span className={css.EmoticonBase}>
                 <span className={css.Emoticon()}>
-                  <img {...props} className={css.EmoticonImg} src={htmlSrc} loading="lazy" />
+                  <img
+                    {...props}
+                    alt={emoticonAlt}
+                    className={css.EmoticonImg}
+                    src={htmlSrc}
+                    loading="lazy"
+                  />
                 </span>
               </span>
             );
@@ -611,7 +629,6 @@ export const getReactCustomHtmlParser = (
               <>
                 {segments.map((segment, index) => {
                   if (segment.type === 'text') {
-                    // eslint-disable-next-line react/no-array-index-key
                     return (
                       <React.Fragment key={index}>{renderTextChunk(segment.value)}</React.Fragment>
                     );
@@ -619,7 +636,6 @@ export const getReactCustomHtmlParser = (
                   const raw =
                     segment.type === 'block' ? `$$${segment.value}$$` : `$${segment.value}$`;
                   return (
-                    // eslint-disable-next-line react/no-array-index-key
                     <React.Fragment key={index}>
                       {renderMath(segment.value, segment.type === 'block', raw, raw)}
                     </React.Fragment>

src/app/utils/a11y.test.ts

@@ -0,0 +1,28 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import dayjs from 'dayjs';
+import { messageAriaLabel } from './a11y';
+import { timeDayMonthYear, timeHourMinute } from './time';
+
+test('messageAriaLabel composes sender, date and time (24h)', () => {
+  const ts = dayjs('2026-07-01T14:30:00').valueOf();
+  assert.equal(
+    messageAriaLabel('Alice', ts, true),
+    `Alice, ${timeDayMonthYear(ts)} ${timeHourMinute(ts, true)}`,
+  );
+});
+
+test('messageAriaLabel honours the 12-hour clock preference', () => {
+  const ts = dayjs('2026-07-01T14:30:00').valueOf();
+  assert.equal(
+    messageAriaLabel('Bob', ts, false),
+    `Bob, ${timeDayMonthYear(ts)} ${timeHourMinute(ts, false)}`,
+  );
+});
+
+test('messageAriaLabel keeps the sender name verbatim as plain text', () => {
+  const ts = dayjs('2026-07-01T09:05:00').valueOf();
+  const label = messageAriaLabel('@user:example.org', ts, true);
+  assert.ok(label.startsWith('@user:example.org, '));
+  assert.ok(!label.includes('<'));
+});

src/app/utils/a11y.ts

@@ -0,0 +1,14 @@
+import { timeDayMonthYear, timeHourMinute } from './time';
+
+/**
+ * Builds a plain-text accessible label for a message row, used when the
+ * visible sender/timestamp header is collapsed and therefore hidden from
+ * assistive technology.
+ *
+ * @param sender - Sender display name (already resolved to a human string).
+ * @param ts - Message origin timestamp in milliseconds.
+ * @param hour24Clock - Whether to format the time using a 24-hour clock.
+ * @returns A label such as `Alice, 1 July 2026 14:30`.
+ */
+export const messageAriaLabel = (sender: string, ts: number, hour24Clock: boolean): string =>
+  `${sender}, ${timeDayMonthYear(ts)} ${timeHourMinute(ts, hour24Clock)}`;