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.Core/Utilities/SlugHelper.cs

@@ -0,0 +1,87 @@
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Meezi.Core.Utilities;
+
+/// <summary>
+/// Converts Persian/Arabic café names to URL-safe Latin slugs.
+/// Used for Koja profile URLs (koja.meezi.ir/fa/cafe/{slug}).
+/// </summary>
+public static partial class SlugHelper
+{
+    private static readonly Dictionary<char, string> PersianToLatin = new()
+    {
+        // Alef variants
+        { 'آ', "a" }, { 'ا', "a" }, { 'أ', "a" }, { 'إ', "a" },
+        // Ba, Pa, Ta, Tha
+        { 'ب', "b" }, { 'پ', "p" }, { 'ت', "t" }, { 'ث', "s" },
+        // Jim, Che, He, Khe
+        { 'ج', "j" }, { 'چ', "ch" }, { 'ح', "h" }, { 'خ', "kh" },
+        // Dal, Zal, Re, Ze, Zhe
+        { 'د', "d" }, { 'ذ', "z" }, { 'ر', "r" }, { 'ز', "z" }, { 'ژ', "zh" },
+        // Sin, Shin, Sad, Zad
+        { 'س', "s" }, { 'ش', "sh" }, { 'ص', "s" }, { 'ض', "z" },
+        // Ta, Za, Ain, Ghain
+        { 'ط', "t" }, { 'ظ', "z" }, { 'ع', "a" }, { 'غ', "gh" },
+        // Fa, Ghaf, Kaf (Arabic+Persian), Gaf
+        { 'ف', "f" }, { 'ق', "gh" }, { 'ک', "k" }, { 'ك', "k" }, { 'گ', "g" },
+        // Lam, Mim, Nun, Vav, He, Ye
+        { 'ل', "l" }, { 'م', "m" }, { 'ن', "n" }, { 'و', "v" },
+        { 'ه', "h" }, { 'ی', "i" }, { 'ي', "i" },
+        // Special
+        { 'ئ', "y" }, { 'ء', "" }, { 'ة', "t" }, { 'ى', "a" }, { 'ؤ', "o" },
+        // Persian digits
+        { '۰', "0" }, { '۱', "1" }, { '۲', "2" }, { '۳', "3" }, { '۴', "4" },
+        { '۵', "5" }, { '۶', "6" }, { '۷', "7" }, { '۸', "8" }, { '۹', "9" },
+        // Arabic-Indic digits
+        { '٠', "0" }, { '١', "1" }, { '٢', "2" }, { '٣', "3" }, { '٤', "4" },
+        { '٥', "5" }, { '٦', "6" }, { '٧', "7" }, { '٨', "8" }, { '٩', "9" },
+    };
+
+    /// <summary>
+    /// Converts a café name (Persian or Latin) to a URL-safe lowercase slug.
+    /// Returns an empty string if no valid characters can be extracted.
+    /// </summary>
+    public static string Slugify(string input)
+    {
+        if (string.IsNullOrWhiteSpace(input)) return string.Empty;
+
+        var sb = new StringBuilder(input.Length * 2);
+        foreach (var ch in input)
+        {
+            if (PersianToLatin.TryGetValue(ch, out var latin))
+            {
+                sb.Append(latin);
+            }
+            else if (char.IsAsciiLetterOrDigit(ch))
+            {
+                sb.Append(char.ToLowerInvariant(ch));
+            }
+            else if (ch is ' ' or '-' or '_' or '\t')
+            {
+                sb.Append('-');
+            }
+            // else: skip punctuation/unsupported characters
+        }
+
+        // Collapse consecutive hyphens and trim
+        return MultipleHyphen().Replace(sb.ToString(), "-").Trim('-');
+    }
+
+    /// <summary>
+    /// Returns true if the slug is a valid Koja URL slug:
+    /// 2–80 lowercase letters, digits, or internal hyphens. Must start and end with a letter/digit.
+    /// </summary>
+    public static bool IsValidSlug(string? slug)
+    {
+        if (string.IsNullOrWhiteSpace(slug)) return false;
+        if (slug.Length < 2 || slug.Length > 80) return false;
+        return ValidSlugPattern().IsMatch(slug);
+    }
+
+    [GeneratedRegex(@"-{2,}")]
+    private static partial Regex MultipleHyphen();
+
+    [GeneratedRegex(@"^[a-z0-9][a-z0-9\-]*[a-z0-9]$")]
+    private static partial Regex ValidSlugPattern();
+}