feat: Nova UI component library + Studio dropdown/picker polish

- Add Nova UI library: Button, TextInput, Textarea, FormField, Select,
  NovaSelect, Checkbox, Radio/RadioGroup, Toggle, DatePicker,
  DateRangePicker, Modal + barrel index.js
- Replace all native <select> in Studio with NovaSelect (StudioFilters,
  StudioToolbar, BulkActionsBar) including frosted-glass portal and
  category group headers
- Replace native checkboxes in StudioGridCard, StudioTable, UploadSidebar,
  UploadWizard, Upload/Index with custom Checkbox component
- Add nova-scrollbar CSS utility (thin 4px, semi-transparent)
- Fix portal position drift: use viewport-relative coords (no scrollY offset)
  for NovaSelect, DatePicker and DateRangePicker
- Close portals on external scroll instead of remeasuring
- Improve hover highlight visibility in NovaSelect (bg-white/[0.13])
- Move search icon to right side in NovaSelect dropdown
- Reduce Studio layout top spacing (py-6 -> pt-4 pb-8)
- Add StudioCheckbox and SquareCheckbox backward-compat shims
- Add sync.sh rsync deploy script

resources/js/Layouts/StudioLayout.jsx

@@ -68,9 +68,9 @@ export default function StudioLayout({ children, title }) {
         </aside>
 
         {/* Main content */}
-        <main className="flex-1 min-w-0 px-4 lg:px-8 py-6">
+        <main className="flex-1 min-w-0 px-4 lg:px-8 pt-4 pb-8">
           {title && (
-            <h1 className="text-2xl font-bold text-white mb-6">{title}</h1>
+            <h1 className="text-2xl font-bold text-white mb-4">{title}</h1>
           )}
           {children}
         </main>