feat: add github_repo field to career applications and update intern dashboard UI

database/migrations/2026_06_05_220134_add_github_repo_to_career_applications_table.php

@@ -0,0 +1,28 @@
+<?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('career_applications', function (Blueprint $table) {
+            $table->string('github_repo')->nullable()->after('internship_total_days');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('career_applications', function (Blueprint $table) {
+            $table->dropColumn('github_repo');
+        });
+    }
+};