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/codex/codex-usage-section.tsx

@@ -1,4 +1,5 @@
 import { Button } from '@/components/ui/button';
+import { Spinner } from '@/components/ui/spinner';
 import { RefreshCw, AlertCircle } from 'lucide-react';
 import { OpenAIIcon } from '@/components/ui/provider-icon';
 import { cn } from '@/lib/utils';
@@ -124,7 +125,7 @@ export function CodexUsageSection() {
             data-testid="refresh-codex-usage"
             title={CODEX_REFRESH_LABEL}
           >
-            <RefreshCw className={cn('w-4 h-4', isFetching && 'animate-spin')} />
+            {isFetching ? <Spinner size="sm" /> : <RefreshCw className="w-4 h-4" />}
           </Button>
         </div>
         <p className="text-sm text-muted-foreground/80 ml-12">{CODEX_USAGE_SUBTITLE}</p>