Flag saluran bermasalah + pautan Call/WhatsApp

- Halaman baharu "Saluran Bermasalah": senarai semua saluran dalam DUN
  (dengan KTM & telefonnya), tanda/buang tanda bermasalah berserta
  catatan; admin DUN terhad ke DUN sendiri, superadmin semua DUN
- Dashboard: baris saluran bermasalah diserlahkan kuning berserta
  lencana BERMASALAH dan catatan
- No. telefon KTM kini ada butang "📞 Call" (tel:) dan "WhatsApp"
  (wa.me, dinormalkan ke format 60xxxxxxxxx) di dashboard dan halaman
  saluran bermasalah

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/Models/SaluranBermasalah.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Sppm\PusatMengundi;
+use App\Models\Sppm\Saluran;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SaluranBermasalah extends Model
+{
+    protected $table = 'saluran_bermasalah';
+
+    protected $fillable = [
+        'saluran_id',
+        'pusat_mengundi_id',
+        'dun_id',
+        'catatan',
+        'dilapor_oleh_user_id',
+    ];
+
+    public function saluran(): BelongsTo
+    {
+        return $this->belongsTo(Saluran::class, 'saluran_id');
+    }
+
+    public function pusatMengundi(): BelongsTo
+    {
+        return $this->belongsTo(PusatMengundi::class, 'pusat_mengundi_id');
+    }
+
+    public function dilaporOleh(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'dilapor_oleh_user_id');
+    }
+}

app/Models/Sppm/PetugasPermohonan.php

@@ -30,6 +30,36 @@ class PetugasPermohonan extends Model
         return $this->belongsTo(Dun::class, 'dun_id');
     }
 
+    /**
+     * No. telefon dalam digit sahaja (untuk pautan tel:).
+     */
+    public function telefonDigits(): ?string
+    {
+        $digit = preg_replace('/\D/', '', (string) $this->no_telefon);
+
+        return $digit !== '' ? $digit : null;
+    }
+
+    /**
+     * Pautan WhatsApp (wa.me) — normalkan ke format antarabangsa Malaysia.
+     */
+    public function whatsappUrl(): ?string
+    {
+        $digit = $this->telefonDigits();
+
+        if ($digit === null) {
+            return null;
+        }
+
+        if (str_starts_with($digit, '0')) {
+            $digit = '6'.$digit;
+        } elseif (! str_starts_with($digit, '60')) {
+            $digit = '60'.$digit;
+        }
+
+        return 'https://wa.me/'.$digit;
+    }
+
     public function assignments(): HasMany
     {
         return $this->hasMany(PetugasAssignment::class, 'permohonan_id');

app/Models/Sppm/Saluran.php

@@ -3,10 +3,22 @@
 namespace App\Models\Sppm;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Saluran extends Model
 {
     protected $connection = 'sppm';
     protected $table = 'saluran';
     protected $guarded = [];
+
+    public function pusatMengundi(): BelongsTo
+    {
+        return $this->belongsTo(PusatMengundi::class, 'pusat_mengundi_id');
+    }
+
+    public function assignments(): HasMany
+    {
+        return $this->hasMany(PetugasAssignment::class, 'saluran_id');
+    }
 }