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

app/Models/Group.php

@@ -3,11 +3,12 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 
 /**
- * @property string $name
  * @property date $start_date
  * @property date $end_date
  * @property Pilgrim[] $pilgrims
@@ -22,4 +23,14 @@ class Group extends Model
     {
         return $this->hasMany(Pilgrim::class);
     }
+
+    public function leaderTeacher(): BelongsTo
+    {
+        return $this->belongsTo(Teacher::class, 'leader_teacher_id');
+    }
+
+    public function helperTeachers(): BelongsToMany
+    {
+        return $this->belongsToMany(Teacher::class, 'group_teacher');
+    }
 }

app/Models/Teacher.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Teacher extends Model
+{
+    /** @use HasFactory<\Database\Factories\TeacherFactory> */
+    use HasFactory;
+
+    public function ledGroups(): HasMany
+    {
+        return $this->hasMany(Group::class, 'leader_teacher_id');
+    }
+
+    public function assistedGroups(): BelongsToMany
+    {
+        return $this->belongsToMany(Group::class, 'group_teacher');
+    }
+}