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/views/agent-tools-view.tsx

@@ -5,17 +5,7 @@ import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/com
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
-import {
-  FileText,
-  FolderOpen,
-  Terminal,
-  CheckCircle,
-  XCircle,
-  Play,
-  File,
-  Pencil,
-  Wrench,
-} from 'lucide-react';
+import { Terminal, CheckCircle, XCircle, Play, File, Pencil, Wrench } from 'lucide-react';
 import { Spinner } from '@/components/ui/spinner';
 import { cn } from '@/lib/utils';
 import { getElectronAPI } from '@/lib/electron';
@@ -29,13 +19,6 @@ interface ToolResult {
   timestamp: Date;
 }
 
-interface ToolExecution {
-  tool: string;
-  input: string;
-  result: ToolResult | null;
-  isRunning: boolean;
-}
-
 export function AgentToolsView() {
   const { currentProject } = useAppStore();
   const api = getElectronAPI();