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/codex-usage-popover.tsx

@@ -2,6 +2,7 @@ import { useState, useMemo } from 'react';
 import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
 import { Button } from '@/components/ui/button';
 import { RefreshCw, AlertTriangle, CheckCircle, XCircle, Clock, ExternalLink } from 'lucide-react';
+import { Spinner } from '@/components/ui/spinner';
 import { cn } from '@/lib/utils';
 import { useSetupStore } from '@/store/setup-store';
 import { useCodexUsage } from '@/hooks/queries';
@@ -273,7 +274,7 @@ export function CodexUsagePopover() {
           ) : !codexUsage ? (
             // Loading state
             <div className="flex flex-col items-center justify-center py-8 space-y-2">
-              <RefreshCw className="w-6 h-6 animate-spin text-muted-foreground/50" />
+              <Spinner size="lg" />
               <p className="text-xs text-muted-foreground">Loading usage data...</p>
             </div>
           ) : codexUsage.rateLimits ? (