feat(ui): extract a shared NativeSelect primitive and migrate three call sites

v1.4.27 MB7 / CF-52 — three settings/admin surfaces each declared a
local `NATIVE_SELECT_CLASS` constant tracing the same visual contract
as the shadcn `<SelectTrigger>`. The copies had drifted slightly so
`AccountSection`, `TimezonePicker`, and `GeneralSettingsSection`
rendered at subtly different focus-ring weights. The new
`<NativeSelect>` primitive owns the contract; all three call sites
import it and the in-file constants retire. The native picker remains
the right experience for the 400-entry timezone list and the
admin-only locale dropdowns, so the primitive deliberately stays on a
styled `<select>` rather than wrapping the radix popover-driven
`<Select>`.

src/components/admin/general-settings-section.tsx

@@ -3,11 +3,16 @@
 import { useMemo } from "react";
 import { Settings } from "lucide-react";
 import { useTranslations } from "@/lib/i18n/context";
+import { NativeSelect } from "@/components/ui/native-select";
 import { SettingsToggle, useAdminSettings, useUpdateSettings } from "./_shared";
 import { listSupportedTimezones } from "@/lib/tz/format";
 
-const NATIVE_SELECT_CLASS =
-  "border-input bg-background text-foreground ring-offset-background focus-visible:ring-ring flex h-9 rounded-md border px-3 py-1 text-sm shadow-xs transition-[color,box-shadow] focus-visible:ring-[3px] focus-visible:outline-none";
+// v1.4.27 MB7 / CF-52 — the in-file `NATIVE_SELECT_CLASS` constant
+// retired; the shared `<NativeSelect>` primitive owns the visual
+// contract now. The admin copy previously diverged on the
+// `focus-visible:ring-[3px]` weight; the shared primitive pins
+// `focus-visible:ring-2` so admin selects match the rest of the form
+// surface.
 
 export function GeneralSettingsSection() {
   const { t } = useTranslations();
@@ -43,17 +48,17 @@ export function GeneralSettingsSection() {
               {t("admin.defaultLanguageDescription")}
             </p>
           </div>
-          <select
+          <NativeSelect
             value={settings?.defaultLocale ?? "de"}
             onChange={(e) =>
               updateSettings.mutate({ defaultLocale: e.target.value })
             }
             disabled={updateSettings.isPending}
-            className={NATIVE_SELECT_CLASS}
+            className="w-auto"
           >
             <option value="de">Deutsch</option>
             <option value="en">English</option>
-          </select>
+          </NativeSelect>
         </div>
 
         {/* v1.4.25 W7 — server-wide default timezone for new
@@ -69,13 +74,13 @@ export function GeneralSettingsSection() {
               {t("admin.defaultUserTimezoneDescription")}
             </p>
           </div>
-          <select
+          <NativeSelect
             value={currentDefaultTz}
             onChange={(e) =>
               updateSettings.mutate({ defaultUserTimezone: e.target.value })
             }
             disabled={updateSettings.isPending}
-            className={NATIVE_SELECT_CLASS}
+            className="sm:w-auto"
           >
             <option value="">{t("admin.defaultUserTimezoneFallback")}</option>
             {/* Preserve the stored value even if it's not in the
@@ -88,7 +93,7 @@ export function GeneralSettingsSection() {
                 {zone}
               </option>
             ))}
-          </select>
+          </NativeSelect>
         </div>
       </div>
     </div>

src/components/settings/account-section.tsx

@@ -37,6 +37,7 @@ import {
 import { Input } from "@/components/ui/input";
 import { DateInput } from "@/components/ui/date-input";
 import { Label } from "@/components/ui/label";
+import { NativeSelect } from "@/components/ui/native-select";
 import { PasswordInput } from "@/components/ui/password-input";
 import { useAuth } from "@/hooks/use-auth";
 import { formatDate } from "@/lib/format";
@@ -53,15 +54,10 @@ interface PasskeyInfo {
   createdAt: string;
 }
 
-/**
- * Shared class string for native `<select>` elements inside the Account
- * card. Mirrors the visual contract of `<Input>` and shadcn
- * `<SelectTrigger>` (`h-9`, identical border/focus tokens) so gender,
- * language, and any future native dropdown render at the same height
- * and width as every other input in the form.
- */
-const NATIVE_SELECT_CLASS =
-  "border-input bg-background text-foreground ring-offset-background placeholder:text-muted-foreground focus-visible:ring-ring flex h-9 w-full rounded-md border px-3 py-1 text-sm focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none";
+// v1.4.27 MB7 / CF-52 — the in-file `NATIVE_SELECT_CLASS` constant
+// retired; the shared `<NativeSelect>` primitive owns the visual
+// contract now. Existing `<select className={NATIVE_SELECT_CLASS}>`
+// call sites in this file swapped to `<NativeSelect>` below.
 
