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/mutations/use-github-mutations.ts

@@ -45,8 +45,6 @@ interface ValidateIssueInput {
  * ```
  */
 export function useValidateIssue(projectPath: string) {
-  const queryClient = useQueryClient();
-
   return useMutation({
     mutationFn: async (input: ValidateIssueInput) => {
       const { issue, model, thinkingLevel, reasoningEffort, comments, linkedPRs } = input;

apps/ui/src/hooks/mutations/use-worktree-mutations.ts

@@ -93,7 +93,7 @@ export function useCommitWorktree() {
       }
       return result.result;
     },
-    onSuccess: (_, { worktreePath }) => {
+    onSuccess: (_, { worktreePath: _worktreePath }) => {
       // Invalidate all worktree queries since we don't know the project path
       queryClient.invalidateQueries({ queryKey: ['worktrees'] });
       toast.success('Changes committed');

apps/ui/src/hooks/use-electron-agent.ts

@@ -1,4 +1,4 @@
-// @ts-nocheck
+// @ts-nocheck - Electron IPC boundary typing with stream events and message queuing
 import { useState, useEffect, useCallback, useRef } from 'react';
 import type { Message, StreamEvent } from '@/types/electron';
 import { useMessageQueue } from './use-message-queue';
@@ -161,16 +161,15 @@ export function useElectronAgent({
   );
 
   // Message queue for queuing messages when agent is busy
-  const { queuedMessages, isProcessingQueue, addToQueue, clearQueue, processNext } =
-    useMessageQueue({
-      onProcessNext: async (queuedMessage) => {
-        await sendMessageDirectly(
-          queuedMessage.content,
-          queuedMessage.images,
-          queuedMessage.textFiles
-        );
-      },
-    });
+  const { queuedMessages, isProcessingQueue, clearQueue, processNext } = useMessageQueue({
+    onProcessNext: async (queuedMessage) => {
+      await sendMessageDirectly(
+        queuedMessage.content,
+        queuedMessage.images,
+        queuedMessage.textFiles
+      );
+    },
+  });
 
   // Initialize connection and load history
   useEffect(() => {

apps/ui/src/hooks/use-event-recency.ts

@@ -6,7 +6,7 @@
  * through WebSocket (indicating the connection is healthy).
  */
 
-import { useEffect, useCallback } from 'react';
+import { useCallback } from 'react';
 import { create } from 'zustand';
 
 /**

apps/ui/src/hooks/use-responsive-kanban.ts

@@ -1,4 +1,4 @@
-// @ts-nocheck
+// @ts-nocheck - responsive breakpoint logic with layout state calculations
 import { useState, useEffect, useLayoutEffect, useCallback, useRef } from 'react';
 import { useAppStore } from '@/store/app-store';
 

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 {

apps/ui/src/hooks/use-settings-sync.ts

@@ -34,7 +34,6 @@ import {
   migratePhaseModelEntry,
   type GlobalSettings,
   type CursorModelId,
-  type OpencodeModelId,
   type CodexModelId,
   type GeminiModelId,
   type CopilotModelId,