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/Textarea.jsx

@@ -0,0 +1,65 @@
+import React, { forwardRef } from 'react'
+
+/**
+ * Nova Textarea
+ *
+ * @prop {string}  label    - optional label
+ * @prop {string}  error    - validation error
+ * @prop {string}  hint     - helper text
+ * @prop {boolean} required - red asterisk on label
+ * @prop {number}  rows     - visible rows (default 4)
+ * @prop {boolean} resize   - allow manual resize (default false)
+ */
+const Textarea = forwardRef(function Textarea(
+  { label, error, hint, required, rows = 4, resize = false, id, className = '', ...rest },
+  ref,
+) {
+  const inputId = id ?? (label ? label.toLowerCase().replace(/\s+/g, '-') : undefined)
+
+  const inputClass = [
+    'block w-full rounded-xl border bg-white/[0.06] text-white text-sm',
+    'px-3.5 py-2.5 placeholder:text-slate-500',
+    'transition-all duration-150',
+    'focus:outline-none focus:ring-2 focus:ring-offset-0',
+    resize ? 'resize-y' : 'resize-none',
+    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',
+    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>
+      )}
+
+      <textarea
+        id={inputId}
+        ref={ref}
+        rows={rows}
+        className={inputClass}
+        aria-invalid={!!error}
+        aria-describedby={error ? `${inputId}-error` : hint ? `${inputId}-hint` : undefined}
+        {...rest}
+      />
+
+      {error && (
+        <p id={`${inputId}-error`} role="alert" className="text-xs text-red-400">
+          {error}
+        </p>
+      )}
+      {!error && hint && (
+        <p id={`${inputId}-hint`} className="text-xs text-slate-500">
+          {hint}
+        </p>
+      )}
+    </div>
+  )
+})
+
+export default Textarea