Enhance Group and Document resources; add leader and helper teacher relationships, update navigation icons, and adjust navigation sorting.

database/migrations/2025_08_30_164831_create_teachers_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('teachers', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('photo')->nullable();
+            $table->text('bio')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('teachers');
+    }
+};

database/migrations/2025_08_30_164935_add_leader_teacher_id_to_groups_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('groups', function (Blueprint $table) {
+            $table->foreignId('leader_teacher_id')->nullable()->constrained('teachers')->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('groups', function (Blueprint $table) {
+            $table->dropForeign(['leader_teacher_id']);
+            $table->dropColumn('leader_teacher_id');
+        });
+    }
+};

database/migrations/2025_08_30_164952_create_group_teacher_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('group_teacher', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('group_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('teacher_id')->constrained()->cascadeOnDelete();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('group_teacher');
+    }
+};