fix: 登录后 showToast 未导入导致欢迎提示崩溃；顺带清除 auth.ts 死代码，补充 vue-tsc 类型工具

intern-log/src/App.vue

@@ -14,7 +14,7 @@ import { getSession, logoutUser, openUserDatabase, type Session } from './db/aut
 import { autoSyncNow, enableRealtimeSync, ensureCloudBinding, stopRealtime } from './sync/engine'
 import { clockIn, getAttendance, getWorkRule, getWeeklyNote, searchLogItems, searchMemos, smartClockOut, type WorkRule } from './db/repo'
 import { addDays, hhmm, todayStr, weekStart } from './lib/date'
-import { useToasts } from './lib/toast'
+import { showToast, useToasts } from './lib/toast'
 import { attendanceChanged, focusDate, focusMemo, notifyAttendanceChanged } from './lib/bus'
 import { categoryLabel, type Attendance, type LogItem, type Memo } from './db/schema'
 

intern-log/src/db/auth.ts

@@ -95,7 +95,6 @@ export async function createUser(username: string, password: string, migrateLega
   const session: Session = { userId: id, username: name }
   setSession(session)
   setCloudCreds(session.username, password)
-  if (copied) showToastCopied(copied)
   return session
 }