feat: enhance zoom and print button UX

Print Button Improvements:
- Hover shows white background with green icon (was green bg + white icon)
- Applied to all print buttons: fixed, action bar, and menu
- Default state remains dark gray with white icon

Zoom Control Improvements:
- Text now 100% white (was 70-95% opacity) for better readability
- Increased font sizes: labels 0.95rem (was 0.8rem), current value 1.05rem (was 0.9rem)
- Hover zoom toggle button highlights zoom control with blue glow shadow
- Active zoom button uses semi-transparent blue rgba(52, 152, 219, 0.5) instead of solid

Z-Index Fix:
- Hamburger menu now appears above fixed buttons (z-index: 1000 vs 999)

templates/partials/widgets/zoom-toggle-button.html

@@ -4,7 +4,11 @@
     id="zoom-toggle-button"
     class="fixed-btn zoom-toggle-btn no-print"
     aria-label="{{if eq .Lang "es"}}Alternar control de zoom{{else}}Toggle zoom control{{end}}"
-    title="{{if eq .Lang "es"}}Control de zoom{{else}}Zoom control{{end}}">
+    title="{{if eq .Lang "es"}}Control de zoom{{else}}Zoom control{{end}}"
+    _="on mouseenter
+         add .zoom-highlight to #zoom-control
+       on mouseleave
+         remove .zoom-highlight from #zoom-control">
     <iconify-icon icon="mdi:magnify" width="28" height="28"></iconify-icon>
 </button>
 {{end}}