feat(header): make nav-vs-burger decision per-language by measuring fit

Each translation gives the nav a different natural width: Malay's 6 labels
total ~594px while Chinese is ~508px. With a fixed Tailwind breakpoint
(`xl:flex`) some languages either clipped at viewports where the nav
technically didn't fit, or collapsed too early to a burger on wide screens.

Drive the toggle from runtime measurement instead:

- Always render a hidden ghost nav (`absolute invisible`) so the browser
  can report the inline nav's true scrollWidth for the active locale,
  even while we're showing the burger.
- Add refs on the header row, brand block, and right-side actions; a
  useLayoutEffect + ResizeObserver compares ghost.scrollWidth against
  (rowWidth - brandWidth - rightWidth - 2*rowGap).
- 60px hysteresis on burger -> inline so the layout doesn't oscillate
  when the favorites label / burger button swap changes right-side width.
- Drop the now-unused `xl:flex`, `xl:hidden`, `xl:flex-none`,
  `xl:inline` classes from the affected elements.
- Close the burger drawer automatically when the row grows wide enough
  to show the inline nav again, so the menu doesn't get stuck without
  a toggle.

Verified via puppeteer/eval across en / zh-CN / zh-TW / ms / ru / de at
800-2000px: each language switches to burger at its own threshold and
the inline nav never overflows or clips its labels.

src/layouts/PublicLayout.tsx

@@ -6,7 +6,7 @@ import {
   X,
 } from "lucide-react";
 import { AnimatePresence, m } from "framer-motion";
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useLayoutEffect, useRef, useState } from "react";
 import { Link, useLocation, useNavigate, useOutlet } from "react-router-dom";
 import { pageTransition } from "../motion";
 import { ArkLogoMark } from "../components/ArkLogoMark";
@@ -309,6 +309,17 @@ export function PublicLayout() {
   const desktopMenuButtonRef = useRef<HTMLButtonElement>(null);
   const desktopSearchRef = useRef<HTMLDivElement>(null);
   const desktopSearchPanelRef = useRef<HTMLDivElement>(null);
+  // Runtime fit detection for the desktop nav. Different languages and page
+  // titles change the natural width of the nav and brand, so a fixed CSS
+  // breakpoint (e.g. `xl:flex`) clips or overlaps text in some translations.
+  // Instead we render a hidden “ghost” nav, measure its scrollWidth against
+  // the space left after the brand + right-side actions, and toggle to the
+  // burger menu the moment it would no longer fit.
+  const [showInlineNav, setShowInlineNav] = useState(true);
+  const headerRowRef = useRef<HTMLDivElement>(null);
+  const headerBrandRef = useRef<HTMLDivElement>(null);
+  const headerRightRef = useRef<HTMLDivElement>(null);
+  const ghostNavRef = useRef<HTMLElement>(null);
   const nav = useNavigate();
   const lp = useLocalizedPath();
 
@@ -387,6 +398,50 @@ export function PublicLayout() {
   }, [lang]);
   const popularHref = lp("/browse?sort=popular");
 
+  // Decide whether the inline nav fits next to the brand and right-side
+  // actions for the current language. Hysteresis (60px) on the
+  // burger -> inline transition keeps the layout from oscillating when the
+  // right-side width shrinks slightly after we hide the burger button.
+  useLayoutEffect(() => {
+    const row = headerRowRef.current;
+    const brand = headerBrandRef.current;
+    const right = headerRightRef.current;
+    const ghost = ghostNavRef.current;
+    if (!row || !brand || !right || !ghost) return;
+
+    const measure = () => {
+      const rowWidth = row.clientWidth;
+      if (rowWidth === 0) return;
+      const rowStyle = window.getComputedStyle(row);
+      const rowGap = parseFloat(rowStyle.columnGap || rowStyle.gap || "0");
+      const totalGap = rowGap * 2; // brand <-> nav <-> right
+      const available =
+        rowWidth - brand.offsetWidth - right.offsetWidth - totalGap;
+      const needed = ghost.scrollWidth;
+
+      setShowInlineNav((current) => {
+        if (current) return needed <= available;
+        // Need real breathing room before switching back, to avoid flicker
+        // when the right-side width shrinks after the burger button hides.
+        return needed + 60 <= available;
+      });
+    };
+
+    measure();
+    const ro = new ResizeObserver(measure);
+    ro.observe(row);
+    ro.observe(ghost);
+    ro.observe(brand);
+    ro.observe(right);
+    return () => ro.disconnect();
+  }, [lang, pageTitle, t]);
+
+  // When the layout grows enough that we move back to the inline nav, the
+  // burger drawer would otherwise stay stuck open with no visible toggle.
+  useEffect(() => {
+    if (showInlineNav) setOpen(false);
+  }, [showInlineNav]);
+
   const goSearch = () => {
     const s = q.trim();
     if (!s) return;
@@ -611,12 +666,18 @@ export function PublicLayout() {
         </div>
 
