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/messages/en.json

@@ -63,7 +63,10 @@
     "usernamePlaceholder": "Username",
     "password": "Password",
     "passwordPlaceholder": "Password",
-    "invalidCredentials": "Incorrect username or password."
+    "invalidCredentials": "Incorrect username or password.",
+    "kojaSlug": "Koja profile address",
+    "kojaSlugHint": "Customers will find your cafe at this address",
+    "kojaSlugPlaceholder": "e.g. my-cafe"
   },
   "roles": {
     "owner": "Owner",
@@ -1228,7 +1231,13 @@
       "uploadLogo": "Upload logo",
       "uploadCover": "Upload cover",
       "saved": "Profile saved.",
-      "reloginHint": "Plan updated; sign out and in again if the badge looks wrong."
+      "reloginHint": "Plan updated; sign out and in again if the badge looks wrong.",
+      "slug": "Koja profile address",
+      "slugHint": "Your cafe page on Koja — lowercase letters, digits, hyphens only",
+      "slugPlaceholder": "my-cafe",
+      "slugTaken": "This address is already taken. Please choose another.",
+      "slugInvalid": "Invalid address. Use lowercase letters, digits, and hyphens only.",
+      "kojaUrl": "Koja URL"
     },
     "taraz": "Taraz (tax system)",
     "tarazHint": "Submit yesterday's invoices to Taraz (demo mode logs only).",
@@ -1655,4 +1664,4 @@
       "premium": "Premium"
     }
   }
-}
+}