Add HL3D branding, Etsy Live/Draft paging and Projects lifecycle

Replace the old touchmark/PNG identity with the supplied lockup and
monogram, segmented role-aware navigation, Live/Draft listing filters
with generation-based cache invalidation, and admin Projects covering
immutable file revisions, listing live pointers, and exact-decimal
filament/packaging/shipping costing. Additive schema only; no Etsy
publication. Isolated clone tests: 301 tests, 1162 assertions.

database/factories/ProjectCostLineFactory.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Database\Factories;
+
+use App\Models\ProjectCostLine;
+use App\Models\ProjectCostSnapshot;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<ProjectCostLine>
+ */
+class ProjectCostLineFactory extends Factory
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'cost_snapshot_id' => ProjectCostSnapshot::factory(),
+            'category' => ProjectCostLine::CATEGORY_FILAMENT,
+            'description' => 'PLA black',
+            'quantity' => '100.000',
+            'quantity_unit' => 'g',
+            'unit_rate' => '20.000000',
+            'waste_quantity' => '0.000',
+            'line_total' => '2.0000',
+        ];
+    }
+}