refactor: organize hyperscript code and implement mobile button layout

This commit includes two major improvements:

1. Hyperscript Code Organization:
   - Extracted all hyperscript blocks >3 lines into reusable functions
   - Created 6 new functions in functions._hs:
     * toggleCVLength(isLong) - CV length toggle sync
     * toggleIcons(showIcons) - Icons toggle sync
     * toggleTheme(isClean) - Theme toggle sync
     * syncPdfHover(show) - PDF button synchronized hover
     * syncPrintHover(show) - Print button synchronized hover
     * highlightZoomControl(show) - Zoom control highlight effect
   - Reduced inline hyperscript from 11+ lines to 1-2 lines per element
   - Updated 8 template files to use function calls:
     * hamburger-menu.html
     * view-controls.html
     * action-buttons.html
     * download-button.html
     * print-friendly-button.html
     * zoom-toggle-button.html

2. Mobile Button Layout (max-width: 900px):
   - Repositioned three fixed buttons (PDF, Print, Info) horizontally at bottom center
   - Print button perfectly centered in viewport
   - Download button on left, Info button on right
   - Hidden zoom and shortcuts buttons on mobile (available in hamburger menu)
   - Removed conflicting old mobile styles that were hiding print button
   - Smooth hover transitions maintained with proper transform calculations

Technical details:
- Used CSS transform with calc() for precise horizontal positioning
- Maintained hover effects with combined translateX/translateY transforms
- Ensured accessibility with proper ARIA labels and spacing
- All functions check element existence before manipulation
- LocalStorage sync maintained across desktop/mobile toggles

templates/partials/widgets/download-button.html

@@ -6,12 +6,8 @@
     aria-label="{{if eq .Lang "es"}}Descargar PDF{{else}}Download PDF{{end}}"
     title="{{if eq .Lang "es"}}Descargar PDF{{else}}Download PDF{{end}}"
     onclick="document.getElementById('pdf-modal').showModal()"
-    _="on mouseenter
-         add .pdf-hover-sync to me
-         add .pdf-hover-sync to #action-bar-pdf-btn
-       on mouseleave
-         remove .pdf-hover-sync from me
-         remove .pdf-hover-sync from #action-bar-pdf-btn">
+    _="on mouseenter call syncPdfHover(true)
+       on mouseleave call syncPdfHover(false)">
     <iconify-icon icon="catppuccin:pdf" width="28" height="28"></iconify-icon>
 </button>
 {{end}}