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/github-prs-view.tsx

@@ -5,7 +5,8 @@
  */
 
 import { useState, useCallback } from 'react';
-import { GitPullRequest, Loader2, RefreshCw, ExternalLink, GitMerge, X } from 'lucide-react';
+import { GitPullRequest, RefreshCw, ExternalLink, GitMerge, X } from 'lucide-react';
+import { Spinner } from '@/components/ui/spinner';
 import { getElectronAPI, type GitHubPR } from '@/lib/electron';
 import { useAppStore } from '@/store/app-store';
 import { Button } from '@/components/ui/button';
@@ -63,7 +64,7 @@ export function GitHubPRsView() {
   if (loading) {
     return (
       <div className="flex-1 flex items-center justify-center">
-        <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
+        <Spinner size="xl" />
       </div>
     );
   }
@@ -113,7 +114,7 @@ export function GitHubPRsView() {
             </div>
           </div>
           <Button variant="outline" size="sm" onClick={handleRefresh} disabled={refreshing}>
-            <RefreshCw className={cn('h-4 w-4', refreshing && 'animate-spin')} />
+            {refreshing ? <Spinner size="sm" /> : <RefreshCw className="h-4 w-4" />}
           </Button>
         </div>