docs: threads + July batch across catalog/README/TODO/BUGS
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- LOTUS_FEATURES: new Threads section (+TOC) — panel, summary chips, thread
  composer isolation, under-the-hood notes; entries for KaTeX math, opt-in
  encrypted-search cache, hardened session storage, Crypto Diagnostics.
- README: threads bullet (with the replies-move-to-panel release note), math,
  search-cache bullets.
- LOTUS_TODO: P3-8 → [~] implemented + 6-step live-QA checklist; P4-1 marked
  unblocked.
- LOTUS_BUGS: Needs Verification rows for P3-8 / P4-4 / P4-8 / session sync.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
2026-07-01 21:58:42 -04:00
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@@ -18,15 +18,16 @@ Last updated: June 2026.
9. [Per-Message Read Receipts](#per-message-read-receipts)
10. [Delivery Status Indicators](#delivery-status-indicators)
11. [Messaging Enhancements](#messaging-enhancements)
12. [Presence](#presence)
13. [UX & Composer](#ux--composer)
14. [Room Customization](#room-customization)
15. [Moderation](#moderation)
16. [Notifications](#notifications)
17. [Server Integration](#server-integration)
18. [Infrastructure](#infrastructure)
19. [Desktop App Features](#desktop-app-features)
20. [Key Custom Files](#key-custom-files)
12. [Threads (P3-8)](#threads-p3-8)
13. [Presence](#presence)
14. [UX & Composer](#ux--composer)
15. [Room Customization](#room-customization)
16. [Moderation](#moderation)
17. [Notifications](#notifications)
18. [Server Integration](#server-integration)
19. [Infrastructure](#infrastructure)
20. [Desktop App Features](#desktop-app-features)
21. [Key Custom Files](#key-custom-files)
---
@@ -690,6 +691,24 @@ Context menu → **Forward** allows forwarding a message to any room the user is
- The search panel accepts `from_ts` and `to_ts` values (epoch milliseconds) passed to the search API
- A chip shows the active date range with an **×** button to clear it
### Encrypted Search Cache (P4-8, opt-in)
Persistent local index for encrypted-room search, so coverage survives page reloads instead of requiring re-pagination + re-decryption every session.
- Raw IndexedDB (`lotus-search-cache`): message rows keyed `[roomId, eventId]` + per-room coverage markers; merged into local search results with in-memory-wins dedupe
- **Opt-in, default OFF** (it stores decrypted text at rest): toggle + "Clear cached index" live in the search panel's Encrypted Rooms section, with the privacy note "Stores decrypted text on this device"
- Always wiped on logout; any IndexedDB error degrades to a cache-miss (never breaks search)
- Files: `src/app/utils/searchCache.ts`, `src/app/state/searchCacheEnabled.ts`, `features/message-search/useLocalMessageSearch.ts`
### Math / LaTeX Rendering (P4-4)
KaTeX-rendered math in messages, two paths:
- **Spec path (CS-API §11.5):** `<span/div data-mx-maths="…">` in `formatted_body` renders the attribute's LaTeX (block for div, inline for span); on render failure the element's child fallback content shows instead
- **Plain-text path:** `$…$` (inline) and `$$…$$` (block) with conservative rules — escape-aware (`\$`), currency-guarded (`$5 and $10` stays text), never inside `code`/`pre`
- KaTeX + its CSS load lazily on first math encountered — zero cost to the main bundle
- Files: `src/app/utils/mathParse.ts` (+14 tests), `components/math/KaTeX.tsx`, `plugins/react-custom-html-parser.tsx`
### Image / Video Captions
Images and videos can be sent with a caption. The caption and media are sent as a single event.
@@ -765,6 +784,31 @@ Generic (non-domain-specific) cards display a Google S2 favicon. Empty or unpars
---
## Threads (P3-8)
Full threaded-conversation support (`m.thread`, matrix-js-sdk `threadSupport`), Element-consistent.
### Thread Panel
A right-side drawer (mirrors the members drawer; fullscreen on mobile) with the thread's root message emphasized at top, an "N replies" divider, the full reply timeline (virtualized, back-paginates via `/relations`, decrypts E2EE threads), reactions/edits/redactions, and its own composer. Open it from **Reply in Thread** in the message menu, a reply's thread indicator, or a summary chip; close with **×** or Escape. Reading the panel sends threaded read receipts so per-thread unread counts clear.
### Summary Chips
Root messages in the main timeline show a **"N replies · time"** chip (server-aggregated `m.thread` bundle, or the live Thread once loaded) with an unread badge — threaded replies no longer render inline in the main timeline, so the chip is how conversations stay discoverable.
### Thread Composer
The panel embeds the full composer (uploads, emoji, stickers, GIFs, voice, location, polls) with drafts, reply state, and upload queues **isolated per thread** (`roomId::threadRootId` keys). Replies-to-replies produce spec-correct `m.thread` + `m.in_reply_to` (`is_falling_back: false`). Scheduling and slash commands are disabled inside threads (v1).
### Under the Hood
- `threadSupport: true` (startClient) partitions thread events into SDK `Thread` timelines; markAsRead sends **unthreaded** receipts so room badges keep clearing
- Pending sends render via a `LocalEchoUpdated` strip (chronological local echo never enters thread timelineSets)
- Deep links to thread events redirect into the panel
- Files: `features/room/thread/*`, `state/room/thread.ts`, `hooks/useThreadSummary.ts` (+35 tests across the stack)
---
## Presence
### Discord-Style Presence Selector
@@ -1160,6 +1204,14 @@ The `useAuthentication` parameter was previously mispositioned, causing unauthen
The `encUrlPreview` setting defaults to `true` rather than `false`. A security advisory chip in **Settings → Privacy** explains the tradeoff (the homeserver can see which URLs are being previewed) so users can make an informed choice.
### Hardened Session Storage (N97 partial, 2026-07)
The session persists as ONE atomic `cinny_session_v1` JSON write (previously ~10 separate localStorage keys written non-atomically). Reads prefer the blob with transparent migration from the legacy keys (dual-written one release for rollback). Cross-tab sync: logging out or in from one tab reloads the others so no tab runs with stale credentials. `state/sessions.ts` (22 tests), `hooks/useSessionSync.ts`.
### Crypto Diagnostics (E2EE investigation kit)
**Settings → Developer Tools → Crypto Diagnostics**: a capture-only ring buffer (max 200) hooks `console.warn/error` for E2EE failure signatures (OTK upload conflicts, missing call media keys, decryption errors, delayed-event timeouts) and downloads a JSON report — the evidence input for the KE-1→4 investigation. Companion runbook: [`LOTUS_E2EE_INVESTIGATION.md`](./LOTUS_E2EE_INVESTIGATION.md). `utils/cryptoDiagLog.ts`, `features/settings/developer/CryptoDiagnostics.tsx`.
---
## Desktop App Features