fix: disable sorting on computed status column

Status is a computed attribute (accessor) and not a database column.
Sorting on it causes a SQL error. This fix disables sorting for the
status column.

Fixes #61

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Baspa

src/Resources/MailResource.php

@@ -336,7 +336,7 @@ public static function table(Table $table): Table
             ->columns([
                 TextColumn::make('status')
                     ->label(__('Status'))
-                    ->sortable()
+                    ->sortable(false)
                     ->searchable(false)
                     ->badge()
                     ->color(fn (string $state): string => match ($state) {