chore: Fix all lint errors and remove unused code

- Fix 75 ESLint errors by updating eslint.config.mjs:
  - Add missing browser globals (MouseEvent, AbortController, Response, etc.)
  - Add Vite define global (__APP_VERSION__)
  - Configure @ts-nocheck to require descriptions
  - Add no-unused-vars rule for .mjs scripts

- Fix runtime bug in agent-output-modal.tsx (setOutput -> setStreamedContent)

- Remove ~120 unused variable warnings across 97 files:
  - Remove unused imports (React hooks, lucide icons, types)
  - Remove unused constants and variables
  - Remove unused function definitions
  - Prefix intentionally unused parameters with underscore

- Add descriptions to all @ts-nocheck comments (25 files)

- Clean up misc issues:
  - Remove invalid deprecation plugin comments
  - Fix eslint-disable comment placement
  - Add missing RefreshCw import in code-view.tsx

Reduces lint warnings from ~300 to 67 (all remaining are no-explicit-any)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/layout/project-switcher/components/notification-bell.tsx

@@ -3,7 +3,7 @@
  */
 
 import { useCallback } from 'react';
-import { Bell, Check, Trash2, ExternalLink } from 'lucide-react';
+import { Bell, Check, Trash2 } from 'lucide-react';
 import { useNavigate } from '@tanstack/react-router';
 import { useNotificationsStore } from '@/store/notifications-store';
 import { useLoadNotifications, useNotificationEvents } from '@/hooks/use-notification-events';

apps/ui/src/components/layout/project-switcher/components/project-context-menu.tsx

@@ -199,7 +199,6 @@ export function ProjectContextMenu({
   } = useAppStore();
   const [showRemoveDialog, setShowRemoveDialog] = useState(false);
   const [showThemeSubmenu, setShowThemeSubmenu] = useState(false);
-  const [removeConfirmed, setRemoveConfirmed] = useState(false);
   const themeSubmenuRef = useRef<HTMLDivElement>(null);
   const closeTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
@@ -331,7 +330,6 @@ export function ProjectContextMenu({
     toast.success('Project removed', {
       description: `${project.name} has been removed from your projects list`,
     });
-    setRemoveConfirmed(true);
   }, [moveProjectToTrash, project.id, project.name]);
 
   const handleDialogClose = useCallback(
@@ -340,8 +338,6 @@ export function ProjectContextMenu({
       // Close the context menu when dialog closes (whether confirmed or cancelled)
       // This prevents the context menu from reappearing after dialog interaction
       if (!isOpen) {
-        // Reset confirmation state
-        setRemoveConfirmed(false);
         // Always close the context menu when dialog closes
         onClose();
       }