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

static/hyperscript/zoom._hs

@@ -0,0 +1,113 @@
+-- File: zoom._hs
+-- Purpose: Zoom control helper functions
+-- Last Updated: 2025-11-30
+
+-- ==============================================================================
+-- ZOOM SLIDER INPUT HANDLER
+-- ==============================================================================
+-- Called from zoom-slider input event to update zoom level
+def handleZoomInput(slider)
+  set zoomValue to slider.value as a Number
+  set zoomLevel to zoomValue / 100
+
+  -- Update display
+  set valueEl to document.getElementById('zoom-value-current')
+  if valueEl is not null
+    put zoomValue into valueEl
+  end
+  set slider's @aria-valuenow to zoomValue
+  set slider's @aria-valuetext to `${zoomValue}%`
+
+  -- Toggle reset button class
+  set resetBtn to document.getElementById('zoom-reset')
+  if resetBtn is not null
+    if zoomValue is not 100
+      add .zoom-not-default to resetBtn
+    else
+      remove .zoom-not-default from resetBtn
+    end
+  end
+
+  -- Apply zoom to wrapper
+  set wrapper to document.getElementById('zoom-wrapper')
+  if wrapper is not null
+    set wrapper's *zoom to zoomLevel
+    -- Handle width for zoom > 100%
+    if zoomLevel > 1
+      set wrapper's *width to 'auto'
+      set wrapper's *minWidth to '100%'
+      set wrapper's *maxWidth to 'none'
+    else
+      set wrapper's *width to ''
+      set wrapper's *minWidth to ''
+      set wrapper's *maxWidth to ''
+    end
+  end
+
+  -- Save to localStorage
+  set localStorage['cv-zoom'] to zoomValue
+end
+
+-- ==============================================================================
+-- ZOOM RESET HANDLER
+-- ==============================================================================
+-- Called from reset button to reset zoom to 100%
+def handleZoomReset()
+  set slider to document.getElementById('zoom-slider')
+  if slider is not null
+    set slider.value to 100
+    call handleZoomInput(slider)
+    call slider.focus()
+  end
+end
+
+-- ==============================================================================
+-- ZOOM CONTROL VISIBILITY
+-- ==============================================================================
+-- Initialize zoom control visibility on load
+def initZoomControl(control)
+  -- Skip on mobile
+  if window.innerWidth <= 768
+    exit
+  end
+
+  -- Load saved zoom level
+  set savedZoom to localStorage.getItem('cv-zoom')
+  set slider to document.getElementById('zoom-slider')
+  if savedZoom and slider
+    set slider.value to savedZoom
+    call handleZoomInput(slider)
+  end
+
+  -- Check visibility preference
+  set isVisible to localStorage.getItem('cv-zoom-visible')
+  if isVisible is 'true'
+    remove .zoom-hidden from control
+    set menuBtn to document.getElementById('show-zoom-menu-btn')
+    if menuBtn is not null
+      add .zoom-hidden to menuBtn
+    end
+  end
+
+  -- Load saved position
+  set savedPos to localStorage.getItem('cv-zoom-position')
+  if savedPos
+    set pos to JSON.parse(savedPos)
+    set control's *bottom to pos.bottom
+    set control's *left to pos.left
+    set control's *transform to 'none'
+  end
+end
+
+-- ==============================================================================
+-- ZOOM CLOSE HANDLER
+-- ==============================================================================
+-- Called when clicking the close button on zoom control
+def handleZoomClose(control)
+  add .zoom-hidden to control
+  set localStorage['cv-zoom-visible'] to 'false'
+  set menuBtn to document.getElementById('show-zoom-menu-btn')
+  if menuBtn is not null
+    remove .zoom-hidden from menuBtn
+  end
+end