fix(web): improve mobile control spacing

web/src/components/AuthFooter.tsx

@@ -25,9 +25,9 @@ const AuthFooter = ({ className }: Props) => {
   };
 
   return (
-    <div className={cn("mt-4 flex flex-row items-center justify-center w-full gap-2", className)}>
-      <LocaleSelect value={currentLocale} onChange={handleLocaleChange} />
-      <ThemeSelect value={currentTheme} onValueChange={handleThemeChange} />
+    <div className={cn("mx-auto mt-4 grid w-full max-w-xs grid-cols-2 gap-2", className)}>
+      <LocaleSelect value={currentLocale} onChange={handleLocaleChange} className="w-full" />
+      <ThemeSelect value={currentTheme} onValueChange={handleThemeChange} className="w-full" compact />
     </div>
   );
 };

web/src/components/LocalePicker.tsx

@@ -28,8 +28,13 @@ export const LocaleSearchList = (props: LocaleSearchListProps) => {
   );
 
   return (
-    <div className={cn("w-64 max-w-[calc(100vw-2rem)]", className)}>
-      <div className="relative p-1">
+    <div
+      className={cn(
+        "flex max-h-[min(24rem,calc(100vh-2rem))] w-[var(--radix-popover-trigger-width)] min-w-48 max-w-[calc(100vw-2rem)] flex-col",
+        className,
+      )}
+    >
+      <div className="relative shrink-0 p-1">
         <SearchIcon className="absolute top-1/2 left-3 size-4 -translate-y-1/2 text-muted-foreground" />
         <Input
           value={query}
@@ -40,7 +45,7 @@ export const LocaleSearchList = (props: LocaleSearchListProps) => {
           aria-label={t("common.language")}
         />
       </div>
-      <div className="mt-1 max-h-72 overflow-y-auto p-1" role="listbox" aria-label={t("common.language")}>
+      <div className="mt-1 min-h-0 flex-1 touch-pan-y overflow-y-auto p-1" role="listbox" aria-label={t("common.language")}>
         {filteredLocales.map((locale) => (
           <button
             type="button"
@@ -53,9 +58,11 @@ export const LocaleSearchList = (props: LocaleSearchListProps) => {
             )}
             onClick={() => onChange(locale)}
           >
-            {value === locale ? <CheckIcon className="size-4 text-primary" /> : <span className="size-4" />}
-            <span className="min-w-0 flex-1 truncate">{getLocaleDisplayName(locale)}</span>
-            <span className="shrink-0 text-xs text-muted-foreground">{locale}</span>
+            <span className="flex min-w-0 flex-1 items-baseline gap-1.5">
+              <span className="truncate">{getLocaleDisplayName(locale)}</span>
+              <span className="shrink-0 text-xs text-muted-foreground">{locale}</span>
+            </span>
+            {value === locale ? <CheckIcon className="size-4 shrink-0 text-primary" /> : <span className="size-4 shrink-0" />}
           </button>
         ))}
         {filteredLocales.length === 0 && (
@@ -94,11 +101,11 @@ const LocalePicker = (props: LocalePickerProps) => {
     <Popover open={open} onOpenChange={setOpen}>
       <PopoverTrigger asChild>
         <Button type="button" variant="outline" className={cn("w-full justify-between", className)}>
-          <span className="flex min-w-0 items-center gap-2">
-            <GlobeIcon className="size-4 text-muted-foreground" />
+          <span className="flex min-w-0 flex-1 items-center gap-2">
+            <GlobeIcon className="size-4 shrink-0 text-muted-foreground" />
             <span className="truncate">{getLocaleDisplayName(value)}</span>
           </span>
-          <ChevronDownIcon className="size-4 text-muted-foreground" />
+          <ChevronDownIcon className="size-4 shrink-0 text-muted-foreground" />
         </Button>
       </PopoverTrigger>
       <PopoverContent align="start" className="p-0">

web/src/components/LocaleSelect.tsx

@@ -5,10 +5,11 @@ import { loadLocale } from "@/utils/i18n";
 interface Props {
   value: Locale;
   onChange: (locale: Locale) => void;
+  className?: string;
 }
 
 const LocaleSelect: FC<Props> = (props: Props) => {
-  const { onChange, value } = props;
+  const { className, onChange, value } = props;
 
   const handleSelectChange = async (locale: Locale) => {
     // Apply locale globally immediately
@@ -17,7 +18,7 @@ const LocaleSelect: FC<Props> = (props: Props) => {
     onChange(locale);
   };
 
