feat: restore all missing hyperscript toggle and hover sync functions

Added 6 critical hyperscript functions that were lost during parse error fix:
- toggleCVLength(isLong) - Toggle between long/short CV views with localStorage
- toggleIcons(showIcons) - Toggle icon visibility with persistence
- toggleTheme(isClean) - Toggle between default/clean themes
- syncPdfHover(show) - Synchronized hover effects for PDF download buttons
- syncPrintHover(show) - Synchronized hover effects for print buttons
- highlightZoomControl(show) - Highlight zoom control on interaction

All functions use hyperscript 0.9.12 compatible syntax (no 'else' blocks).
Each toggle function syncs between action bar and menu checkboxes.

Verified:
- Zero parse errors in browser console
- All 9 hyperscript functions properly defined
- File grew from 134 to 250 lines (+87%)
- Compatible with existing HTML templates

static/hyperscript/functions._hs

@@ -126,6 +126,123 @@ def handleScroll()
   set :lastScroll to currentScroll
 end
 
+-- ==============================================================================
+-- TOGGLE FUNCTIONS
+-- ==============================================================================
+
+def toggleCVLength(isLong)
+  set paper to the first .cv-paper
+  set lengthCheckbox to the first #cv-length-toggle
+  set menuLengthCheckbox to the first #menu-cv-length-toggle
+
+  -- Update DOM state
+  if isLong is true
+    remove .cv-short from paper
+    add .cv-long to paper
+    set lengthCheckbox's checked to true
+    set menuLengthCheckbox's checked to true
+    call localStorage.setItem('cv-length', 'long')
+  end
+
+  if isLong is false
+    remove .cv-long from paper
+    add .cv-short to paper
+    set lengthCheckbox's checked to false
+    set menuLengthCheckbox's checked to false
+    call localStorage.setItem('cv-length', 'short')
+  end
+end
+
+def toggleIcons(showIcons)
+  set container to the first .cv-container
+  set iconsCheckbox to the first #icons-toggle
+  set menuIconsCheckbox to the first #menu-icons-toggle
+
+  -- Update DOM state
+  if showIcons is true
+    remove .hide-icons from container
+    set iconsCheckbox's checked to true
+    set menuIconsCheckbox's checked to true
+    call localStorage.setItem('cv-icons', 'show')
+  end
+
+  if showIcons is false
+    add .hide-icons to container
+    set iconsCheckbox's checked to false
+    set menuIconsCheckbox's checked to false
+    call localStorage.setItem('cv-icons', 'hide')
+  end
+end
+
+def toggleTheme(isClean)
+  set container to the first .cv-container
+  set themeCheckbox to the first #theme-toggle
+  set menuThemeCheckbox to the first #menu-theme-toggle
+
+  -- Update DOM state
+  if isClean is true
+    add .theme-clean to container
+    set themeCheckbox's checked to true
+    set menuThemeCheckbox's checked to true
+    call localStorage.setItem('cv-theme', 'clean')
+  end
+
+  if isClean is false
+    remove .theme-clean from container
+    set themeCheckbox's checked to false
+    set menuThemeCheckbox's checked to false
+    call localStorage.setItem('cv-theme', 'default')
+  end
+end
+
+-- ==============================================================================
+-- HOVER SYNC FUNCTIONS
+-- ==============================================================================
+
+def syncPdfHover(show)
+  set pdfButtons to .pdf-download-button
+
+  if show is true
+    for button in pdfButtons
+      add .pdf-hover-sync to button
+    end
+  end
+
+  if show is false
+    for button in pdfButtons
+      remove .pdf-hover-sync from button
+    end
+  end
+end
+
+def syncPrintHover(show)
+  set printButtons to .print-button
+
+  if show is true
+    for button in printButtons
+      add .print-hover-sync to button
+    end
+  end
+
+  if show is false
+    for button in printButtons
+      remove .print-hover-sync from button
+    end
+  end
+end
+
+def highlightZoomControl(show)
+  set zoomWrapper to the first #zoom-wrapper
+
+  if show is true
+    add .highlight to zoomWrapper
+  end
+
+  if show is false
+    remove .highlight from zoomWrapper
+  end
+end
+
 -- ==============================================================================
 -- KEYBOARD SHORTCUTS
 -- ==============================================================================