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)"

resources/views/errors/_layout.blade.php

@@ -0,0 +1,71 @@
+{{--
+    Error Layout — extends nova.blade.php
+    Shared structure for all error pages (404, 410, 403, 401, 500, contextual variants).
+
+    Enforces:
+    • noindex
+    • No canonical link
+    • Dark Nova design
+    • Full navigation visible
+    • Recovery CTAs
+
+    Variables:
+    $error_code     int     HTTP status code
+    $error_title    string  Short headline
+    $error_message  string  Friendly sentence
+--}}
+@extends('layouts.nova')
+
+@php
+    $code    = $error_code    ?? 404;
+    $title   = $error_title   ?? 'Page Not Found';
+    $message = $error_message ?? 'This page drifted into deep space.';
+@endphp
+
+@push('head')
+    {{-- SEO: never index error pages --}}
+    <meta name="robots" content="noindex, nofollow" />
+@endpush
+
+@section('content')
+<div class="min-h-[70vh] flex flex-col items-center justify-center px-4 py-16">
+
+    {{-- Hero block --}}
+    <div class="text-center max-w-xl mx-auto">
+
+        {{-- Code glow --}}
+        <div class="text-8xl font-extrabold text-sky-500/20 select-none leading-none mb-2">{{ $code }}</div>
+
+        {{-- Gradient badge --}}
+        <div class="inline-flex items-center gap-2 rounded-full bg-sky-500/10 border border-sky-500/20 px-4 py-1 text-xs font-semibold text-sky-400 uppercase tracking-widest mb-6">
+            @yield('badge', 'Error')
+        </div>
+
+        <h1 class="text-3xl sm:text-4xl font-extrabold text-white leading-tight mb-4">
+            {{ $title }}
+        </h1>
+
+        <p class="text-white/60 text-base sm:text-lg leading-relaxed mb-8">
+            {{ $message }}
+        </p>
+
+        {{-- Primary CTA --}}
+        @yield('primary-cta')
+
+        {{-- Secondary CTAs --}}
+        @hasSection('secondary-ctas')
+        <div class="flex flex-wrap justify-center gap-3 mt-4">
+            @yield('secondary-ctas')
+        </div>
+        @endif
+    </div>
+
+    {{-- Contextual recovery section --}}
+    @hasSection('recovery')
+    <div class="w-full max-w-5xl mx-auto mt-16">
+        @yield('recovery')
+    </div>
+    @endif
+
+</div>
+@endsection