         <div className="hidden w-full px-4 py-[15px] min-[440px]:px-5 sm:px-6 md:block md:px-9 xl:px-10">
-          {/* Single row (md+): logo | nav | search + language. Header now spans
-              the full viewport so wide monitors get more breathing room, and
-              the nav switches to the burger menu at `xl` so it never has to
-              clip / horizontally-scroll the labels. */}
-          <div className="flex h-10 items-center gap-2 xl:gap-4">
-            <div className="flex min-w-0 shrink items-center gap-2.5 text-xl font-bold tracking-wide text-ark-gold">
+          {/* Single row (md+): logo | nav | search + language. The nav and the
+              burger toggle are driven by a runtime fit measurement (see
+              useLayoutEffect above) instead of a fixed Tailwind breakpoint,
+              so each language collapses to the burger at its own width. */}
+          <div
+            ref={headerRowRef}
+            className="relative flex h-10 items-center gap-2 xl:gap-4"
+          >
+            <div
+              ref={headerBrandRef}
+              className="flex min-w-0 shrink items-center gap-2.5 text-xl font-bold tracking-wide text-ark-gold"
+            >
               {/* Logo → home; page-name text → scroll to top of the current page. */}
               <Link
                 to={homePath}
@@ -640,55 +701,79 @@ export function PublicLayout() {
               </button>
             </div>
 
+            {/* Hidden measurement copy of the nav. Always rendered so the
+                ResizeObserver can ask the browser “how wide would the inline
+                nav need to be?” without flickering the visible layout. */}
             <nav
-              className="hidden min-w-0 flex-1 items-center justify-center gap-4 py-0.5 xl:flex xl:gap-5"
-              aria-label={t("mainNav")}
+              ref={ghostNavRef}
+              aria-hidden
+              tabIndex={-1}
+              className="pointer-events-none invisible absolute left-0 top-0 flex h-10 items-center gap-4 py-0.5 whitespace-nowrap xl:gap-5"
             >
-              <Link
-                to={lp("/browse")}
-                className={navClassName(na("browseAll"))}
-                aria-current={na("browseAll") ? "page" : undefined}
-              >
-                {t("all")}
-              </Link>
-              <Link
-                to={lp("/categories")}
-                className={navClassName(na("categories"))}
-                aria-current={na("categories") ? "page" : undefined}
-              >
-                {t("categories")}
-              </Link>
-              <Link
-                to={lp("/official-recommendations")}
-                className={navClassName(na("browseRecommended"))}
-                aria-current={na("browseRecommended") ? "page" : undefined}
-              >
-                {t("official")}
-              </Link>
-              <Link
-                to={lp("/browse?sort=latest")}
-                className={navClassName(na("browseLatest"))}
-                aria-current={na("browseLatest") ? "page" : undefined}
-              >
-                {t("latest")}
-              </Link>
-              <Link
-                to={lp("/favorites")}
-                className={navClassName(na("favorites"))}
-                aria-current={na("favorites") ? "page" : undefined}
-              >
-                {t("favorites")}
-              </Link>
-              <Link
-                to={popularHref}
-                className={navClassName(na("browsePopular"))}
-                aria-current={na("browsePopular") ? "page" : undefined}
-              >
-                {t("popular")}
-              </Link>
+              <span className={navClassName(false)}>{t("all")}</span>
+              <span className={navClassName(false)}>{t("categories")}</span>
+              <span className={navClassName(false)}>{t("official")}</span>
+              <span className={navClassName(false)}>{t("latest")}</span>
+              <span className={navClassName(false)}>{t("favorites")}</span>
+              <span className={navClassName(false)}>{t("popular")}</span>
             </nav>
 
