feat(threads): implement thread side panel with full functionality

Implements Matrix thread support with side panels, browser, and notification integration.

Features:
- Thread Drawer: Side panel for viewing and replying within threads
  - Full message rendering with replies, reactions, edits, and deletions
  - Emoji picker and sticker support
  - Automatic read receipt management
- Thread Browser: Panel listing all room threads with search functionality
- Thread Chips: Visual indicators on messages that start threads
  - Shows reply count with participant avatars
  - Click to open thread drawer
- Unread Badge: Discord-style notification badge on thread icon showing unread count
- Cross-device Sync: Threads created on other devices automatically appear
  - Initializes Thread objects from room history on mount
  - Auto-creates Thread objects when receiving new thread events
- Notification Integration: Clicking inbox notifications for thread replies opens the thread

Implementation:
- Uses matrix-js-sdk Thread API (room.createThread(), room.getThreads())
- Filters thread replies from main timeline
- Scans timeline on mount to initialize Thread objects for existing threads
- Auto-creates Thread objects when receiving ThreadEvent.New
- Auto-opens drawer when navigating to thread events from notifications
- Tracks unread status using SDK notification APIs
- Thread reply counts exclude root message, reactions, and edits
- Proper state management with Jotai atoms per room
- Quality check script added for pre-push validation

Thread UX:
- Thread button in header opens drawer/browser
- Clicking thread chip on message opens drawer
- Thread browser shows all threads with search
- Jump button navigates to root message in timeline
- Thread drawer scrollable for long content
- Following indicator shows thread participants reading

Author: Evie Gauthier

.changeset/feat-threads.md

@@ -0,0 +1,5 @@
+---
+sable: minor
+---
+
+Add thread support with side panel, browser, unread badges, and cross-device sync

.changeset/fix_call_preferences.md

@@ -36,7 +36,7 @@ updates:
 
   - package-ecosystem: npm
     cooldown:
-      default-days: 7
+      default-days: 1
     directory: /
     schedule:
       interval: daily

.github/dependabot.yml

@@ -66,7 +66,7 @@ jobs:
           if [ "${{ github.event_name }}" = "pull_request" ]; then
             echo "alias=pr-${{ github.event.pull_request.number }}" >> "$GITHUB_OUTPUT"
           else
-            branch="${GITHUB_REF_NAME}"
+            branch="${{ github.ref_name }}"
             alias="$(echo "$branch" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/-\+/-/g' | sed 's/^-\|-$//g')"
             echo "alias=${alias}" >> "$GITHUB_OUTPUT"
           fi

.github/workflows/cloudflare-web-preview.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [dev]
     tags:
-      - 'v*'
+      - 'sable/v*'
   pull_request:
     paths:
       - 'Dockerfile'

.github/workflows/docker-publish.yml

@@ -4,13 +4,11 @@ on:
   pull_request:
   push:
     branches: [dev]
-  merge_group:
 
 jobs:
   format:
     name: Format check
     runs-on: ubuntu-latest
-    if: github.head_ref != 'release'
     permissions:
       contents: read
     steps:
@@ -28,7 +26,6 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
-    if: github.head_ref != 'release'
     permissions:
       contents: read
     steps:
@@ -46,7 +43,6 @@ jobs:
   typecheck:
     name: Typecheck
     runs-on: ubuntu-latest
-    if: github.head_ref != 'release'
     permissions:
       contents: read
     steps:
@@ -64,7 +60,6 @@ jobs:
   knip:
     name: Knip
     runs-on: ubuntu-latest
-    if: github.head_ref != 'release'
     permissions:
       contents: read
     steps:
@@ -78,20 +73,3 @@ jobs:
 
       - name: Run Knip
         run: pnpm run knip
-
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-    if: github.head_ref != 'release'
-    permissions:
-      contents: read
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          persist-credentials: false
-
-      - name: Setup app and build
-        uses: ./.github/actions/setup
-        with:
-          build: 'true'

.github/workflows/quality-checks.yml

@@ -3,15 +3,13 @@ name: Require Changeset
 on:
   pull_request:
     types: [opened, synchronize, reopened, labeled, unlabeled]
-  merge_group:
     branches: [dev]
 
 permissions: {}
 
 jobs:
   require-changeset:
     runs-on: ubuntu-latest
-    if: github.head_ref != 'release' && github.event_name != 'merge_group'
     permissions:
       contents: read
       pull-requests: write

