fix: repair invite links, social features, messaging + Discord UI overhaul

Phase 1 - Feature Repair:
- Fix member kick/leave: add missing db.delete() call in servers.ts
- Stabilize invite codes: return existing code instead of regenerating
- Fix user search: use LIKE instead of exact match in social.ts
- Wire DM button on FriendsPage to create/navigate to DM channels
- Add cancel outgoing friend request (DELETE endpoint + frontend)
- Add accept/decline friend request actions with WS real-time events
- Fix replyToId persistence in message creation
- Hydrate reactions and replyTo in message queries
- Add joinByCode to API client and serverStore
- Add friend_request_received/accepted WebSocket events

Phase 2 - Discord UI Overhaul:
- Remove stray borders between layout columns
- Replace shadow-sm with shadow-header on content headers
- Replace all bg-gray-*/text-gray-* with Discord color tokens
- Ensure flat color contrast (#1E1F22, #2B2D31, #313338)

Testing:
- Set up vitest + @testing-library/react + jsdom
- Add 17 tests across InviteModal, JoinServer, FriendsPage (all passing)
- Fix vite resolve.extensions to prefer .tsx over stale .js files

packages/web/package.json

@@ -9,23 +9,28 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "@livekit/components-react": "^2.7.4",
     "@opencord/shared": "workspace:*",
+    "livekit-client": "^2.9.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
-    "react-router-dom": "^6.28.0",
     "react-markdown": "^9.0.1",
-    "zustand": "^5.0.2",
-    "livekit-client": "^2.9.0",
-    "@livekit/components-react": "^2.7.4"
+    "react-router-dom": "^6.28.0",
+    "zustand": "^5.0.2"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
+    "@testing-library/user-event": "^14.6.1",
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
+    "jsdom": "^28.1.0",
     "postcss": "^8.4.49",
     "tailwindcss": "^3.4.15",
     "typescript": "^5.7.2",
-    "vite": "^6.0.3"
+    "vite": "^6.0.3",
+    "vitest": "^4.0.18"
   }
 }