feat: implement Phase 7 (Course Player v2, Furigana, XP System, Integrated Vocab)

database/seeders/TestDataSeeder.php

@@ -114,7 +114,43 @@ class TestDataSeeder extends Seeder
             );
         }
 
-        // 5. Update User Stats
+        // 5. Vocabularies
+        $vocab1 = \App\Models\Vocabulary::updateOrCreate(
+            ['word' => '{私|わたし}'],
+            [
+                'reading' => 'わたし',
+                'romaji' => 'watashi',
+                'meaning_id' => 'Saya',
+                'meaning_en' => 'I / Me',
+                'type' => 'noun',
+                'level_id' => $n5->id,
+            ]
+        );
+
+        $vocab2 = \App\Models\Vocabulary::updateOrCreate(
+            ['word' => '{先生|せんせい}'],
+            [
+                'reading' => 'せんせい',
+                'romaji' => 'sensei',
+                'meaning_id' => 'Guru',
+                'meaning_en' => 'Teacher',
+                'type' => 'noun',
+                'level_id' => $n5->id,
+            ]
+        );
+
+        // Attach to lessons
+        $lesson1 = Lesson::where('slug', 'welcome-n5')->first();
+        if ($lesson1) {
+            $lesson1->vocabularies()->syncWithoutDetaching([$vocab1->id, $vocab2->id]);
+        }
+
+        $lesson2 = Lesson::where('slug', 'vowels-kana')->first();
+        if ($lesson2) {
+             $lesson2->vocabularies()->syncWithoutDetaching([$vocab1->id]);
+        }
+
+        // 6. Update User Stats
         $admin->update([
             'xp_points' => 1250,
             'current_streak' => 5,