Refactor Filament resources and models; add attribute casting in Group model, update navigation icons, and remove TeacherSeeder in favor of UserTableSeeder.

database/seeders/TeacherTableSeeder.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Console\Seeds\WithoutModelEvents;
+use Illuminate\Database\Seeder;
+use App\Models\Teacher;
+
+class TeacherTableSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     */
+    public function run(): void
+    {
+        $teachers = collect([
+            [
+                'name' => 'Nurmuhammet',
+                'photo' => 'teachers/nurmuhammet.png',
+                'bio' => 'Nurmuhammet esasy topar ýolbaşçy.',
+            ],
+            [
+                'name' => 'Juma',
+                'photo' => 'teachers/jumash.png',
+                'bio' => 'Juma, Abdyrahman tagsyryň okuwçysy, topar ýolbaşçy.',
+            ],
+            [
+                'name' => 'Resul',
+                'photo' => 'teachers/resul.png',
+                'bio' => 'Resul topar ýolbaşçy.',
+            ],
+        ]);
+
+        $teachers->each(fn ($teacher) => Teacher::create($teacher));
+    }
+}