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>

src/Meezi.API/Controllers/CafeSettingsController.cs

@@ -4,6 +4,7 @@ using Microsoft.EntityFrameworkCore;
 using Meezi.API.Models.Cafes;
 using Meezi.API.Services;
 using Meezi.Core.Interfaces;
+using Meezi.Core.Utilities;
 using Meezi.Infrastructure.Branding;
 using Meezi.Infrastructure.Data;
 using Meezi.Shared;
@@ -57,6 +58,21 @@ public class CafeSettingsController : CafeApiControllerBase
         if (cafe is null) return NotFoundError();
 
         if (request.Name is not null) cafe.Name = request.Name.Trim();
+
+        if (request.Slug is not null)
+        {
+            var newSlug = request.Slug.Trim().ToLowerInvariant();
+            if (!SlugHelper.IsValidSlug(newSlug))
+                return BadRequest(new ApiResponse<object>(false, null,
+                    new ApiError("INVALID_SLUG", "Slug must be 2-80 lowercase letters, digits, or hyphens.")));
+
+            var taken = await _db.Cafes.AnyAsync(c => c.Slug == newSlug && c.Id != cafeId, ct);
+            if (taken)
+                return Conflict(new ApiResponse<object>(false, null,
+                    new ApiError("SLUG_TAKEN", "This Koja profile address is already in use. Please choose another.")));
+
+            cafe.Slug = newSlug;
+        }
         if (request.Phone is not null) cafe.Phone = request.Phone.Trim();
         if (request.Address is not null) cafe.Address = request.Address.Trim();
         if (request.City is not null) cafe.City = request.City.Trim();