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## Summary - Replace the permanently reserved composer activity row with a conditional, content-driven accessory for channel and thread composers. - Keep the composer dock geometrically stable while activity appears, so the composer’s bottom edge resizes smoothly without shifting the conversation. - Preserve translucent backdrop blur during the resize with a stable dock-level blur layer, and keep thread overlay/focus-mode alignment consistent. - Keep bottom-pinned virtualized conversations fully visible as composer content, zoom, or viewport height changes without repinning readers who have scrolled into history. - Refine the activity lockup with aligned avatars/text and a subtle, reduced-motion-safe shimmer. - Centralize the dock’s quiet inset, activity rail, released space, and activity offset in one CSS-variable geometry contract. This takes a different, systemic route from the spacing reduction proposed in #2602 and supersedes that approach. ### Related issue Related PR: #2602 ### Testing - `./scripts/check-branch-skew.sh` - `just desktop-check` - `just desktop-test` — 3,638 passing - `useAnchoredScroll.test.mjs` — virtualized viewport resize follows the explicit bottom state - Focused desktop smoke E2E — 6 passing across stable dock geometry, multiline growth, viewport resize, reduced motion, blur ownership, and thread overlay alignment - Pre-push hooks passed for organization safety, branch skew, desktop checks/tests, Rust tests, workspace tests, and desktop Tauri tests - Mobile pre-push is independently red on latest `main`; the exact `activity_page_test.dart` compiler failure reproduces on untouched `origin/main` - Visually tested channel and thread composers across quiet/activity states, multiline composer growth, and thread overlay/focus mode https://github.com/user-attachments/assets/ed0b08d9-18e0-4061-b272-ab509dbcd8ee --------- Signed-off-by: morgmart <98432065+morgmart@users.noreply.github.com>