.github/workflows/require-changeset.yml

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -e
+
+echo "Running quality checks..."
+echo ""
+
+echo "1/3 Checking formatting..."
+pnpm run fmt:check
+
+echo ""
+echo "2/3 Running linter..."
+pnpm run lint
+
+echo ""
+echo "3/3 Running type checker..."
+pnpm run typecheck
+
+echo ""
+echo "✅ All quality checks passed!"

scripts/check-quality.sh

@@ -26,13 +26,6 @@ import { CustomElement } from './slate';
 import * as css from './Editor.css';
 import { toggleKeyboardShortcut } from './keyboard';
 
-const initialValue: CustomElement[] = [
-  {
-    type: BlockType.Paragraph,
-    children: [{ text: '' }],
-  },
-];
-
 const withInline = (editor: Editor): Editor => {
   const { isInline } = editor;
 
@@ -96,6 +89,15 @@ export const CustomEditor = forwardRef<HTMLDivElement, CustomEditorProps>(
     },
     ref
   ) => {
+    // Each <Slate> instance must receive its own fresh node objects.
+    // Sharing a module-level constant causes Slate's global NODE_TO_ELEMENT
+    // WeakMap to be overwritten when multiple editors are mounted at the same
+    // time (e.g. RoomInput + MessageEditor in the thread drawer), leading to
+    // "Unable to find the path for Slate node" crashes.
+    const [slateInitialValue] = useState<CustomElement[]>(() => [
+      { type: BlockType.Paragraph, children: [{ text: '' }] },
+    ]);
+
     const renderElement = useCallback(
       (props: RenderElementProps) => <RenderElement {...props} />,
       []
@@ -132,7 +134,7 @@ export const CustomEditor = forwardRef<HTMLDivElement, CustomEditorProps>(
 
     return (
       <div className={`${css.Editor} ${className || ''}`} ref={ref}>
-        <Slate editor={editor} initialValue={initialValue} onChange={onChange}>
+        <Slate editor={editor} initialValue={slateInitialValue} onChange={onChange}>
           {top}
           <Box alignItems="Start">
             {before && (

src/app/components/editor/Editor.tsx

@@ -1,4 +1,4 @@
-import { MouseEventHandler, useCallback, useEffect, useRef, useState } from 'react';
+import { MouseEventHandler, useCallback, useRef, useState } from 'react';
 import {
   Box,
   Button,
@@ -15,13 +15,7 @@ import {
   toRem,
 } from 'folds';
 import FocusTrap from 'focus-trap-react';
-import { SequenceCard } from '$components/sequence-card';
-import { CallEmbed, useCallControlState } from '$plugins/call';
-import { stopPropagation } from '$utils/keyboard';
-import { AsyncStatus, useAsyncCallback } from '$hooks/useAsyncCallback';
-import { useRoom } from '$hooks/useRoom';
-import { ScreenSize, useScreenSizeContext } from '$hooks/useScreenSize';
-import { useCallPreferences } from '$state/hooks/callPreferences';
+import { SequenceCard } from '../../components/sequence-card';
 import * as css from './styles.css';
 import {
   ChatButton,
@@ -31,6 +25,11 @@ import {
   SoundButton,
   VideoButton,
 } from './Controls';
+import { CallEmbed, useCallControlState } from '../../plugins/call';
+import { stopPropagation } from '../../utils/keyboard';
+import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
+import { useRoom } from '../../hooks/useRoom';
+import { ScreenSize, useScreenSizeContext } from '../../hooks/useScreenSize';
 
 type CallControlsProps = {
   callEmbed: CallEmbed;
@@ -46,12 +45,6 @@ export function CallControls({ callEmbed }: CallControlsProps) {
     callEmbed.control
   );
 
-  const { setPreferences } = useCallPreferences();
-
-  useEffect(() => {
-    setPreferences({ microphone, video, sound });
-  }, [microphone, video, sound, setPreferences]);
-
   const [cords, setCords] = useState<RectCords>();
 
   const handleOpenMenu: MouseEventHandler<HTMLButtonElement> = (evt) => {