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/session-manager.tsx

@@ -17,8 +17,8 @@ import {
   Check,
   X,
   ArchiveRestore,
-  Loader2,
 } from 'lucide-react';
+import { Spinner } from '@/components/ui/spinner';
 import { cn } from '@/lib/utils';
 import type { SessionListItem } from '@/types/electron';
 import { useKeyboardShortcutsConfig } from '@/hooks/use-keyboard-shortcuts';
@@ -475,7 +475,7 @@ export function SessionManager({
                       {/* Show loading indicator if this session is running (either current session thinking or any session in runningSessions) */}
                       {(currentSessionId === session.id && isCurrentSessionThinking) ||
                       runningSessions.has(session.id) ? (
-                        <Loader2 className="w-4 h-4 text-primary animate-spin shrink-0" />
+                        <Spinner size="sm" className="shrink-0" />
                       ) : (
                         <MessageSquare className="w-4 h-4 text-muted-foreground shrink-0" />
                       )}