refactor: Major hyperscript refactoring and JS elimination

Inline Hyperscript Refactoring:
- Body tag keyboard handlers: 20→8 lines (using helper functions)
- Zoom control handlers: 85→35 lines (using zoom._hs)
- PDF modal card selection: 90→6 lines (3 identical blocks eliminated)

New Hyperscript Files:
- zoom._hs: handleZoomInput, handleZoomReset, initZoomControl
- pdf-modal._hs: selectPdfCard, handlePdfCardKey

JavaScript Elimination (232 lines removed):
- cv-functions.js: REMOVED - hyperscript defs are globally available
- scroll-at-bottom-handler.js: REMOVED - duplicate of handleScroll()
- footer-buttons-interaction.js: REMOVED - moved to hyperscript

Added Tests:
- 32-hyperscript-multi-src.test.mjs: Verifies multi-file loading
- 33-keyboard-shortcuts-refactored.test.mjs: Keyboard shortcuts
- 34-hyperscript-refactor-comprehensive.test.mjs: Full test suite

Key Findings:
- No hyperscript multi-file bug in 0.9.14
- Hyperscript def statements are globally accessible
- Previous refactoring failures were syntax errors, not library bugs

doc/4-HYPERSCRIPT-RULES.md

@@ -134,8 +134,9 @@ static/hyperscript/
 ├── utils._hs         → Core utilities (scroll, print, etc.)
 ├── toggles._hs       → Toggle functions (CV length, icons, theme)
 ├── hover-sync._hs    → Hover sync functions (PDF, print, zoom)
-├── navigation._hs    → Navigation functions (scroll-to-section) [2025-11-20]
-└── keyboard._hs      → Keyboard handler reference (inline in body tag)
+├── keyboard._hs      → Keyboard shortcut helpers (handleToggleShortcut, openModalShortcut)
+├── zoom._hs          → Zoom control helpers (handleZoomInput, handleZoomReset, initZoomControl)
+└── pdf-modal._hs     → PDF modal helpers (selectPdfCard, handlePdfCardKey)
 ```
 
 ### Load Order in templates/index.html:
@@ -144,7 +145,8 @@ static/hyperscript/
 <script type="text/hyperscript" src="/static/hyperscript/toggles._hs"></script>
 <script type="text/hyperscript" src="/static/hyperscript/hover-sync._hs"></script>
 <script type="text/hyperscript" src="/static/hyperscript/keyboard._hs"></script>
-<script type="text/hyperscript" src="/static/hyperscript/navigation._hs"></script>
+<script type="text/hyperscript" src="/static/hyperscript/zoom._hs"></script>
+<script type="text/hyperscript" src="/static/hyperscript/pdf-modal._hs"></script>
 <script src="https://unpkg.com/hyperscript.org@0.9.14"></script>
 ```
 
@@ -180,20 +182,20 @@ static/hyperscript/
 - Reduces HTML payload size
 - Cleaner separation of concerns
 
-### Hyperscript 0.9.12 Limitation
-- Parser breaks with >3 `def` in single file
-- MUST split into multiple files
-- Each file: ≤3 `def` statements
+### Historical Note: Hyperscript Def Limit
+- **Hyperscript 0.9.12** had a 3-def limit per file (FIXED in 0.9.14+)
+- **Hyperscript 0.9.14+** has NO def limit - tested with 5+ defs
+- Multi-file organization is still recommended for maintainability, not required
 
 ## Common Mistakes to Avoid
 
-❌ **DON'T**: Put all functions in one file if you have >3 defs
-❌ **DON'T**: Write long inline hyperscript in HTML
-❌ **DON'T**: Delete functions to work around the 3-def limit
+❌ **DON'T**: Write long inline hyperscript in HTML (maintainability issue)
+❌ **DON'T**: Try to externalize event handlers that inspect `event.key` or `event.target`
+❌ **DON'T**: Forget to test after refactoring (syntax errors look like bugs)
 
-✅ **DO**: Split functions across multiple .\_hs files
+✅ **DO**: Split functions across multiple .\_hs files for organization
 ✅ **DO**: Keep HTML clean with function calls
-✅ **DO**: Maintain all required functions for clean architecture
+✅ **DO**: Test all keyboard shortcuts after any hyperscript changes
 
 ## Testing After Changes
 
@@ -206,6 +208,21 @@ static/hyperscript/
 
 ## Recent Changes
 
+### 2025-11-30: Major Inline Hyperscript Refactoring
+- ✅ **REFACTORED**: Body tag keyboard handlers → `keyboard._hs` helper functions
+- ✅ **REFACTORED**: Zoom control handlers → `zoom._hs` helper functions
+- ✅ **REFACTORED**: PDF modal card selection (3 identical blocks) → `pdf-modal._hs`
+- ✅ **ADDED**: `zoom._hs` - Zoom control helpers (handleZoomInput, handleZoomReset, initZoomControl)
+- ✅ **ADDED**: `pdf-modal._hs` - PDF modal helpers (selectPdfCard, handlePdfCardKey)
+- ✅ **TESTED**: All functionality verified with comprehensive tests
+
+### 2025-11-30: Multi-File Loading Bug Investigation
+- ✅ **CONFIRMED**: Multiple `<script type="text/hyperscript" src="...">` tags work correctly
+- ✅ **VERIFIED**: No multi-file loading bug in hyperscript 0.9.14
+- ✅ **TESTED**: All 6 external files + inline hyperscript work together seamlessly
+- ✅ **ADDED**: Test `tests/mjs/32-hyperscript-multi-src.test.mjs` for verification
+- 🔍 **FINDING**: Previous refactoring failures were syntax errors, NOT hyperscript bugs
+
 ### 2025-11-20: Event Handler Externalization Guidelines
 - ✅ Added Rule 4: Clear guidelines on what can/cannot be externalized
 - ✅ Navigation handlers successfully externalized (9 links → 1 function)
@@ -215,6 +232,6 @@ static/hyperscript/
 
 ---
 
-**Last Updated**: 2025-11-20
-**Hyperscript Version**: 0.9.14+
+**Last Updated**: 2025-11-30
+**Hyperscript Version**: 0.9.14
 **Status**: MANDATORY - ALWAYS FOLLOW