Add project listing selector, confirmed revision and private 3MF renders

database/factories/ProjectFileRenderFactory.php

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+<?php
+
+namespace Database\Factories;
+
+use App\Models\ProjectFile;
+use App\Models\ProjectFileRender;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<ProjectFileRender>
+ */
+class ProjectFileRenderFactory extends Factory
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'project_file_id' => ProjectFile::factory(),
+            'renderer' => ProjectFileRender::RENDERER_SVG,
+            'mime_type' => 'image/svg+xml',
+            'storage_key' => fake()->unique()->uuid().'.svg',
+            'width' => 512,
+            'height' => 512,
+            'triangle_count' => 2,
+            'instance_count' => 1,
+            'alt_text' => 'Numeric 3D render preview.',
+            'byte_size' => 256,
+            'sha256' => hash('sha256', fake()->unique()->uuid()),
+            'generated_by' => User::factory()->create(['role' => 'admin'])->id,
+            'generated_at' => now(),
+        ];
+    }
+}

database/migrations/2026_11_08_001000_add_current_revision_to_projects_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
+{
+    public function up(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->foreignId('current_revision_id')->nullable()->after('stage')
+                ->constrained('project_revisions')->nullOnDelete();
+            $table->unsignedInteger('lock_version')->default(0)->after('archived_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('projects', function (Blueprint $table): void {
+            $table->dropConstrainedForeignId('current_revision_id');
+            $table->dropColumn('lock_version');
+        });
+    }
+};

database/migrations/2026_11_08_001100_create_project_file_renders_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
+{
+    public function up(): void
+    {
+        Schema::create('project_file_renders', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('project_file_id')->unique()->constrained('project_files')->cascadeOnDelete();
+            $table->string('renderer');
+            $table->string('mime_type');
+            $table->string('storage_key')->unique();
+            $table->unsignedInteger('width');
+            $table->unsignedInteger('height');
+            $table->unsignedInteger('triangle_count');
+            $table->unsignedInteger('instance_count');
+            $table->text('alt_text');
+            $table->unsignedBigInteger('byte_size');
+            $table->string('sha256', 64);
+            // Legacy users.id is signed INT, not bigint.
+            $table->integer('generated_by');
+            $table->foreign('generated_by')->references('id')->on('users')->restrictOnDelete();
+            $table->timestamp('generated_at');
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('project_file_renders');
+    }
+};