feat: compact relay status indicator on mobile

- Show only icon on mobile (44x44px touch target)
- Tap to expand for full details
- Smooth transition between compact and expanded states
- Maintains full display on desktop
- Reduces screen clutter on mobile while keeping info accessible

Flight mode notice now just shows airplane icon on mobile.
Tap it to see full connection details.

src/index.css

@@ -2909,6 +2909,34 @@ body.mobile-sidebar-open {
   cursor: default;
 }
 
+/* Mobile compact mode - just show icon */
+@media (max-width: 768px) {
+  .relay-status-indicator.mobile {
+    padding: 0.5rem;
+    width: var(--min-touch-target);
+    height: var(--min-touch-target);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    bottom: 1rem;
+    left: 1rem;
+  }
+
+  .relay-status-indicator.mobile.expanded {
+    width: auto;
+    padding: 0.75rem 1rem;
+    gap: 0.75rem;
+  }
+
+  .relay-status-indicator.mobile .relay-status-icon {
+    font-size: 1.1rem;
+  }
+
+  .relay-status-indicator.mobile:active {
+    transform: scale(0.95);
+  }
+}
+
 .relay-status-indicator.connecting {
   background: rgba(100, 108, 255, 0.15);
   border: 1px solid rgba(100, 108, 255, 0.25);