-            <div className="flex min-w-0 flex-1 items-center justify-end gap-2 xl:flex-none">
+            {showInlineNav ? (
+              <nav
+                className="flex min-w-0 flex-1 items-center justify-center gap-4 py-0.5 xl:gap-5"
+                aria-label={t("mainNav")}
+              >
+                <Link
+                  to={lp("/browse")}
+                  className={navClassName(na("browseAll"))}
+                  aria-current={na("browseAll") ? "page" : undefined}
+                >
+                  {t("all")}
+                </Link>
+                <Link
+                  to={lp("/categories")}
+                  className={navClassName(na("categories"))}
+                  aria-current={na("categories") ? "page" : undefined}
+                >
+                  {t("categories")}
+                </Link>
+                <Link
+                  to={lp("/official-recommendations")}
+                  className={navClassName(na("browseRecommended"))}
+                  aria-current={na("browseRecommended") ? "page" : undefined}
+                >
+                  {t("official")}
+                </Link>
+                <Link
+                  to={lp("/browse?sort=latest")}
+                  className={navClassName(na("browseLatest"))}
+                  aria-current={na("browseLatest") ? "page" : undefined}
+                >
+                  {t("latest")}
+                </Link>
+                <Link
+                  to={lp("/favorites")}
+                  className={navClassName(na("favorites"))}
+                  aria-current={na("favorites") ? "page" : undefined}
+                >
+                  {t("favorites")}
+                </Link>
+                <Link
+                  to={popularHref}
+                  className={navClassName(na("browsePopular"))}
+                  aria-current={na("browsePopular") ? "page" : undefined}
+                >
+                  {t("popular")}
+                </Link>
+              </nav>
+            ) : (
+              <div className="min-w-0 flex-1" />
+            )}
+
+            <div
+              ref={headerRightRef}
+              className="flex shrink-0 items-center justify-end gap-2"
+            >
               <div ref={desktopSearchRef} className="hidden md:block">
                 <button
                   type="button"
@@ -721,23 +806,27 @@ export function PublicLayout() {
                 aria-current={na("favorites") ? "page" : undefined}
               >
                 <Heart className="h-[18px] w-[18px]" strokeWidth={2.2} />
-                <span className="hidden xl:inline">{t("favorites")}</span>
+                {showInlineNav ? (
+                  <span className="inline">{t("favorites")}</span>
+                ) : null}
               </Link>
               <div className="hidden md:block">
                 <WalletButton />
               </div>
-              <button
-                ref={desktopMenuButtonRef}
-                type="button"
-                className="inline-flex h-10 w-10 shrink-0 items-center justify-center rounded-full border border-ark-line bg-[#1a1b20] text-neutral-200 outline-none focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg xl:hidden"
-                onClick={() => {
-                  setDesktopSearchOpen(false);
-                  setOpen((v) => !v);
-                }}
-                aria-label="menu"
-              >
-                {open ? <X size={18} /> : <Menu size={18} />}
-              </button>
+              {showInlineNav ? null : (
+                <button
+                  ref={desktopMenuButtonRef}
+                  type="button"
+                  className="inline-flex h-10 w-10 shrink-0 items-center justify-center rounded-full border border-ark-line bg-[#1a1b20] text-neutral-200 outline-none focus-visible:ring-2 focus-visible:ring-ark-gold/80 focus-visible:ring-offset-2 focus-visible:ring-offset-ark-bg"
+                  onClick={() => {
+                    setDesktopSearchOpen(false);
+                    setOpen((v) => !v);
+                  }}
+                  aria-label="menu"
+                >
+                  {open ? <X size={18} /> : <Menu size={18} />}
+                </button>
+              )}
             </div>
           </div>
         </div>
@@ -746,7 +835,7 @@ export function PublicLayout() {
       {open ? (
         <div
           ref={menuRef}
-          className={`${headerMenuAnimationClass} fixed inset-x-0 bottom-0 top-[64px] z-50 flex flex-col bg-ark-bg/90 backdrop-blur-xl md:top-[70px] xl:hidden`}
+          className={`${headerMenuAnimationClass} fixed inset-x-0 bottom-0 top-[64px] z-50 flex flex-col bg-ark-bg/90 backdrop-blur-xl md:top-[70px]`}
         >
           <nav className="flex-1 overflow-y-auto px-5">
             {(