docs: add backlog (E–K) of fixed-but-unverified items to testing guide

Sweeps every remaining "FIXED ⚠️ UNTESTED" item from LOTUS_BUGS.md and
LOTUS_TODO.md into the testing guide, grouped by environment (mobile,
theming, calls, media/perf, accessibility/screen-reader, desktop/Tauri,
features) so each category can be verified in one pass.

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

LOTUS_TESTING.md

@@ -206,6 +206,131 @@ If any control does nothing, that usually means an EC DOM selector changed — c
 
 ---
 
+# Backlog of previously-fixed-but-unverified items
+
+> Sections A–D above are **this session's** work. Everything below was fixed in earlier waves and is still flagged **⚠️ UNTESTED** in `LOTUS_BUGS.md` / `LOTUS_TODO.md`. They're grouped by what kind of environment you need (mobile, desktop, screen reader, etc.) so you can knock out a whole category at once. None of these are urgent the way A–D are; do them as you have the right device handy.
+
+## E. Mobile / responsive (needs a real phone, or devtools device emulation)
+
+### E1. Composer toolbar touch targets (#7)
+
+On a phone, open a room and the composer toolbar. Tap each button (attach, format, sticker, emoji, GIF, location, poll, schedule, send).
+**Expected:** every button is comfortably tappable (≥44×44px), no mis-taps hitting the wrong icon.
+
+### E2. Room Settings — no horizontal overflow (#8)
+
+On a narrow phone screen, open **Room Settings**.
+**Expected:** the settings nav panel fills the full width; **no** horizontal scrollbar / sideways scrolling anywhere in the panel.
+
+### E3. Modals go fullscreen on mobile (#9)
+
+On a phone, open several dialogs: Leave Room, Create Room, Create Space, Invite User, Report (room/user/message), Edit History, Forward Message, Remind Me, Schedule Message, Device Verification, Poll Creator.
+**Expected:** each opens **fullscreen** (no floating box, no rounded corners / max-width margins). On desktop the same modals should still be the normal centered boxes.
+
+### E4. Composer not hidden by the keyboard (#10) — iOS Safari especially
+
+On a phone (priority: **iOS Safari**), tap into the composer so the on-screen keyboard appears.
+**Expected:** the composer input stays **visible above** the keyboard; the layout shrinks rather than the composer sliding under the keyboard.
+
+### E5. Mobile "Saved Messages" access (Mobile Bookmarks)
+
+On a phone, **inside a room**, open the room header **··· More Options** menu.
+**Expected:** a **"Saved Messages"** item is present; tapping it opens the bookmarks panel. (This was the only in-room access point missing on mobile.)
+
+---
+
+## F. Visual / theming
+
+### F1. Animated chat background — no flicker (#2)
+
+Settings → set an **animated** chat background (e.g. anim-rain / anim-aurora / anim-stars). Watch the message text and composer while it animates.
+**Expected:** smooth animation, **no flickering / shimmering** on message text or the composer, especially after scrolling. Note your GPU/browser if you see artifacts.
+
+### F2. Background vs. Seasonal theme are mutually exclusive (#6)
+
+In Settings → Appearance:
+
+1. Pick a **chat background** → confirm any **seasonal theme** auto-switches off.
+2. Pick a **seasonal theme** → confirm the **chat background** auto-clears to none.
+3. (Edge) If you have old data with both set, after reload only one should visibly apply (no double-overlay clutter).
+
+---
+
+## G. Calls — additional unverified (👥 2 people)
+
+### G1. PiP mute badges point at the right person (#12)
+
+In a call with at least one other person, pop out the **Picture-in-Picture** mini window.
+
+- **You** mute your own mic → a **"You"/muted badge appears bottom-left** (your status).
+- A **remote** participant (or all of them) mutes → an **"All muted"** badge appears **top-right** (clearly about other people).
+  **Expected:** the bottom-left badge is **never** triggered by someone else muting — that was the original bug (it looked like your own mic was muted when it wasn't).
+
+### G2. Full-screen camera broadcasts
+
+1. In a **camera-only** call (no screenshare), confirm the **Fullscreen** button is available (previously only showed during screenshare).
+2. Use **MemberGlance → Focus camera** to full-screen/spotlight a specific person's camera. (Overlaps **A5**; if you've done A5 you can skip.)
+
+---
+
+## H. Media / performance (needs a room with many images)
+
+### H1. Lazy image decryption (P5-5 / MediaGallery)
+
+Open a room / media gallery with **many images** (ideally encrypted). Scroll down through them.
+**Expected:** images decrypt/load as they **approach the viewport**, not all at once on open; scrolling stays smooth and memory doesn't balloon. Off-screen images shouldn't all decode up front.
+
+### H2. Thumbnail framing (P5-6)
+
+Look at **tall portrait** images in the timeline and in the media gallery.
+**Expected:** thumbnails are framed **center-top** (so faces/subjects at the top aren't cropped out); no awkward stretching. Opening the full-size viewer still shows the **whole** image (contain, not cropped).
+
+---
+
+## I. Accessibility (needs a screen reader: VoiceOver / NVDA / TalkBack)
+
+With a screen reader on, navigate message hover-actions and content and confirm each control **announces a meaningful label** (not "button" / blank):
+
+- [ ] **Reaction** buttons announce the emoji + count (e.g. "thumbsup reaction, 3 people").
+- [ ] **Edit history** button announces "View edit history".
+- [ ] **Thread indicator** announces "View thread".
+- [ ] **Reply** (jump to original) announces "Jump to original message".
+
+---
+
+## J. Desktop / Tauri build only
+
+### J1. Proactive update notifications (P5-40)
+
+In the **desktop (Tauri)** build, with an update available, launch the app (and/or leave it running ~12h).
+**Expected:** an in-app toast/badge alerts you that an update is available, without manually checking Settings. (Needs an actual newer release to point at.)
+
+### J2. DTLN noise suppression sanity
+
+In Settings → Calls, enable **ML noise suppression** with the **DTLN** model, then join a call.
+**Expected:** your mic audio still flows (no silence/robotic dropouts) and background noise is reduced. Confirmed working earlier but flagged for a final real-call check; verify on **both** web and desktop.
+
+---
+
+## K. Features — end-to-end unverified
+
+### K1. Remind Me Later
+
+On a message, **··· → Remind Me**, pick a short preset (the 20-min one, or wait one out).
+**Expected:** when due, a Lotus toast fires linking to that message; the reminder then clears itself. Survives a reload while pending (stored in account data).
+
+### K2. Advanced search filters (P4-9)
+
+In message search: use the **sender picker** (instead of typing `from:@user`), the **date-range** quick presets (Today / Last week / Last month / Last year), and the **Has link** toggle.
+**Expected:** each narrows results correctly and reflects in the search.
+
+### K3. Notification content + click target (P5-20 partial)
+
+Trigger a desktop/browser notification for a new message.
+**Expected:** it shows the **real message body** (`username: message`, not "New inbox notification from…"); **clicking it** brings the window to front and navigates **directly to that message** (not just the inbox).
+
+---
+
 ## Priority if you're short on time
 
 1. **A4** (in-call banner) + **A3** (ringtone) — newest, most logic, hardest to reproduce.