fix: sidebar accordion + koja slug + support ticket LINQ crash

Sidebar:
- All groups start collapsed on first load (v4 storage key resets old state)
- Opening one group closes all others (accordion)
- Navigating to a section opens only that section's group

Koja slug:
- SlugHelper: Persian->Latin transliteration, slug validation
- Registration accepts optional custom slug; auto-derives from cafe name
- Slug can be updated from dashboard Settings -> Profile
- Settings PATCH validates uniqueness (SLUG_TAKEN) and format (INVALID_SLUG)
- koja.meezi.ir/{slug} now redirects to /fa/cafe/{slug} (short URL support)

Bug fix:
- SupportTicketService: cafeId/status filters applied before Select() projection
  to fix EF "could not be translated" crash on the support tickets page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/dashboard/src/components/layout/sidebar.tsx

@@ -45,7 +45,8 @@ function buildDefaultOpenGroups(): OpenGroupsState {
   const stored = readStoredOpenGroups();
   const defaults: OpenGroupsState = {};
   for (const g of NAV_GROUPS) {
-    defaults[g.id] = stored[g.id] ?? g.defaultOpen;
+    // Default ALL groups closed on first visit; only restore if user explicitly saved state.
+    defaults[g.id] = stored[g.id] ?? false;
   }
   return defaults;
 }
@@ -238,20 +239,31 @@ export function Sidebar({ side }: { side: "left" | "right" }) {
     [role, branchId, permissions]
   );
 
+  /** Accordion: opening a group collapses all others. */
   const setGroupOpen = useCallback((groupId: NavGroupId, open: boolean) => {
-    setOpenGroups((prev) => {
-      const next = { ...prev, [groupId]: open };
+    setOpenGroups((_prev) => {
+      const next: OpenGroupsState = {};
+      for (const g of NAV_GROUPS) {
+        // If opening: only the clicked group becomes true; everything else closes.
+        // If closing: just close the clicked group, leave others as-is.
+        next[g.id] = open ? g.id === groupId : g.id === groupId ? false : (_prev[g.id] ?? false);
+      }
       persistOpenGroups(next);
       return next;
     });
   }, []);
 
+  // When navigating to a new path, open only the group that contains that path (accordion).
   useEffect(() => {
     const activeGroup = findNavGroupForPath(pathname);
     if (!activeGroup) return;
     setOpenGroups((prev) => {
-      if (prev[activeGroup]) return prev;
-      const next = { ...prev, [activeGroup]: true };
+      if (prev[activeGroup]) return prev; // already open, nothing to do
+      // Accordion: open active group, close all others
+      const next: OpenGroupsState = {};
+      for (const g of NAV_GROUPS) {
+        next[g.id] = g.id === activeGroup;
+      }
       persistOpenGroups(next);
       return next;
     });