feat(ux): forward to multiple rooms + live bookmark previews (P6-3)

Forward: checkbox multi-select room picker + "Send to N rooms" batch send
(Promise.allSettled). Full success auto-closes; partial failure keeps the dialog
open with a "Forwarded to X/N — failed: …" summary and prunes the selection to
only the failures (retry won't duplicate to already-sent rooms). Content builder
extracted to a unit-tested forwardContent.ts (edit-forwarding, reply-strip,
undecryptable-refused; 4 tests).

Bookmarks: BookmarksPanel resolves each saved message's live event (useRoomEvent)
so previews reflect edits and show a deleted indicator for redactions; the stored
snapshot stays as the fallback while loading, on fetch failure, or after leaving
the room. Stored bookmark shape unchanged.

Gates: tsc/eslint/prettier clean, build OK, 665 tests. Reviewed (dup-resend on
retry + Checkbox readOnly fixed).

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

LOTUS_BUGS.md

@@ -44,6 +44,7 @@ Implemented and gate-green; confirm each per `LOTUS_TESTING.md`, then delete the
 | 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                                                                                                                           |
 | P6-1 | Desktop Linux parity (no-sleep in calls, launcher badge), autostart toggle, tray Do-Not-Disturb                                         | `native/power.rs`, `lib.rs`, `useTauriDnd`, `General.tsx`                  | Linux desktop: no display sleep during a call; tray DND silences notifications; launch-on-login persists; Unity badge (Ubuntu); DND toggle polarity                                       |
 | P6-2 | EC deafen/screenshare-audio-mute via `io.lotus.set_deafen` (retires the `<audio>.muted` iframe hack)                                    | fork `lotusDeafen.ts`, cinny `CallControl.ts`                              | AFTER publish+pin-bump: deafen silences remote audio + survives a reconnect / new screenshare / late joiner (the cases the DOM hack failed); screenshare-audio-mute toggles independently |
+| P6-3 | Forward-to-multiple-rooms (multi-select + partial-failure summary) + live bookmark previews (edits/redactions, snapshot fallback)       | `ForwardMessageDialog.tsx`+`forwardContent.ts`, `BookmarksPanel.tsx`       | forward one msg to 3 rooms (incl. 1 you cannot post to = partial summary); bookmark then edit shows edited; redact shows deleted; leave room shows snapshot                               |
 
 **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.