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/hooks/use-settings-migration.ts

@@ -53,17 +53,6 @@ interface MigrationState {
   error: string | null;
 }
 
-/**
- * localStorage keys that may contain settings to migrate
- */
-const LOCALSTORAGE_KEYS = [
-  'automaker-storage',
-  'automaker-setup',
-  'worktree-panel-collapsed',
-  'file-browser-recent-folders',
-  'automaker:lastProjectDir',
-] as const;
-
 // NOTE: We intentionally do NOT clear any localStorage keys after migration.
 // This allows users to switch back to older versions of Automaker that relied on localStorage.
 // The `localStorageMigrated` flag in server settings prevents re-migration on subsequent app loads.
@@ -136,7 +125,7 @@ export function parseLocalStorageSettings(): Partial<GlobalSettings> | null {
         const cacheProjectCount = cached?.projects?.length ?? 0;
         logger.info(`[CACHE_LOADED] projects=${cacheProjectCount}, theme=${cached?.theme}`);
         return cached;
-      } catch (e) {
+      } catch {
         logger.warn('Failed to parse settings cache, falling back to old storage');
       }
     } else {