fix(design): the nav rail's footer rows (language, About, Sign out) share the rail row and glyph (E28)

frontend/src/components/LanguageSwitcher.tsx

@@ -4,6 +4,7 @@ import { LANGUAGES, type LangCode } from "../i18n";
 import { PopoverItem, PopoverSurface } from "./ui/AnchoredPopover";
 import { useAnchoredPopover } from "./ui/anchoredPopoverHooks";
 import { Pressable } from "./ui/Pressable";
+import { RAIL_GLYPH, RAIL_ROW } from "./ui/NavRail";
 import { SURFACE } from "./ui/surfaces";
 
 // Compact language picker (globe + current code). Presentational: the parent decides what
@@ -52,20 +53,23 @@ export default function LanguageSwitcher({
         layer
         className={
           rail
-            ? "relative p-2 rounded-lg text-muted hover:text-fg transition touch-target"
+            ? `${RAIL_ROW} h-9 text-muted hover:text-fg`
             : "flex h-7 items-center gap-1.5 px-2.5 rounded-lg text-sm text-muted hover:text-fg transition touch-target"
         }
       >
-        <Globe className={rail ? "w-5 h-5" : "w-4 h-4"} />
         {rail ? (
-          /* Current-language badge (HU/EN) so the active language reads at a glance without
-             opening the menu. The ring matches the page background to detach it from the icon. */
-          <span className="absolute -bottom-1 -right-1 text-[0.5rem] font-bold leading-none px-1 py-px rounded-sm bg-accent text-accent-fg ring-2 ring-bg">
-            {current.code.toUpperCase()}
+          /* A rail row (F32), with the current-language badge (HU/EN) on the glyph's corner so the
+             active language reads at a glance. The ring matches the page to detach it from the icon. */
+          <span className="relative">
+            <Globe className={RAIL_GLYPH} />
+            <span className="absolute -bottom-1.5 -right-2.5 text-[0.5rem] font-bold leading-none px-1 py-px rounded-sm bg-accent text-accent-fg ring-2 ring-bg">
+              {current.code.toUpperCase()}
+            </span>
           </span>
         ) : (
-          <span className="text-xs font-semibold uppercase">{current.code}</span>
+          <Globe className="w-4 h-4" />
         )}
+        {rail ? null : <span className="text-xs font-semibold uppercase">{current.code}</span>}
       </Pressable>
 
       <PopoverSurface popover={pop} className={`${SURFACE.menu} w-40 animate-[popIn_0.16s_ease]`}>

frontend/src/components/NavSidebar.tsx

@@ -20,14 +20,20 @@ import {
 } from "../lib/modules";
 import { useScrollFade } from "../lib/useScrollFade";
 import { type LangCode } from "../i18n";
-import { IconButton } from "./ui/IconButton";
 import AvatarImg from "./ui/Avatar";
 import LanguageSwitcher from "./LanguageSwitcher";
 import { PopoverSurface } from "./ui/AnchoredPopover";
 import { useAnchoredPopover } from "./ui/anchoredPopoverHooks";
 import { Pressable } from "./ui/Pressable";
 import { SURFACE } from "./ui/surfaces";
-import { NavRail, NavRailDivider, NavRailItem, NavRailList, RAIL_ROW } from "./ui/NavRail";
+import {
+  NavRail,
+  NavRailAction,
+  NavRailDivider,
+  NavRailItem,
+  NavRailList,
+  RAIL_ROW,
+} from "./ui/NavRail";
 import { usePrefs } from "./prefsContext";
 
 // Primary app navigation: a thin icon-only left rail. The modules used to hide under the avatar
@@ -196,24 +202,10 @@ export default function NavSidebar({
         </NavRailList>
 
