refactor: extract hooks from App.tsx to improve code health (#62)

Extract vault management (useVaultSwitcher), git history loading
(useGitHistory), dialog state (useDialogs), and keyboard/command
setup (useAppCommands) into dedicated hooks. App.tsx code health
improves from 8.95 to 10.0 — all extracted hooks also score 10.0.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/hooks/useAppCommands.ts

@@ -0,0 +1,82 @@
+import { useAppKeyboard } from './useAppKeyboard'
+import { useCommandRegistry } from './useCommandRegistry'
+import type { CommandAction } from './useCommandRegistry'
+import { useKeyboardNavigation } from './useKeyboardNavigation'
+import type { SidebarSelection, VaultEntry } from '../types'
+import type { ViewMode } from './useViewMode'
+
+interface Tab { entry: VaultEntry; content: string }
+
+interface AppCommandsConfig {
+  activeTabPath: string | null
+  activeTabPathRef: React.MutableRefObject<string | null>
+  handleCloseTabRef: React.MutableRefObject<(path: string) => void>
+  tabs: Tab[]
+  entries: VaultEntry[]
+  allContent: Record<string, string>
+  modifiedCount: number
+  selection: SidebarSelection
+  onQuickOpen: () => void
+  onCommandPalette: () => void
+  onCreateNote: () => void
+  onSave: () => void
+  onOpenSettings: () => void
+  onTrashNote: (path: string) => void
+  onArchiveNote: (path: string) => void
+  onUnarchiveNote: (path: string) => void
+  onCommitPush: () => void
+  onSetViewMode: (mode: ViewMode) => void
+  onToggleInspector: () => void
+  onSelect: (sel: SidebarSelection) => void
+  onCloseTab: (path: string) => void
+  onSwitchTab: (path: string) => void
+  onReplaceActiveTab: (entry: VaultEntry) => void
+  onSelectNote: (entry: VaultEntry) => void
+}
+
+/** Sets up keyboard shortcuts, command registry, and keyboard navigation. */
+export function useAppCommands(config: AppCommandsConfig): CommandAction[] {
+  useAppKeyboard({
+    onQuickOpen: config.onQuickOpen,
+    onCommandPalette: config.onCommandPalette,
+    onCreateNote: config.onCreateNote,
+    onSave: config.onSave,
+    onOpenSettings: config.onOpenSettings,
+    onTrashNote: config.onTrashNote,
+    onArchiveNote: config.onArchiveNote,
+    onSetViewMode: config.onSetViewMode,
+    activeTabPathRef: config.activeTabPathRef,
+    handleCloseTabRef: config.handleCloseTabRef,
+  })
+
+  const commands = useCommandRegistry({
+    activeTabPath: config.activeTabPath,
+    entries: config.entries,
+    modifiedCount: config.modifiedCount,
+    onQuickOpen: config.onQuickOpen,
+    onCreateNote: config.onCreateNote,
+    onSave: config.onSave,
+    onOpenSettings: config.onOpenSettings,
+    onTrashNote: config.onTrashNote,
+    onArchiveNote: config.onArchiveNote,
+    onUnarchiveNote: config.onUnarchiveNote,
+    onCommitPush: config.onCommitPush,
+    onSetViewMode: config.onSetViewMode,
+    onToggleInspector: config.onToggleInspector,
+    onSelect: config.onSelect,
+    onCloseTab: config.onCloseTab,
+  })
+
+  useKeyboardNavigation({
+    tabs: config.tabs,
+    activeTabPath: config.activeTabPath,
+    entries: config.entries,
+    selection: config.selection,
+    allContent: config.allContent,
+    onSwitchTab: config.onSwitchTab,
+    onReplaceActiveTab: config.onReplaceActiveTab,
+    onSelectNote: config.onSelectNote,
+  })
+
+  return commands
+}