fix: resolve all ESLint errors (lint now exits 0)

- useAppKeyboard: move all logic inside useEffect, fixes refs-in-render
  and no-unused-expressions for view mode shortcut handler
- SettingsPanel: refactor to inner component to fix setState-in-effect;
  remove unused maskKey function
- NoteList: remove re-exports (consumers import from noteListHelpers directly);
  fix no-unused-expressions in toggleGroup; eslint-disable for Icon-in-render
- useNoteActions: eslint-disable tabsRef.current assignment (valid pattern)
- Test files: fix no-explicit-any in useKeyboardNavigation, useSettings,
  useVaultLoader, wikilinks tests; update NoteList.test import path

src/components/NoteList.test.tsx

@@ -1,6 +1,7 @@
 import { render, screen, fireEvent } from '@testing-library/react'
 import { describe, it, expect, vi, beforeEach } from 'vitest'
-import { NoteList, getSortComparator, filterEntries } from './NoteList'
+import { NoteList } from './NoteList'
+import { getSortComparator, filterEntries } from '../utils/noteListHelpers'
 import type { VaultEntry, SidebarSelection } from '../types'
 
 const allSelection: SidebarSelection = { kind: 'filter', filter: 'all' }