feat(ui): add collapsible sidebar with tooltip and team menu

Sidebar collapses to icon-only mode on lg breakpoint. State persists
in localStorage. Collapsed state shows logo icon, team initial button
with flyout menu, and hover tooltips for nav items.

resources/css/utilities.css

@@ -343,3 +343,12 @@
 @utility log-info {
     @apply bg-blue-500/10 dark:bg-blue-500/15;
 }
+
+@media (min-width: 1024px) {
+    .sidebar-collapsed .menu-item {
+        justify-content: center;
+        padding-left: 0;
+        padding-right: 0;
+        gap: 0;
+    }
+}