fix(ui): add loading spinners and toast feedback to create/update modals

- TeamMembersDialog: Loader2 spinner on add/remove, toast on success/error
- TeamCreateDialog: Loader2 spinner on create button
- TeamSettingsTab: Loader2 spinner on save button (was text-only)
- ProviderFormDialog: Loader2 spinner on save/create button
- Add i18n keys for member add/remove toast (en/vi/zh)

ui/web/src/i18n/locales/en/teams.json

@@ -42,6 +42,10 @@
     "searchAgents": "Search agents...",
     "adding": "Adding...",
     "add": "Add",
+    "added": "Member added",
+    "failedAdd": "Failed to add member",
+    "removed": "Member removed",
+    "failedRemove": "Failed to remove member",
     "removeMember": "Remove member",
     "columns": {
       "agent": "Agent",

ui/web/src/i18n/locales/vi/teams.json

@@ -42,6 +42,10 @@
     "searchAgents": "Tìm kiếm agent...",
     "adding": "Đang thêm...",
     "add": "Thêm",
+    "added": "Đã thêm thành viên",
+    "failedAdd": "Thêm thành viên thất bại",
+    "removed": "Đã xóa thành viên",
+    "failedRemove": "Xóa thành viên thất bại",
     "removeMember": "Xóa thành viên",
     "columns": {
       "agent": "Agent",

ui/web/src/i18n/locales/zh/teams.json

@@ -42,6 +42,10 @@
     "searchAgents": "搜索Agent...",
     "adding": "添加中...",
     "add": "添加",
+    "added": "成员已添加",
+    "failedAdd": "添加成员失败",
+    "removed": "成员已移除",
+    "failedRemove": "移除成员失败",
     "removeMember": "移除成员",
     "columns": {
       "agent": "Agent",

ui/web/src/pages/providers/provider-form-dialog.tsx

@@ -26,6 +26,7 @@ import { PROVIDER_TYPES } from "@/constants/providers";
 import { OAuthSection } from "./provider-oauth-section";
 import { CLISection } from "./provider-cli-section";
 import { ACPSection } from "./provider-acp-section";
+import { Loader2 } from "lucide-react";
 
 interface ProviderFormDialogProps {
   open: boolean;
@@ -293,7 +294,9 @@ export function ProviderFormDialog({ open, onOpenChange, provider, onSubmit, exi
             <Button
               onClick={handleSubmit}
               disabled={!name.trim() || !isValidSlug(name) || !providerType || loading}
+              className="gap-1"
             >
+              {loading && <Loader2 className="h-3.5 w-3.5 animate-spin" />}
               {loading
                 ? (isEdit ? t("form.saving") : t("form.creating"))
                 : isEdit ? t("form.save") : t("form.create")}

ui/web/src/pages/teams/board/team-members-dialog.tsx

@@ -5,9 +5,10 @@ import {
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Combobox } from "@/components/ui/combobox";
-import { Bot, UserPlus, X } from "lucide-react";
+import { Bot, UserPlus, X, Loader2 } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import { useAgents } from "@/pages/agents/hooks/use-agents";
+import { toast } from "@/stores/use-toast-store";
 import type { TeamMemberData } from "@/types/team";
 
 interface TeamMembersDialogProps {
@@ -67,6 +68,8 @@ export function TeamMembersDialog({
     [members],
   );
 
