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/project-settings-view/commands-section.tsx

@@ -1,5 +1,4 @@
 import { useState, useEffect, useCallback, type KeyboardEvent } from 'react';
-import { Label } from '@/components/ui/label';
 import { Input } from '@/components/ui/input';
 import { Button } from '@/components/ui/button';
 import { Terminal, Save, RotateCcw, Info, X, Play, FlaskConical } from 'lucide-react';

apps/ui/src/components/views/project-settings-view/project-identity-section.tsx

@@ -97,7 +97,7 @@ export function ProjectIdentitySection({ project }: ProjectIdentitySectionProps)
               description: result.error || 'Please try again.',
             });
           }
-        } catch (error) {
+        } catch {
           toast.error('Failed to upload icon', {
             description: 'Network error. Please try again.',
           });

apps/ui/src/components/views/project-settings-view/project-models-section.tsx

@@ -86,8 +86,6 @@ const MEMORY_TASKS: PhaseConfig[] = [
   },
 ];
 
-const ALL_PHASES = [...QUICK_TASKS, ...VALIDATION_TASKS, ...GENERATION_TASKS, ...MEMORY_TASKS];
-
 /**
  * Default feature model override section for per-project settings.
  */