chore: 清理 src 下 33 项死代码和类型断言

删除未使用的文件/目录（mcp/adapter、cli/update.ts 等）、
未使用的重导出文件（design-system/color.ts 等 12 个）、
7 个零引用的导出函数、修复 5 处 as any 为精确类型。
净减少 ~1194 行代码，precheck 4077 测试全部通过。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/hooks/fileSuggestions.ts

@@ -387,13 +387,7 @@ async function getFilesUsingGit(
  * For example, if the input is ['src/index.js', 'src/utils/helpers.js'],
  * the output will be ['src/', 'src/utils/'].
  * @param files An array of file paths
- * @returns An array of unique directory names with a trailing separator
  */
-export function getDirectoryNames(files: string[]): string[] {
-  const directoryNames = new Set<string>()
-  collectDirectoryNames(files, 0, files.length, directoryNames)
-  return [...directoryNames].map(d => d + path.sep)
-}
 
 /**
  * Async variant: yields every ~10k files so 270k+ file lists don't block

src/hooks/notifs/useAutoModeUnavailableNotification.ts

@@ -1,56 +0,0 @@
-import { feature } from 'bun:bundle'
-import { useEffect, useRef } from 'react'
-import { useNotifications } from 'src/context/notifications.js'
-import { getIsRemoteMode } from '../../bootstrap/state.js'
-import { useAppState } from '../../state/AppState.js'
-import type { PermissionMode } from '../../utils/permissions/PermissionMode.js'
-import {
-  getAutoModeUnavailableNotification,
-  getAutoModeUnavailableReason,
-} from '../../utils/permissions/permissionSetup.js'
-import { hasAutoModeOptIn } from '../../utils/settings/settings.js'
-
-/**
- * Shows a one-shot notification when the shift-tab carousel wraps past where
- * auto mode would have been. Covers all reasons (settings, circuit-breaker,
- * org-allowlist). The startup case (defaultMode: auto silently downgraded) is
- * handled by verifyAutoModeGateAccess → checkAndDisableAutoModeIfNeeded.
- */
-export function useAutoModeUnavailableNotification(): void {
-  const { addNotification } = useNotifications()
-  const mode = useAppState(s => s.toolPermissionContext.mode)
-  const isAutoModeAvailable = useAppState(
-    s => s.toolPermissionContext.isAutoModeAvailable,
-  )
-  const shownRef = useRef(false)
-  const prevModeRef = useRef<PermissionMode>(mode)
-
-  useEffect(() => {
-    const prevMode = prevModeRef.current
-    prevModeRef.current = mode
-
-    if (!feature('TRANSCRIPT_CLASSIFIER')) return
-    if (getIsRemoteMode()) return
-    if (shownRef.current) return
-
-    const wrappedPastAutoSlot =
-      mode === 'default' &&
-      prevMode !== 'default' &&
-      prevMode !== 'auto' &&
-      !isAutoModeAvailable &&
-      hasAutoModeOptIn()
-
-    if (!wrappedPastAutoSlot) return
-
-    const reason = getAutoModeUnavailableReason()
-    if (!reason) return
-
-    shownRef.current = true
-    addNotification({
-      key: 'auto-mode-unavailable',
-      text: getAutoModeUnavailableNotification(reason),
-      color: 'warning',
-      priority: 'medium',
-    })
-  }, [mode, isAutoModeAvailable, addNotification])
-}