feat(teams): fix checkbox multi-select and improve batch operations UI

- Fix checkbox binding using :model-value instead of :checked
- Change selectedIds from Set to reactive array for proper Vue reactivity
- Move batch refresh/delete buttons to top bar (matching CardKeysPage layout)
- Buttons show selection count like 'Refresh (2)' when items selected
- Swap position of 'Add Team' and 'Random Invite' buttons
- Remove unused isIndeterminate computed property

frontend/src/api/accounts.ts

@@ -7,6 +7,7 @@ export interface Account {
     is_active: boolean
     seats_in_use: number
     seats_entitled: number
+    active_until?: string
     created_at: string
     updated_at: string
 }
@@ -56,3 +57,18 @@ export function refreshAccount(id: number) {
 export function deleteAccount(id: number) {
     return request.delete(`/api/accounts/delete?id=${id}`)
 }
+
+export interface BatchOperationResponse {
+    success: boolean
+    message?: string
+    success_count?: number
+    failed_count?: number
+}
+
+export function batchDeleteAccounts(ids: number[]) {
+    return request.delete<BatchOperationResponse>('/api/accounts/batch/delete', { data: { ids } })
+}
+
+export function batchRefreshAccounts(ids: number[]) {
+    return request.post<BatchOperationResponse>('/api/accounts/batch/refresh', { ids })
+}

frontend/src/api/invite.ts

@@ -7,7 +7,7 @@ export interface InviteByCardRequest {
 
 export interface Invitation {
     id: number
-    email: string
+    invited_email: string
     account_id: number
     status: string
     created_at: string