fix: Add overflow:visible to action bar to prevent tooltip clipping

The action-bar containers had implicit overflow clipping which prevented
custom CSS tooltips from appearing outside the 50px height limit.

Added overflow:visible to:
- .action-bar (main container)
- .action-bar-content (content wrapper)
- .action-buttons-right (button container)

This allows tooltips to properly extend beyond the action bar boundaries.

static/css/03-components/_action-bar.css

@@ -7,6 +7,7 @@
     z-index: 100;
     box-shadow: var(--shadow-md);
     font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
+    overflow: visible; /* Allow tooltips to extend beyond action bar */
 }
 
 .action-bar-content {
@@ -18,6 +19,7 @@
     align-items: stretch;
     gap: 2rem;
     height: 50px;
+    overflow: visible; /* Allow tooltips to extend beyond content area */
 }
 
 /* Left: Site Title */
@@ -474,6 +476,7 @@ iconify-icon {
     gap: 0;
     align-items: stretch;
     height: 100%;
+    overflow: visible; /* Allow tooltips to extend beyond button container */
 }
 
 .action-buttons-right {