fix(electrobun): sidebar AGOR non-selectable, larger font, settings clickable

- AGOR title: pointer-events:none (clicks pass to drag zone), user-select:none,
  font-size 1.25rem→1.5rem (20% larger), removed cursor:grab
- Settings button: z-index:1 (above drag zone), clickable again
- Group buttons: z-index:1 (above drag zone)
- Drag zone stays z-index:0 as catch-all behind interactive elements

ui-electrobun/src/mainview/App.svelte

@@ -666,13 +666,13 @@
     transform: rotate(180deg);
     font-family: "Inter", system-ui, sans-serif;
     font-weight: 900;
-    font-size: 1.25rem;
+    font-size: 1.5rem;
     letter-spacing: 0.2em;
     color: var(--ctp-overlay0);
     padding: 1rem 0;
     user-select: none;
+    pointer-events: none;
     flex-shrink: 0;
-    cursor: grab;
   }
 
   .sidebar-groups {
@@ -684,6 +684,8 @@
     padding: 0.25rem 0;
     border-bottom: 1px solid var(--ctp-surface0);
     margin-bottom: 0.125rem;
+    position: relative;
+    z-index: 1; /* Above the drag zone */
   }
 
   .sidebar-spacer {

ui-electrobun/src/mainview/app.css

@@ -106,6 +106,8 @@ html, body {
   justify-content: center;
   transition: background 0.15s, color 0.15s;
   padding: 0;
+  position: relative;
+  z-index: 1; /* Above the drag zone */
 }
 
 .sidebar-icon:hover {