Refactor, theme and speed improvements

.cursor/worktrees.json

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+{
+  "setup-worktree": [
+    "npm install"
+  ]
+}

ARCHITECTURE_REFACTOR_COMPLETE.md

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+# CLI Architecture Refactor - Complete ✅
+
+## Date: October 24, 2025
+
+## Summary
+
+Successfully refactored the CLI application from a memory-leaking multi-instance pattern to a **single persistent Ink app** with proper state management and navigation.
+
+## What Was Done
+
+### Phase 1: Dependencies & Infrastructure ✅
+
+**Added:**
+- `zustand` v5.0.2 for state management
+
+**Created:**
+- `src/store/navigationStore.ts` - Navigation state with stack-based routing
+- `src/store/devboxStore.ts` - Devbox list state with pagination and caching
+- `src/store/blueprintStore.ts` - Blueprint list state
+- `src/store/snapshotStore.ts` - Snapshot list state
+- `src/store/index.ts` - Root store exports
+
+### Phase 2: API Service Layer ✅
+
+**Created:**
+- `src/services/devboxService.ts` - Centralized API calls for devboxes
+- `src/services/blueprintService.ts` - Centralized API calls for blueprints
+- `src/services/snapshotService.ts` - Centralized API calls for snapshots
+
+**Key Features:**
+- Defensive copying of API responses to break references
+- Plain data returns (no SDK object retention)
+- Explicit nullification to aid garbage collection
+
+### Phase 3: Router Infrastructure ✅
+
+**Created:**
+- `src/router/types.ts` - Screen types and route interfaces
+- `src/router/Router.tsx` - Stack-based router with memory cleanup
+
+**Features:**
+- Single screen component mounted at a time
+- Automatic store cleanup on route changes
+- Memory monitoring integration
+- 100ms cleanup delay to allow unmount
+
+### Phase 4: Screen Components ✅
+
+**Created:**
+- `src/screens/MenuScreen.tsx` - Main menu wrapper
+- `src/screens/DevboxListScreen.tsx` - Pure UI component using devboxStore
+- `src/screens/DevboxDetailScreen.tsx` - Detail view wrapper
+- `src/screens/DevboxActionsScreen.tsx` - Actions menu wrapper
+- `src/screens/DevboxCreateScreen.tsx` - Create form wrapper
+- `src/screens/BlueprintListScreen.tsx` - Blueprint list wrapper
+- `src/screens/SnapshotListScreen.tsx` - Snapshot list wrapper
+
+**Key Improvements:**
+- DevboxListScreen is fully refactored with store-based state
+- No useState/useRef for heavy data
+- React.memo for performance
+- Clean mount/unmount lifecycle
+- All operations use navigation store
+
+### Phase 5: Wiring & Integration ✅
+
+**Updated:**
+- `src/commands/menu.tsx` - Now uses Router component and screen registry
+- Screen names changed: `"devboxes"` → `"devbox-list"`, etc.
+- SSH flow updated to return to `"devbox-list"` after session
+
+**Pattern:**
+```typescript
+// Before: Multiple Ink instances per screen
+render(<ListDevboxesUI ... />); // New instance
+
+// After: Single Ink instance, router switches screens
+<Router screens={{ "devbox-list": DevboxListScreen, ... }} />
+```
+
+### Phase 6: Memory Management ✅
+
+**Created:**
+- `src/utils/memoryMonitor.ts` - Development memory tracking
+
+**Features:**
+- `logMemoryUsage(label)` - Logs heap usage with deltas
+- `getMemoryPressure()` - Returns low/medium/high
+- `shouldTriggerGC()` - Detects when GC is needed
+- Enabled with `NODE_ENV=development` or `DEBUG_MEMORY=1`
+
+**Enhanced:**
+- Router with memory logging on route changes
+- Store cleanup with 100ms delay
+- Context-aware cleanup (stays in devbox context → keeps cache)
+
+### Phase 7: Testing & Validation 🔄
+
+**Ready for:**
+- Rapid screen transitions (list → detail → actions → back × 100)
+- Memory monitoring: `DEBUG_MEMORY=1 npm start`
+- SSH flow testing
+- All list commands (devbox, blueprint, snapshot)
+
+## Architecture Comparison
+
+### Before (Memory Leak Pattern)
+
+```
+CLI Entry → Multiple Ink Instances
+              ↓
+        CommandExecutor.executeList()
+              ↓
+        New React Tree Per Screen
+              ↓
+        Heavy State in Components
+              ↓
+        Direct SDK Calls
+              ↓
+        🔴 Objects Retained, Heap Exhaustion
+```
+
+### After (Single Instance Pattern)
+
+```
+CLI Entry → Single Ink Instance
+              ↓
+            Router
+              ↓
+        Screen Components (Pure UI)
+              ↓
+        State Stores (Zustand)
+              ↓
+        API Services
+              ↓
+        ✅ Clean Unmount, Memory Freed
+```
+
+## Key Benefits
+
+1. **Memory Stability**: Expected reduction from 4GB heap exhaustion to ~200-400MB sustained
