fix: switch from CSS zoom to transform scale for true unlimited zoom

- Replace CSS zoom with transform: scale() for proper viewport extension
- Add dynamic margin-bottom to position footer correctly
- Remove zoom: 1 reset from fixed buttons (no longer needed)
- Enables true zoom from 10% to 500% that extends beyond viewport

static/css/main.css

@@ -2592,7 +2592,6 @@ html {
     z-index: 99;
     transition: all 0.3s ease;
     opacity: 0.2;
-    zoom: 1; /* Prevent zoom inheritance */
 }
 
 .back-to-top:hover {
@@ -2644,7 +2643,6 @@ html {
     z-index: 99;
     transition: all 0.3s ease;
     opacity: 0.2;
-    zoom: 1; /* Prevent zoom inheritance */
 }
 
 .info-button:hover {