init: arcadia-admin — admin webapp for arcadia-core, cloned from vibespace

Initial commit. Spun up via the docs/STARTER.md recipe: cp from vibespace,
reset git, rename package, set brand to "Arcadia Admin" with Shield icon
in app/lib/identity.ts.

Inherits the full Crema sibling-lib wiring including @crema/arcadia-client
(typed HTTP + Phoenix Channels realtime against arcadia-core) and
@crema/arcadia-auth-ui (login/signup/password-reset/2FA forms). The /login
route already renders <LoginForm>; <ArcadiaProvider> in app/root.tsx reads
VITE_ARCADIA_URL (default localhost:4000) and VITE_ARCADIA_TENANT (default
"default").

CLAUDE.md and README rewritten to frame this as the admin app for
arcadia-core. docs/STARTER.md removed — arcadia-admin is a leaf consumer,
not a downstream starter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/components/ui/native-select.tsx

@@ -0,0 +1,61 @@
+import * as React from "react"
+
+import { cn } from "~/lib/utils"
+import { ChevronDownIcon } from "lucide-react"
+
+type NativeSelectProps = Omit<React.ComponentProps<"select">, "size"> & {
+  size?: "sm" | "default"
+}
+
+function NativeSelect({
+  className,
+  size = "default",
+  ...props
+}: NativeSelectProps) {
+  return (
+    <div
+      className={cn(
+        "group/native-select relative w-fit has-[select:disabled]:opacity-50",
+        className
+      )}
+      data-slot="native-select-wrapper"
+      data-size={size}
+    >
+      <select
+        data-slot="native-select"
+        data-size={size}
+        className="h-8 w-full min-w-0 appearance-none rounded-lg border border-input bg-transparent py-1 pr-8 pl-2.5 text-sm transition-colors outline-none select-none selection:bg-primary selection:text-primary-foreground placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:pointer-events-none disabled:cursor-not-allowed aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 data-[size=sm]:h-7 data-[size=sm]:rounded-[min(var(--radius-md),10px)] data-[size=sm]:py-0.5 dark:bg-input/30 dark:hover:bg-input/50 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40"
+        {...props}
+      />
+      <ChevronDownIcon className="pointer-events-none absolute top-1/2 right-2.5 size-4 -translate-y-1/2 text-muted-foreground select-none" aria-hidden="true" data-slot="native-select-icon" />
+    </div>
+  )
+}
+
+function NativeSelectOption({
+  className,
+  ...props
+}: React.ComponentProps<"option">) {
+  return (
+    <option
+      data-slot="native-select-option"
+      className={cn("bg-[Canvas] text-[CanvasText]", className)}
+      {...props}
+    />
+  )
+}
+
+function NativeSelectOptGroup({
+  className,
+  ...props
+}: React.ComponentProps<"optgroup">) {
+  return (
+    <optgroup
+      data-slot="native-select-optgroup"
+      className={cn("bg-[Canvas] text-[CanvasText]", className)}
+      {...props}
+    />
+  )
+}
+
+export { NativeSelect, NativeSelectOptGroup, NativeSelectOption }