feat: add UserResource with is_admin toggle and delete

User management resource with editable is_admin field, postcode support,
admin filter, and inline delete action. Includes list and edit pages.

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

app/Filament/Resources/StationResource.php

@@ -2,6 +2,7 @@
 
 namespace App\Filament\Resources;
 
+use App\Filament\NavigationGroup;
 use App\Filament\Resources\StationResource\Pages\ListStations;
 use App\Filament\Resources\StationResource\Pages\ViewStation;
 use App\Models\Station;
@@ -20,9 +21,7 @@ class StationResource extends Resource
 {
     protected static ?string $model = Station::class;
 
-    protected static string|\BackedEnum|null $navigationIcon = 'heroicon-o-map-pin';
-
-    protected static string|\UnitEnum|null $navigationGroup = 'Data';
+    protected static string|\UnitEnum|null $navigationGroup = NavigationGroup::Data;
 
     protected static ?string $navigationLabel = 'Stations';
 
@@ -32,10 +31,13 @@ class StationResource extends Resource
     {
         return $table
             ->columns([
-                TextColumn::make('trading_name')->searchable()->sortable(),
+                TextColumn::make('trading_name')->searchable()->sortable()
+                    ->limit(25)
+                    ->tooltip(fn (Station $record) => strlen($record->trading_name) > 45 ? $record->trading_name : null),
                 TextColumn::make('brand_name')->searchable()->placeholder('—'),
-                TextColumn::make('postcode')->searchable(),
-                TextColumn::make('city'),
+                TextColumn::make('city')
+                    ->description(fn (Station $record) => $record->postcode)
+                    ->searchable(['city', 'postcode']),
                 IconColumn::make('is_supermarket')->label('Supermarket')->boolean(),
                 IconColumn::make('is_motorway_service_station')->label('Motorway')->boolean(),
                 IconColumn::make('temporary_closure')