+  const [removing, setRemoving] = useState<string | null>(null);
+
   const handleAdd = async () => {
     if (!selected) return;
     setAdding(true);
@@ -74,8 +77,24 @@ export function TeamMembersDialog({
       await onAddMember(selected, "member");
       setSelected("");
       setShowAdd(false);
-    } catch { /* handled upstream */ }
-    finally { setAdding(false); }
+      toast.success(t("members.added"));
+    } catch {
+      toast.error(t("members.failedAdd"));
+    } finally {
+      setAdding(false);
+    }
+  };
+
+  const handleRemove = async (agentId: string) => {
+    setRemoving(agentId);
+    try {
+      await onRemoveMember(agentId);
+      toast.success(t("members.removed"));
+    } catch {
+      toast.error(t("members.failedRemove"));
+    } finally {
+      setRemoving(null);
+    }
   };
 
   return (
@@ -104,7 +123,8 @@ export function TeamMembersDialog({
                 placeholder={t("members.searchAgents")}
               />
             </div>
-            <Button size="sm" className="h-9 shrink-0" disabled={!selected || adding} onClick={handleAdd}>
+            <Button size="sm" className="h-9 shrink-0 gap-1" disabled={!selected || adding} onClick={handleAdd}>
+              {adding && <Loader2 className="h-3.5 w-3.5 animate-spin" />}
               {t("members.add")}
             </Button>
           </div>
@@ -139,10 +159,11 @@ export function TeamMembersDialog({
               </div>
               {m.role !== "lead" && (
                 <button
-                  className="mt-0.5 shrink-0 cursor-pointer text-muted-foreground opacity-0 transition-opacity hover:text-destructive group-hover:opacity-100"
-                  onClick={() => onRemoveMember(m.agent_id)}
+                  className="mt-0.5 shrink-0 cursor-pointer text-muted-foreground opacity-0 transition-opacity hover:text-destructive group-hover:opacity-100 disabled:opacity-50"
+                  onClick={() => handleRemove(m.agent_id)}
+                  disabled={removing === m.agent_id}
                 >
-                  <X className="h-4 w-4" />
+                  {removing === m.agent_id ? <Loader2 className="h-4 w-4 animate-spin" /> : <X className="h-4 w-4" />}
                 </button>
               )}
             </div>

ui/web/src/pages/teams/team-create-dialog.tsx

@@ -11,7 +11,7 @@ import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { Combobox } from "@/components/ui/combobox";
 import { Badge } from "@/components/ui/badge";
-import { X, Info } from "lucide-react";
+import { X, Info, Loader2 } from "lucide-react";
 import {
   Tooltip,
   TooltipContent,
@@ -199,7 +199,8 @@ export function TeamCreateDialog({ open, onOpenChange, onCreate }: TeamCreateDia
           <Button variant="outline" onClick={() => onOpenChange(false)} disabled={loading}>
             {t("create.cancel")}
           </Button>
-          <Button onClick={handleCreate} disabled={!name.trim() || !leadOptions.some((o) => o.value === lead) || loading}>
+          <Button onClick={handleCreate} disabled={!name.trim() || !leadOptions.some((o) => o.value === lead) || loading} className="gap-1">
+            {loading && <Loader2 className="h-3.5 w-3.5 animate-spin" />}
             {loading ? t("create.creating") : t("create.create")}
           </Button>
         </DialogFooter>

ui/web/src/pages/teams/team-settings-tab.tsx

@@ -3,7 +3,7 @@ import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Switch } from "@/components/ui/switch";
 import { Combobox } from "@/components/ui/combobox";
-import { X, Save, Check, Bell, ShieldAlert, Clock, Info, FolderLock, FolderSync, Zap, Bot } from "lucide-react";
+import { X, Save, Check, Bell, ShieldAlert, Clock, Info, FolderLock, FolderSync, Zap, Bot, Loader2 } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import { CHANNEL_TYPES } from "@/constants/channels";
 import type { TeamData, TeamAccessSettings, EscalationMode, EscalationAction } from "@/types/team";
@@ -449,7 +449,9 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
       <div className="flex items-center gap-3">
         <Button onClick={handleSave} disabled={saving} className="gap-2">
           {saving ? (
-            t("settings.saving")
+            <>
+              <Loader2 className="h-4 w-4 animate-spin" /> {t("settings.saving")}
+            </>
           ) : saved ? (
             <>
               <Check className="h-4 w-4" /> {t("settings.saved")}