         <div className="mt-2 pt-2 border-t border-border flex flex-col gap-1">
-          <div className="flex flex-col items-center justify-center gap-2 pb-2 mb-1 border-b border-border">
+          <div className="flex flex-col gap-1 pb-2 mb-1 border-b border-border">
             <LanguageSwitcher variant="rail" value={language} onChange={onChangeLanguage} />
-            <IconButton
-              label={t("header.account.about")}
-              size="md"
-              variant="ghost"
-              onClick={onOpenAbout}
-            >
-              <Info className="w-5 h-5" />
-            </IconButton>
-            <IconButton
-              label={t("header.account.signOut")}
-              size="md"
-              variant="ghost"
-              onClick={logout}
-            >
-              <LogOut className="w-5 h-5" />
-            </IconButton>
+            <NavRailAction icon={Info} label={t("header.account.about")} onClick={onOpenAbout} />
+            <NavRailAction icon={LogOut} label={t("header.account.signOut")} onClick={logout} />
           </div>
           <NavRailItem
             testId="nav-settings"

frontend/src/components/ui/NavRail.dom.test.tsx

@@ -3,10 +3,12 @@
 // E28 S3d (B7): the nav rail's row. Icon-only, its name is the module's full name (with an unread
 // count, which was only ever drawn); with the labels on, the name is the short label the user SEES
 // (WCAG 2.5.3), the full one staying in the tooltip. "You are here" is aria-current plus the tint.
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { cleanup, render, screen } from "@testing-library/react";
 import { Bell } from "lucide-react";
-import { NavRailItem } from "./NavRail";
+import { NavRailAction, NavRailItem } from "./NavRail";
 
 vi.mock("../../lib/hints", () => ({ hintsEnabled: () => true, subscribeHints: () => () => {} }));
 
@@ -45,3 +47,20 @@ describe("NavRailItem", () => {
     expect(row.getAttribute("aria-current")).toBeNull();
   });
 });
+
+// F32: the rail's footer (language, About, Sign out) drew 32 and 36 squares with 16 and 20px glyphs
+// beside the 36-tall full-width rows, so its spacing and glyphs broke the column. An action is a row too.
+describe("NavRailAction", () => {
+  it("is a named rail row, not a toolbar icon button", () => {
+    render(<NavRailAction icon={Bell} label="About" onClick={() => {}} />);
+    const row = screen.getByRole("button", { name: "About" });
+    expect(row.className).toContain("h-9");
+    expect(row.className).toContain("w-full");
+    expect(row.querySelector("svg")?.getAttribute("class")).toContain("size-4.5");
+  });
+
+  it("the nav rail holds no toolbar icon button", () => {
+    const src = readFileSync(resolve(__dirname, "../NavSidebar.tsx"), "utf8");
+    expect(src).not.toMatch(/<IconButton[\s>]/);
+  });
+});

frontend/src/components/ui/NavRail.tsx

@@ -62,6 +62,9 @@ export function NavRailDivider() {
   return <div className="mx-auto my-1.5 w-7 shrink-0 border-t-2 border-border" />;
 }
 
+/** The glyph of every rail row: a page, an action, the language switcher. */
+export const RAIL_GLYPH = "size-4.5";
+
 /** The shape of one rail row, for a row that is not a page (the account button). */
 export const RAIL_ROW =
   "relative flex w-full flex-col items-center justify-center gap-0.5 rounded-lg transition touch-target";
@@ -112,7 +115,7 @@ export function NavRailItem({
           />
         )}
         <span className="relative shrink-0">
-          <Icon className="size-4.5" aria-hidden="true" />
+          <Icon className={RAIL_GLYPH} aria-hidden="true" />
           {shown && (
             <span className="absolute -top-2 -right-2 grid h-4 min-w-4 place-items-center rounded-full bg-accent px-1 text-3xs leading-none font-bold text-accent-fg ring-2 ring-bg">
               {badge > 9 ? "9+" : badge}
@@ -128,3 +131,28 @@ export function NavRailItem({
     </Tooltip>
   );
 }
+
+/** A rail row that acts instead of navigating (About, Sign out): the page rows' geometry and glyph, so
+ *  the column keeps one rhythm (F32: toolbar icon buttons here drew 32 squares with 16px glyphs). */
+export function NavRailAction({
+  icon: Icon,
+  label,
+  onClick,
+}: {
+  icon: LucideIcon;
+  /** The tooltip and the accessible name. */
+  label: string;
+  onClick: () => void;
+}) {
+  return (
+    <Tooltip hint={label} side="right" always openDelay={350}>
+      <Pressable
+        onClick={onClick}
+        aria-label={label}
+        className={clsx(RAIL_ROW, "h-9 text-muted state-layer hover:text-fg")}
+      >
+        <Icon className={RAIL_GLYPH} aria-hidden="true" />
+      </Pressable>
+    </Tooltip>
+  );
+}