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/graph-view/components/graph-controls.tsx

@@ -1,16 +1,7 @@
 import { useReactFlow, Panel } from '@xyflow/react';
 import { Button } from '@/components/ui/button';
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
-import {
-  ZoomIn,
-  ZoomOut,
-  Maximize2,
-  Lock,
-  Unlock,
-  GitBranch,
-  ArrowRight,
-  ArrowDown,
-} from 'lucide-react';
+import { ZoomIn, ZoomOut, Maximize2, Lock, Unlock, ArrowRight, ArrowDown } from 'lucide-react';
 import { cn } from '@/lib/utils';
 
 interface GraphControlsProps {

apps/ui/src/components/views/graph-view/graph-canvas.tsx

@@ -175,9 +175,7 @@ function GraphCanvasInner({
       mql.addEventListener('change', update);
       return () => mql.removeEventListener('change', update);
     }
-    // eslint-disable-next-line deprecation/deprecation
     mql.addListener(update);
-    // eslint-disable-next-line deprecation/deprecation
     return () => mql.removeListener(update);
   }, [effectiveTheme]);
 

apps/ui/src/components/views/graph-view/hooks/use-graph-layout.ts

@@ -1,6 +1,5 @@
 import { useCallback, useMemo, useRef } from 'react';
 import dagre from 'dagre';
-import { Node, Edge } from '@xyflow/react';
 import { TaskNode, DependencyEdge } from './use-graph-nodes';
 
 const NODE_WIDTH = 280;