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/board-view/dialogs/add-feature-dialog.tsx

@@ -1,6 +1,5 @@
-// @ts-nocheck
+// @ts-nocheck - feature data building with conditional fields and model type inference
 import { useState, useEffect, useRef } from 'react';
-import { createLogger } from '@automaker/utils/logger';
 import {
   Dialog,
   DialogContent,
@@ -27,18 +26,10 @@ import { useNavigate } from '@tanstack/react-router';
 import { toast } from 'sonner';
 import { cn } from '@/lib/utils';
 import { modelSupportsThinking } from '@/lib/utils';
-import {
-  useAppStore,
-  ModelAlias,
-  ThinkingLevel,
-  FeatureImage,
-  PlanningMode,
-  Feature,
-} from '@/store/app-store';
+import { useAppStore, ThinkingLevel, FeatureImage, PlanningMode, Feature } from '@/store/app-store';
 import type { ReasoningEffort, PhaseModelEntry, AgentModel } from '@automaker/types';
 import { supportsReasoningEffort } from '@automaker/types';
 import {
-  TestingTabContent,
   PrioritySelector,
   WorkModeSelector,
   PlanningModeSelect,
@@ -57,8 +48,6 @@ import {
   type AncestorContext,
 } from '@automaker/dependency-resolver';
 
-const logger = createLogger('AddFeatureDialog');
-
 /**
  * Determines the default work mode based on global settings and current worktree selection.
  *