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/components/ui/Select.jsx

@@ -0,0 +1,87 @@
+import React, { forwardRef } from 'react'
+
+/**
+ * Nova Select – styled native <select>
+ *
+ * Accepts the same options API as a plain <select>:
+ *   - Pass children (<option>, <optgroup>) directly, OR
+ *   - Pass `options` array of { value, label } and optional `placeholder`
+ *
+ * @prop {Array}   options     - [{ value, label }] – optional shorthand
+ * @prop {string}  placeholder - adds a blank first option when using `options`
+ * @prop {string}  label       - field label
+ * @prop {string}  error       - validation error
+ * @prop {string}  hint        - helper text
+ * @prop {boolean} required    - asterisk on label
+ * @prop {string}  size        - 'sm' | 'md' | 'lg'
+ */
+const Select = forwardRef(function Select(
+  { label, error, hint, required, options, placeholder, size = 'md', id, className = '', children, ...rest },
+  ref,
+) {
+  const inputId = id ?? (label ? label.toLowerCase().replace(/\s+/g, '-') : undefined)
+
+  const sizeClass = {
+    sm: 'py-1.5 text-xs',
+    md: 'py-2.5 text-sm',
+    lg: 'py-3   text-base',
+  }[size] ?? 'py-2.5 text-sm'
+
+  const inputClass = [
+    'block w-full rounded-xl border bg-white/[0.06] text-white',
+    'pl-3.5 pr-9',
+    'appearance-none cursor-pointer',
+    'bg-no-repeat bg-right',
+    'transition-all duration-150',
+    'focus:outline-none focus:ring-2 focus:ring-offset-0',
+    error
+      ? 'border-red-500/60 focus:border-red-500/70 focus:ring-red-500/40'
+      : 'border-white/12 hover:border-white/20 focus:border-accent/50 focus:ring-accent/40',
+    'disabled:opacity-50 disabled:cursor-not-allowed',
+    sizeClass,
+    className,
+  ].join(' ')
+
+  return (
+    <div className="flex flex-col gap-1.5">
+      {label && (
+        <label htmlFor={inputId} className="text-sm font-medium text-white/85">
+          {label}
+          {required && <span className="text-red-400 ml-1">*</span>}
+        </label>
+      )}
+
+      <div className="relative">
+        <select
+          id={inputId}
+          ref={ref}
+          className={inputClass}
+          aria-invalid={!!error}
+          {...rest}
+        >
+          {placeholder && <option value="" className="bg-nova-900">{placeholder}</option>}
+
+          {options
+            ? options.map((o) => (
+                <option key={o.value} value={o.value} className="bg-nova-900 text-white">
+                  {o.label}
+                </option>
+              ))
+            : children}
+        </select>
+
+        {/* Custom chevron */}
+        <span className="pointer-events-none absolute right-3 top-1/2 -translate-y-1/2 text-slate-500">
+          <svg width="12" height="12" viewBox="0 0 12 12" fill="none" aria-hidden="true">
+            <path d="M2 4l4 4 4-4" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" />
+          </svg>
+        </span>
+      </div>
+
+      {error && <p role="alert" className="text-xs text-red-400">{error}</p>}
+      {!error && hint && <p className="text-xs text-slate-500">{hint}</p>}
+    </div>
+  )
+})
+
+export default Select