v2.6.0 — Collab overhaul, route travel times, chat & notes redesign

## Collab — Complete Redesign
- iMessage-style live chat with blue bubbles, grouped messages, date separators
- Emoji reactions via right-click (desktop) or double-tap (mobile)
- Twemoji (Apple-style) emoji picker with categories
- Link previews with OG image/title/description
- Soft-delete messages with "deleted a message" placeholder
- Message reactions with real-time WebSocket sync
- Chat timestamps respect 12h/24h setting and timezone

## Collab Notes
- Redesigned note cards with colored header bar (booking-card style)
- 2-column grid layout (desktop), 1-column (mobile)
- Category settings modal for managing categories with colors
- File/image attachments on notes with mini-preview thumbnails
- Website links with OG image preview on note cards
- File preview portal (lightbox for images, inline viewer for PDF/TXT)
- Note files appear in Files tab with "From Collab Notes" badge
- Pin highlighting with tinted background
- Author avatar chip in header bar with custom tooltip

## Collab Polls
- Complete rewrite — clean Apple-style poll cards
- Animated progress bars with vote percentages
- Blue check circles for own votes, voter avatars
- Create poll modal with multi-choice toggle
- Active/closed poll sections
- Custom tooltips on voter chips

## What's Next Widget
- New widget showing upcoming trip activities
- Time display with "until" separator
- Participant chips per activity
- Day grouping (Today, Tomorrow, dates)
- Respects 12h/24h and locale settings

## Route Travel Times
- Auto-calculated walking + driving times via OSRM (free, no API key)
- Floating badge on each route segment between places
- Walking person icon + car icon with times
- Hides when zoomed out (< zoom 16)
- Toggle in Settings > Display to enable/disable

## Other Improvements
- Collab addon enabled by default for new installations
- Coming Soon removed from Collab in admin settings
- Tab state persisted across page reloads (sessionStorage)
- Day sidebar expanded/collapsed state persisted
- File preview with extension badges (PDF, TXT, etc.) in Files tab
- Collab Notes filter tab in Files
- Reservations section in Day Detail view
- Dark mode fix for invite button text color
- Chat scroll hidden (no visible scrollbar)
- Mobile: tab icons removed for space, touch-friendly UI
- Fixed 6 backend data structure bugs in Collab (polls, chat, notes)
- Soft-delete for chat messages (persists in history)
- Message reactions table (migration 28)
- Note attachments via trip_files with note_id (migration 30)

## Database Migrations
- Migration 27: budget_item_members table
- Migration 28: collab_message_reactions table
- Migration 29: soft-delete column on collab_messages
- Migration 30: note_id on trip_files, website on collab_notes

server/src/db/database.js

@@ -553,7 +553,7 @@ function initDb() {
       `);
       // Ensure collab addon exists for existing installations
       try {
-        _db.prepare("INSERT OR IGNORE INTO addons (id, name, description, type, icon, enabled, sort_order) VALUES ('collab', 'Collab', 'Notes, polls, and live chat for trip collaboration', 'trip', 'Users', 0, 6)").run();
+        _db.prepare("INSERT OR IGNORE INTO addons (id, name, description, type, icon, enabled, sort_order) VALUES ('collab', 'Collab', 'Notes, polls, and live chat for trip collaboration', 'trip', 'Users', 1, 6)").run();
       } catch {}
     },
     // 26: Per-assignment times (instead of shared place times)
@@ -583,6 +583,29 @@ function initDb() {
         CREATE INDEX IF NOT EXISTS idx_budget_item_members_user ON budget_item_members(user_id);
       `);
     },
+    // 28: Message reactions
+    () => {
+      _db.exec(`
+        CREATE TABLE IF NOT EXISTS collab_message_reactions (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          message_id INTEGER NOT NULL REFERENCES collab_messages(id) ON DELETE CASCADE,
+          user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+          emoji TEXT NOT NULL,
+          created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+          UNIQUE(message_id, user_id, emoji)
+        );
+        CREATE INDEX IF NOT EXISTS idx_collab_reactions_msg ON collab_message_reactions(message_id);
+      `);
+    },
+    // 29: Soft-delete for chat messages
+    () => {
+      try { _db.exec('ALTER TABLE collab_messages ADD COLUMN deleted INTEGER DEFAULT 0'); } catch {}
+    },
+    // 30: Note attachments + website field
+    () => {
+      try { _db.exec('ALTER TABLE trip_files ADD COLUMN note_id INTEGER REFERENCES collab_notes(id) ON DELETE SET NULL'); } catch {}
+      try { _db.exec('ALTER TABLE collab_notes ADD COLUMN website TEXT'); } catch {}
+    },
     // Future migrations go here (append only, never reorder)
   ];
 
@@ -629,7 +652,7 @@ function initDb() {
       { id: 'documents', name: 'Documents', description: 'Store and manage travel documents', type: 'trip', icon: 'FileText', enabled: 1, sort_order: 2 },
       { id: 'vacay', name: 'Vacay', description: 'Personal vacation day planner with calendar view', type: 'global', icon: 'CalendarDays', enabled: 1, sort_order: 10 },
       { id: 'atlas', name: 'Atlas', description: 'World map of your visited countries with travel stats', type: 'global', icon: 'Globe', enabled: 1, sort_order: 11 },
-      { id: 'collab', name: 'Collab', description: 'Notes, polls, and live chat for trip collaboration', type: 'trip', icon: 'Users', enabled: 0, sort_order: 6 },
+      { id: 'collab', name: 'Collab', description: 'Notes, polls, and live chat for trip collaboration', type: 'trip', icon: 'Users', enabled: 1, sort_order: 6 },
     ];
     const insertAddon = _db.prepare('INSERT OR IGNORE INTO addons (id, name, description, type, icon, enabled, sort_order) VALUES (?, ?, ?, ?, ?, ?, ?)');
     for (const a of defaultAddons) insertAddon.run(a.id, a.name, a.description, a.type, a.icon, a.enabled, a.sort_order);