-  return <LocalePicker value={value} onChange={handleSelectChange} />;
+  return <LocalePicker value={value} onChange={handleSelectChange} className={className} />;
 };
 
 export default LocaleSelect;

web/src/components/ThemeSelect.tsx

@@ -7,6 +7,7 @@ interface ThemeSelectProps {
   value?: string;
   onValueChange?: (theme: string) => void;
   className?: string;
+  compact?: boolean;
 }
 
 const THEME_ICONS: Record<string, ReactElement> = {
@@ -16,8 +17,9 @@ const THEME_ICONS: Record<string, ReactElement> = {
   paper: <Palette className="w-4 h-4" />,
 };
 
-const ThemeSelect = ({ value, onValueChange, className }: ThemeSelectProps = {}) => {
+const ThemeSelect = ({ value, onValueChange, className, compact = false }: ThemeSelectProps = {}) => {
   const currentTheme = value || "system";
+  const triggerLabel = currentTheme === "system" ? "System" : THEME_OPTIONS.find((option) => option.value === currentTheme)?.label;
 
   const handleThemeChange = (newTheme: string) => {
     // Apply theme globally immediately
@@ -31,8 +33,9 @@ const ThemeSelect = ({ value, onValueChange, className }: ThemeSelectProps = {})
   return (
     <Select value={currentTheme} onValueChange={handleThemeChange}>
       <SelectTrigger className={className}>
-        <div className="flex items-center gap-2">
-          <SelectValue placeholder="Select theme" />
+        <div className="flex min-w-0 flex-1 items-center gap-2">
+          {compact && THEME_ICONS[currentTheme]}
+          {compact ? <span className="truncate">{triggerLabel}</span> : <SelectValue className="truncate" placeholder="Select theme" />}
         </div>
       </SelectTrigger>
       <SelectContent>

web/src/components/UserMenu.tsx

@@ -151,8 +151,8 @@ const UserMenu = (props: Props) => {
             <GlobeIcon className="size-4 text-muted-foreground" />
             {t("common.language")}
           </DropdownMenuSubTrigger>
-          <DropdownMenuSubContent className="p-0">
-            <LocaleSearchList value={currentLocale} onChange={handleLocaleChange} />
+          <DropdownMenuSubContent className="max-h-[min(24rem,var(--radix-dropdown-menu-content-available-height))] overflow-y-auto p-0">
+            <LocaleSearchList value={currentLocale} onChange={handleLocaleChange} className="w-64" />
           </DropdownMenuSubContent>
         </DropdownMenuSub>
         <DropdownMenuSub>

web/src/pages/About.tsx

@@ -83,7 +83,7 @@ const SponsorLogo = ({ sponsor }: { sponsor: Sponsor }) => {
 const About = () => {
   return (
     <section className="mx-auto w-full max-w-5xl min-h-full flex flex-col justify-start items-start sm:pt-3 md:pt-6 pb-8">
-      <div className="w-full px-4 sm:px-6">
+      <div className="w-full">
         <div className="w-full rounded-xl border border-border bg-background px-4 py-4 text-muted-foreground">
           <SettingSection
             title="About Memos"

web/tests/about-page.test.tsx

@@ -41,6 +41,15 @@ describe("<About>", () => {
     }
   });
 
+  it("does not add nested horizontal page padding on mobile", () => {
+    const { container } = render(<About />);
+
+    const contentWrapper = container.querySelector("section > div");
+
+    expect(contentWrapper).toHaveClass("w-full");
+    expect(contentWrapper).not.toHaveClass("px-4");
+  });
+
   it("uses dark sponsor logos when the app theme is dark", () => {
     document.documentElement.setAttribute("data-theme", "default-dark");