feat: Inertia profile settings page, Studio edit redesign, EGS, Nova UI components\n\n- Redesign /dashboard/profile as Inertia React page (Settings/ProfileEdit)\n with SettingsLayout sidebar, Nova UI components (TextInput, Textarea,\n Toggle, Select, RadioGroup, Modal, Button), avatar drag-and-drop,\n password change, and account deletion sections\n- Redesign Studio artwork edit page with two-column layout, Nova components,\n integrated TagPicker, and version history modal\n- Add shared MarkdownEditor component\n- Add Early-Stage Growth System (EGS): SpotlightEngine, FeedBlender,\n GridFiller, AdaptiveTimeWindow, ActivityLayer, admin panel\n- Fix upload category/tag persistence (V1+V2 paths)\n- Fix tag source enum, category tree display, binding resolution\n- Add settings.jsx Vite entry, settings.blade.php wrapper\n- Update ProfileController with JSON response support for API calls\n- Various route fixes (profile.edit, toolbar settings link)"

app/Services/EarlyGrowth/SpotlightEngineInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\EarlyGrowth;
+
+use Illuminate\Support\Collection;
+
+/**
+ * Contract for spotlight / curated content selection.
+ * Allows test doubles and alternative implementations.
+ */
+interface SpotlightEngineInterface
+{
+    public function getSpotlight(int $limit = 6): Collection;
+
+    public function getCurated(int $limit = 12, int $olderThanDays = 7): Collection;
+}