web: rename Inbox nav label to Sources and surface Notifs higher

The /sources route shows raw sync-source feeds (Gmail, GitHub,
Telegram). Labeling it "Inbox" in the nav rail collided with the
notifications inbox concept that lives at /notifications, which made
it harder to find. Renaming to "Sources" matches the route URL and
removes the collision.

Also move the Notifs item up next to Chat so the actionable surface
sits at the top of the rail.

Author: alex-fedotyev

web/src/components/Layout/NavRail.tsx

@@ -9,14 +9,14 @@ import { ThemeToggle } from './ThemeToggle';
 
 const NAV_ITEMS = [
   { path: '/chat', icon: MessageSquare, label: 'Chat' },
+  { path: '/notifications', icon: Bell, label: 'Notifs' },
   { path: '/files', icon: FolderOpen, label: 'Files' },
   { path: '/tasks', icon: CheckSquare, label: 'Tasks' },
   { path: '/plans', icon: Lightbulb, label: 'Plans' },
   { path: '/skills', icon: Sparkles, label: 'Skills' },
   { path: '/mcp', icon: Plug, label: 'MCP' },
   { path: '/houseofagents', icon: Users, label: 'HoA', feature: 'hoa' as const },
-  { path: '/notifications', icon: Bell, label: 'Notifs' },
-  { path: '/sources', icon: Inbox, label: 'Inbox' },
+  { path: '/sources', icon: Inbox, label: 'Sources' },
   { path: '/cron', icon: Clock, label: 'Cron' },
   { path: '/memory', icon: Brain, label: 'Memory' },
   { path: '/diagnostics', icon: Activity, label: 'Diag' },