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

backend/internal/static/dist/assets/refresh-cw-Bst35UPe.js

@@ -0,0 +1 @@
+import{c as e}from"./index-B0FmaMuw.js";const t=e("refresh-cw",[["path",{d:"M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8",key:"v9h5vc"}],["path",{d:"M21 3v5h-5",key:"1q7to0"}],["path",{d:"M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16",key:"3uifl3"}],["path",{d:"M8 16H3v5",key:"1cv678"}]]);export{t as R};