feat: complete docked chat interactions

docs/CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to the KoalaSync browser extension and relay server.
 
 ---
 
+## Unreleased
+
+### Added
+- **Extension: Quick reactions** — Adds six encrypted one-click reactions with a local choice between chat-only display and bounded falling reactions over the video.
+- **Extension: Resilient chat activity** — Keeps a bounded per-room browser-session timeline for play, pause, seek, force-sync, join, and leave rows so overlay reinjection no longer loses them.
+
+### Changed
+- **Extension: Real dock behavior** — Anchors the collapsed Koala chat launcher to the selected side, reserves a page column in normal and fullscreen layouts, and clips viewport-bound page layers away from the open dock; detached mode remains freely movable.
+- **Extension: Koala chat launcher** — Replaces the generic speech-bubble emoji with the KoalaSync extension icon plus a chat marker.
+
 ## [v3.0.1] — 2026-07-26
 
 ### Added

docs/CHAT.md

@@ -52,6 +52,8 @@ the stamped value as AAD.
 - Maximum plaintext length: 500 Unicode code points.
 - Decrypted text is untrusted. Escape HTML before applying the supported limited
   Markdown formatting.
+- Quick reactions use the same encrypted message path as text. They remain readable
+  by current chat clients without adding a relay-visible reaction event.
 - No read receipts and no typing indicators.
 - The local message DOM is bounded; this is presentation state, not server history.
 
@@ -61,9 +63,21 @@ the stamped value as AAD.
 - Live modes: right, left, and detached.
 - Detached mode is draggable and moderately resizable. Size and position are stored
   per origin and clamped to the current viewport.
-- The overlay uses a Shadow DOM and never changes host-page layout.
+- Left and right modes anchor the launcher to the selected edge and reserve a
+  full-height page column while the panel is open. Detached mode is the only freely
+  movable launcher.
+- Docking keeps a reserved column on narrow pages and in fullscreen instead of
+  silently falling back to an overlay.
+- The overlay uses a Shadow DOM. Docking changes root-page or fullscreen-container
+  width and margins while the dock is open and clips viewport-bound page layers to
+  the remaining page column. The overrides stop applying when chat is detached or
+  closed, and the injected style element is removed when chat is destroyed.
 - On `fullscreenchange`, its host moves into `document.fullscreenElement` and remains
   visible.
+- Six encrypted quick reactions are available from the composer. Users can keep them
+  in chat or additionally show a bounded falling-emoji animation over the video.
+- Playback and room activity is retained in a bounded per-room browser-session
+  timeline so overlay reinjection does not lose command rows. It is not relay history.
 - It follows all eucalyptus, cyber, and graphite light/dark theme combinations.
 - Without a key, the panel stays closed and a disabled chat control explains that a
   current invite link is required.

docs/ROADMAP.md

@@ -37,9 +37,10 @@
 - **Category:** Social / Communication / Privacy
 - **Status:** Planned. This is a roadmap target, not a release announcement.
 - **Existing foundation:** Opt-in, live-only end-to-end encrypted room chat; a floating
-  chat bubble over the selected player opens a dockable, detachable, resizable overlay.
-  The relay stores no chat history and mixed extension versions use capability-gated
-  delivery.
+  Koala launcher over the selected player opens a dockable, detachable, resizable
+  overlay. Quick reactions can stay in chat or fall over the video, and a bounded
+  browser-session activity timeline survives overlay reinjection. The relay stores no
+  chat history and mixed extension versions use capability-gated delivery.
 
 #### Core experience
 
@@ -57,8 +58,8 @@
 
 #### Messaging
 
-- Replies with quoted context, emoji reactions, emoji picker, mentions, and typing
-  indicators.
+- Replies with quoted context, per-message reaction counters, a full emoji picker,
+  mentions, and typing indicators.
 - Edit and delete own messages with clear local tombstones; no silent mutation.
 - Delivery states (`sending`, `sent`, `failed`, `retry`) with idempotent retries and
   duplicate suppression after reconnects.