Merge branch 'v0.13.0rc' into feat/react-query

Merged latest changes from v0.13.0rc into feat/react-query while preserving
React Query migration. Key merge decisions:

- Kept React Query hooks for data fetching (useRunningAgents, useStopFeature, etc.)
- Added backlog plan handling to running-agents-view stop functionality
- Imported both SkeletonPulse and Spinner for CLI status components
- Used Spinner for refresh buttons across all settings sections
- Preserved isBacklogPlan check in agent-output-modal TaskProgressPanel
- Added handleOpenInIntegratedTerminal to worktree actions while keeping React Query mutations

apps/ui/src/components/views/settings-view/providers/claude-settings-tab/subagents-section.tsx

@@ -14,16 +14,8 @@ import { Label } from '@/components/ui/label';
 import { Switch } from '@/components/ui/switch';
 import { Checkbox } from '@/components/ui/checkbox';
 import { cn } from '@/lib/utils';
-import {
-  Bot,
-  RefreshCw,
-  Loader2,
-  Users,
-  ExternalLink,
-  Globe,
-  FolderOpen,
-  Sparkles,
-} from 'lucide-react';
+import { Bot, RefreshCw, Users, ExternalLink, Globe, FolderOpen, Sparkles } from 'lucide-react';
+import { Spinner } from '@/components/ui/spinner';
 import { useSubagents } from './hooks/use-subagents';
 import { useSubagentsSettings } from './hooks/use-subagents-settings';
 import { SubagentCard } from './subagent-card';
@@ -178,11 +170,7 @@ export function SubagentsSection() {
                 title="Refresh agents from disk"
                 className="gap-1.5 h-7 px-2 text-xs"
               >
-                {isLoadingAgents ? (
-                  <Loader2 className="h-3.5 w-3.5 animate-spin" />
-                ) : (
-                  <RefreshCw className="h-3.5 w-3.5" />
-                )}
+                {isLoadingAgents ? <Spinner size="xs" /> : <RefreshCw className="h-3.5 w-3.5" />}
                 Refresh
               </Button>
             </div>