 export function AccountSection() {
   const { t, locale, setLocale } = useTranslations();
@@ -380,16 +376,15 @@ export function AccountSection() {
           <div className="grid gap-4 sm:grid-cols-2">
             <div className="space-y-2">
               <Label htmlFor="gender">{t("settings.gender")}</Label>
-              <select
+              <NativeSelect
                 id="gender"
                 value={gender}
                 onChange={(e) => setGender(e.target.value)}
-                className={NATIVE_SELECT_CLASS}
               >
                 <option value="">{t("settings.genderNone")}</option>
                 <option value="MALE">{t("settings.genderMale")}</option>
                 <option value="FEMALE">{t("settings.genderFemale")}</option>
-              </select>
+              </NativeSelect>
               <p className="text-muted-foreground text-xs">
                 {t("settings.genderHint")}
               </p>
@@ -432,18 +427,17 @@ export function AccountSection() {
             </div>
             <div className="space-y-2">
               <Label htmlFor="language-select">{t("settings.language")}</Label>
-              <select
+              <NativeSelect
                 id="language-select"
                 value={locale}
                 onChange={(e) => setLocale(e.target.value as Locale)}
-                className={NATIVE_SELECT_CLASS}
               >
                 {locales.map((loc) => (
                   <option key={loc} value={loc}>
                     {localeLabels[loc as Locale]}
                   </option>
                 ))}
-              </select>
+              </NativeSelect>
               <p className="text-muted-foreground text-xs">
                 {t("settings.languageDescription")}
               </p>

src/components/settings/timezone-picker.tsx

@@ -21,14 +21,17 @@ import { Compass } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
+import { NativeSelect } from "@/components/ui/native-select";
 import {
   detectBrowserTimezone,
   listSupportedTimezones,
 } from "@/lib/tz/format";
 import { useTranslations } from "@/lib/i18n/context";
 
-const NATIVE_SELECT_CLASS =
-  "border-input bg-background text-foreground ring-offset-background placeholder:text-muted-foreground focus-visible:ring-ring flex h-9 w-full rounded-md border px-3 py-1 text-sm focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none";
+// v1.4.27 MB7 / CF-52 — the in-file `NATIVE_SELECT_CLASS` constant
+// retired; the shared `<NativeSelect>` primitive owns the visual
+// contract now. The `sm:max-w-sm` modifier still composes via the
+// `className` prop below so the picker keeps its narrow desktop width.
 
 export interface TimezonePickerProps {
   /** The user's current stored timezone. */
@@ -89,11 +92,11 @@ export function TimezonePicker({
     <div className="space-y-2">
       <Label htmlFor={id}>{t("settings.timezone")}</Label>
       <div className="flex flex-col gap-3 sm:flex-row sm:items-center">
-        <select
+        <NativeSelect
           id={id}
           value={value}
           onChange={(e) => onChange(e.target.value)}
-          className={`${NATIVE_SELECT_CLASS} sm:max-w-sm`}
+          className="sm:max-w-sm"
         >
           {/* Preserve the stored value even if the runtime's IANA
               list changed across engines or tzdata rolls. */}
@@ -105,7 +108,7 @@ export function TimezonePicker({
               {zone}
             </option>
           ))}
-        </select>
+        </NativeSelect>
         <Button
           type="button"
           variant="outline"

src/components/ui/native-select.tsx

@@ -0,0 +1,51 @@
+"use client";
+
+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+/**
+ * v1.4.27 MB7 / CF-52 — shared `<select>` primitive.
+ *
+ * Three settings/admin surfaces (`AccountSection`, `TimezonePicker`,
+ * `GeneralSettingsSection`) each declared a local `NATIVE_SELECT_CLASS`
+ * constant that traced the same visual contract as the shadcn
+ * `<SelectTrigger>` (border + bg + ring tokens, `h-9` floor, identical
+ * focus vocabulary). The three copies had drifted slightly — one
+ * dropped `w-full`, another dropped the `shadow-xs` token — so the
+ * three forms rendered at subtly different weights despite reading
+ * "the same select" to the user.
+ *
+ * The primitive collapses the duplicates. Consumers wrap it like a
+ * raw `<select>` and the className still composes via `cn(...)` so
+ * site-specific tweaks (`sm:max-w-sm`, etc.) keep working.
+ *
+ * Why native? The shadcn `<Select>` from `@radix-ui/react-select` is
+ * the better keyboard experience on desktop but pulls in extra
+ * client JS and does not show the iOS / Android native picker.
+ * Settings/admin surfaces benefit from the native picker (especially
+ * for the 400-entry timezone list) so we deliberately stay on
+ * `<select>` here. The styled primitive keeps the visual rhythm
+ * uniform with the rest of the form's `<Input>` + `<SelectTrigger>`
+ * rows.
+ */
+const NATIVE_SELECT_CLASS =
+  "border-input bg-background text-foreground ring-offset-background placeholder:text-muted-foreground focus-visible:ring-ring flex h-9 w-full rounded-md border px-3 py-1 text-sm shadow-xs transition-[color,box-shadow] focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none";
+
+export type NativeSelectProps = React.SelectHTMLAttributes<HTMLSelectElement>;
+
+export const NativeSelect = React.forwardRef<
+  HTMLSelectElement,
+  NativeSelectProps
+>(function NativeSelect({ className, children, ...props }, ref) {
+  return (
+    <select
+      ref={ref}
+      data-slot="native-select"
+      className={cn(NATIVE_SELECT_CLASS, className)}
+      {...props}
+    >
+      {children}
+    </select>
+  );
+});