fix(i18n): include namespace in cache key/query, clean up singleton, test isolation

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

app/Domains/Translation/Providers/DatabaseTranslationLoader.php

@@ -10,7 +10,8 @@ class DatabaseTranslationLoader implements Loader
 {
     public function load($locale, $group, $namespace = null): array
     {
-        $cacheKey = "lang:{$locale}:{$group}";
+        $ns = $namespace ?? '*';
+        $cacheKey = "lang:{$ns}:{$locale}:{$group}";
 
         $cached = Redis::hGetAll($cacheKey);
         if (! empty($cached)) {
@@ -19,6 +20,7 @@ class DatabaseTranslationLoader implements Loader
 
         $translations = Translation::where('locale', $locale)
             ->where('group', $group)
+            ->where('namespace', $namespace ?? '*')
             ->pluck('value', 'key')
             ->toArray();
 
@@ -31,7 +33,6 @@ class DatabaseTranslationLoader implements Loader
     }
 
     public function addNamespace($namespace, $hint): void {}
-    public function addPath($path): void {}
     public function addJsonPath($path): void {}
 
     public function namespaces(): array

app/Providers/AppServiceProvider.php

@@ -15,18 +15,17 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register(): void
     {
-        $this->app->singleton('translation.loader', function ($app) {
-            return new DatabaseTranslationLoader;
-        });
+        $this->app->singleton('translation.loader', fn() => new DatabaseTranslationLoader);
 
         // TranslationServiceProvider is deferred and re-binds translation.loader
         // when it resolves. We extend 'translator' to swap in our DB loader after
         // the translator instance is created.
         $this->app->extend('translator', function ($translator, $app) {
             $loader = new DatabaseTranslationLoader;
-            $reflection = new \ReflectionProperty($translator, 'loader');
-            $reflection->setAccessible(true);
-            $reflection->setValue($translator, $loader);
+            // Keep the singleton up-to-date so app('translation.loader') returns ours.
+            $app->instance('translation.loader', $loader);
+            $prop = new \ReflectionProperty($translator, 'loader');
+            $prop->setValue($translator, $loader);
 
             return $translator;
         });

tests/Feature/Translation/TranslationServiceTest.php

@@ -5,10 +5,14 @@ use Illuminate\Support\Facades\App;
 use Illuminate\Support\Facades\Redis;
 
 beforeEach(function () {
+    Redis::del('lang:*:de:auth');
     Redis::del('lang:de:auth');
+    app('translator')->setLoaded([]);
 });
 
 afterEach(function () {
+    app('translator')->setLoaded([]);
+    Redis::del('lang:*:de:auth');
     Redis::del('lang:de:auth');
 });