Add attachment thumbnails and ACP refinements

database/migrations/2026_01_29_000100_add_attachment_thumbnails.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('attachments', function (Blueprint $table) {
+            $table->string('thumbnail_path')->nullable()->after('path');
+            $table->string('thumbnail_mime_type', 150)->nullable()->after('thumbnail_path');
+            $table->unsignedBigInteger('thumbnail_size_bytes')->nullable()->after('thumbnail_mime_type');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('attachments', function (Blueprint $table) {
+            $table->dropColumn(['thumbnail_path', 'thumbnail_mime_type', 'thumbnail_size_bytes']);
+        });
+    }
+};