+2. **Clean Lifecycle**: Components mount/unmount properly, freeing memory
+3. **Single Source of Truth**: State lives in stores, not scattered across components
+4. **No Recursion**: Stack-based navigation, not recursive function calls
+5. **Explicit Cleanup**: Stores have cleanup methods called by router
+6. **Monitoring**: Built-in memory tracking for debugging
+7. **Maintainability**: Clear separation of concerns (UI, State, API)
+
+## File Structure
+
+```
+src/
+├── store/
+│   ├── index.ts
+│   ├── navigationStore.ts
+│   ├── devboxStore.ts
+│   ├── blueprintStore.ts
+│   └── snapshotStore.ts
+├── services/
+│   ├── devboxService.ts
+│   ├── blueprintService.ts
+│   └── snapshotService.ts
+├── router/
+│   ├── types.ts
+│   └── Router.tsx
+├── screens/
+│   ├── MenuScreen.tsx
+│   ├── DevboxListScreen.tsx
+│   ├── DevboxDetailScreen.tsx
+│   ├── DevboxActionsScreen.tsx
+│   ├── DevboxCreateScreen.tsx
+│   ├── BlueprintListScreen.tsx
+│   └── SnapshotListScreen.tsx
+├── utils/
+│   └── memoryMonitor.ts
+└── commands/
+    └── menu.tsx (refactored to use Router)
+```
+
+## Breaking Changes
+
+### Screen Names
+- `"devboxes"` → `"devbox-list"`
+- `"blueprints"` → `"blueprint-list"`
+- `"snapshots"` → `"snapshot-list"`
+
+### Navigation API
+```typescript
+// Before
+setShowDetails(true);
+
+// After
+push("devbox-detail", { devboxId: "..." });
+```
+
+### State Access
+```typescript
+// Before
+const [devboxes, setDevboxes] = useState([]);
+
+// After
+const devboxes = useDevboxStore((state) => state.devboxes);
+```
+
+## Testing Instructions
+
+### Memory Monitoring
+```bash
+# Enable memory logging
+DEBUG_MEMORY=1 npm start
+
+# Test rapid transitions
+# Navigate: devbox list → detail → actions → back
+# Repeat 100 times
+# Watch for: Stable memory, no heap exhaustion
+```
+
+### Functional Testing
+```bash
+# Test all navigation paths
+npm start
+# → Select "Devboxes"
+# → Select a devbox
+# → Press "a" for actions
+# → Test each operation
+# → Press Esc to go back
+# → Press "c" to create
+# → Test SSH flow
+```
+
+### Memory Validation
+```bash
+# Before refactor: 4GB heap exhaustion after ~50 transitions
+# After refactor: Stable ~200-400MB sustained
+
+# Look for these logs:
+[MEMORY] Route change: devbox-list → devbox-detail: Heap X/YMB, RSS ZMB
+[MEMORY] Cleared devbox store: Heap X/YMB, RSS ZMB (Δ -AMB)
+```
+
+## Known Limitations
+
+1. **Blueprint/Snapshot screens**: Currently wrappers around old components
+   - These still use old pattern internally
+   - Can be refactored later using DevboxListScreen as template
+
+2. **Menu component**: MainMenu still renders inline
+   - Works fine, but could be refactored to use navigation store directly
+
+3. **Memory monitoring**: Only in development mode
+   - Should not impact production performance
+
+## Future Improvements
+
+1. **Full refactor of blueprint/snapshot lists**
+   - Apply same pattern as DevboxListScreen
+   - Move to stores + services
+
+2. **Better error boundaries**
+   - Add error boundaries around screens
+   - Graceful error recovery
+
+3. **Prefetching**
+   - Prefetch next page while viewing current
+   - Smoother pagination
+
+4. **Persistent cache**
+   - Save cache to disk for faster restarts
+   - LRU eviction policy
+
+5. **Animation/transitions**
+   - Smooth screen transitions
+   - Loading skeletons
+
+## Success Criteria
+
+✅ Build passes without errors
+✅ Single Ink instance running
+✅ Router controls all navigation
+✅ Stores manage all state
+✅ Services handle all API calls
+✅ Memory monitoring in place
+✅ Cleanup on route changes
+
+🔄 **Awaiting manual testing:**
+- Rapid transition test (100x)
+- Memory stability verification
+- SSH flow validation
+- All operations functional
+
+## Rollback Plan
+
+If issues arise, the old components still exist:
+- `src/components/DevboxDetailPage.tsx`
+- `src/components/DevboxActionsMenu.tsx`
+- `src/commands/devbox/list.tsx` (old code commented)
+
+Can revert `menu.tsx` to use old pattern if needed.
+
+## Conclusion
+
+The architecture refactor is **COMPLETE** and ready for testing. The application now follows modern React patterns with proper state management, clean lifecycle, and explicit memory cleanup.
+
+**Expected Impact:**
+- 🎯 Memory: 4GB → 200-400MB
+- 🎯 Stability: Heap exhaustion → Sustained operation
+- 🎯 Maintainability: Significantly improved
+- 🎯 Speed: Slightly faster (no Ink instance creation overhead)
+
+**Next Step:** Run the application and perform Phase 7 testing to validate memory improvements.
+