Implement Phase 1: Complete static HTML structure with enhanced UI elements

docs/dev-plan.md

@@ -51,17 +51,25 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
 
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-### **Phase 1: Static HTML Structure**
+### **Phase 1: Static HTML Structure** ✅ **COMPLETE**
 **Goal**: Basic three-panel layout with placeholder content
 
-- [ ] Create `index.html` with basic structure
-- [ ] Add minimal CSS for three-column flexbox layout
-- [ ] Add placeholder divs for: snippet list, editor, preview
-- [ ] Add vertical toggle button strip on far right (3 buttons)
-- [ ] Test that layout renders at correct proportions
+- [x] Create `index.html` with basic structure
+- [x] Add minimal CSS for three-column flexbox layout
+- [x] Add placeholder divs for: snippet list, editor, preview
+- [x] Add vertical toggle button strip (moved to left side with emoji icons)
+- [x] Test that layout renders at correct proportions
 
 **Deliverable**: Static page with three visible sections + toggle buttons
 
+**Additional Enhancements Made**:
+- Added header with site branding (🔭 Astrolabe) and quick action links
+- Applied retro Windows 2000 aesthetic with square edges and classic colors
+- Implemented basic toggle functionality for show/hide panels
+- Added snippet selection highlighting
+- Used emoji icons for better UX (📄 ✏️ 👁️)
+- Optimized font sizes for better readability
+
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 ### **Phase 2: Resizable Panels**
@@ -260,5 +268,5 @@ Astrolabe is a focused tool for managing, editing, and previewing Vega-Lite visu
 
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-**Current Phase**: Phase 1 - Static HTML Structure
+**Current Phase**: Phase 2 - Resizable Panels
 **Status**: Ready to begin implementation