Implement TUI pane navigation

memory-bank/activeContext.md

@@ -2,8 +2,8 @@
 
 ## Current Work Focus
 
-**Status**: Phase 2 In Progress - Basic TUI prototype implemented
-**Priority**: Expand Bubble Tea TUI with navigation and view features
+**Status**: Phase 2 Complete - Basic TUI prototype finished
+**Priority**: Begin Phase 3 - Edit mode and file integration
 
 ## Recent Changes
 
@@ -17,6 +17,12 @@
 - ✅ **Comprehensive testing**: 54 comprehensive tests covering all parser functionality (100% passing)
 - ✅ **Demo application**: Full showcase of parser capabilities with real-world examples
 
+### Phase 2: TUI Prototype (COMPLETED) ✅
+- ✅ **Two-pane layout** with list and detail panes
+- ✅ **Navigation system** with pane switching and detail scrolling
+- ✅ **View mode** showing entry details and status bar
+- ✅ **Parser integration** loading `/etc/hosts` into the UI
+
 ### Parser Capabilities Achieved
 - ✅ **Standard entries**: IPv4, IPv6, multiple aliases, inline comments
 - ✅ **Disabled entries**: Commented lines with `# IP hostname` format detection
@@ -35,33 +41,14 @@
 
 ## Next Steps
 
-### Immediate (Phase 2 - Current Priority)
-1. **TUI Architecture Design** ✅
-   - Main Bubble Tea model with list and detail panes
-   - State tracks selection and window size
-
-2. **Two-Pane Layout Implementation** ✅
-   - Left pane: entry list using Bubbles list component
-   - Right pane: detail view of selected entry
-   - Responsive sizing handled in update
-
-3. **Navigation System** 🟡
-   - Basic keyboard navigation via list component
-   - Need scroll handling and pane switching
-
-4. **View Mode Implementation** 🟡
-   - Read-only display of `/etc/hosts` entries
-   - Status bar and active/inactive indicators in list implemented
-   - Further styling improvements pending
-
-### Medium-term (Phase 3)
+### Immediate (Phase 3 - Current Priority)
 1. **Edit Mode Implementation**
    - Explicit mode transition with visual indicators
    - Permission handling with sudo request
    - Entry modification forms with validation
 
 2. **File Integration**
-   - Connect TUI with existing parser functionality
+   - Connect TUI with existing parser functionality for writes
    - Real-time display of actual `/etc/hosts` content
    - Live validation and formatting preview
 

memory-bank/progress.md

@@ -44,13 +44,13 @@
 
 ## What's Left to Build
 
-### 🎨 Basic TUI (Phase 2 - Current Priority)
+### 🎨 Basic TUI (Phase 2 - Completed)
 - [x] **Main Bubble Tea model**: Core application state and structure
 - [x] **Two-pane layout**: Left list + right detail view
 - [x] **Entry list display**: Show IP and hostname columns
 - [x] **Entry selection**: Navigate and select entries with keyboard
- - [x] **View mode**: Safe browsing with status bar and active/inactive indicators
- - [ ] **Integration**: Connect TUI with existing parser functionality
+- [x] **View mode**: Safe browsing with status bar and active/inactive indicators
+- [x] **Integration**: Connect TUI with existing parser functionality
 
 ### 🔧 Edit Functionality (Phase 3)
 - [ ] **Edit mode transition**: Explicit mode switching with visual indicators
@@ -74,9 +74,9 @@
 
 ## Current Status
 
-### Project Phase: **Phase 1 Complete → Phase 2 (TUI Implementation)**
-- **Completion**: ~65% (foundation and complete core parser functionality implemented)
-- **Active work**: Ready to implement Bubble Tea TUI with two-pane layout (Phase 2)
+### Project Phase: **Phase 2 Complete → Phase 3 (Edit Mode Implementation)**
+- **Completion**: ~75% (parser and basic TUI implemented)
+- **Active work**: Begin edit mode and file integration (Phase 3)
 - **Blockers**: None - comprehensive parser foundation with 54 tests completed
 - **Parser status**: Production-ready with all safety features implemented
 
@@ -132,10 +132,10 @@
 ## Success Metrics & Milestones
 
 ### Milestone 1: Basic Functionality (Target: Week 1)
-- [ ] Parse and display existing hosts file entries
-- [ ] Navigate entries with keyboard
-- [ ] View entry details in right pane
-- **Success criteria**: Can safely browse hosts file without editing
+- [x] Parse and display existing hosts file entries
+- [x] Navigate entries with keyboard
+- [x] View entry details in right pane
+- **Success criteria**: Can safely browse hosts file without editing (achieved)
 
 ### Milestone 2: Core Editing (Target: Week 2)  
 - [ ] Toggle entries active/inactive
@@ -179,15 +179,14 @@
 19. ✅ **Verify atomic operations** (temp files with rollback for safe writes)
 20. ✅ **Complete parser documentation** (comprehensive demo showing all capabilities)
 
-### 🚧 NEXT Phase 2 Actions (TUI Implementation)
-1. **Design TUI architecture** following Bubble Tea MVU pattern
-2. **Create main application model** with state management
-3. **Implement two-pane layout** (entry list + detail view)
-4. **Add navigation controls** (keyboard-driven interaction)
-5. **Integrate parser functionality** with TUI display
-6. **Implement view mode** (safe browsing without modifications)
+### 🚧 NEXT Phase 3 Actions (Edit Mode & File Integration)
+1. **Edit mode transition** with explicit mode switching
+2. **Permission handling** requesting sudo when entering edit mode
+3. **Entry modification** forms for add/edit/delete/toggle
+4. **File writing** with backups and atomic updates
+5. **Input validation** in real time
 
-**Phase 1 is fully complete with a production-ready parser foundation.**
+**Phase 2 delivered a functional view-only TUI.**
 
 ### Parser Achievement Summary
 - **54 comprehensive tests** covering all hosts file variations and edge cases
@@ -197,4 +196,4 @@
 - **Search and management** capabilities for finding and manipulating entries
 - **Demo application** showcasing all functionality with realistic examples
 
-The foundation is robust, tested, and ready for TUI implementation in Phase 2.
+The foundation is robust, tested, and ready for edit mode implementation in Phase 3.