fix(about): use distinct builtAtLabel key for the build-time row

The build-time row read its label from `t("builtAt", { time: "" }).trim()`
with a fallback to the gitSha key. The fallback was effectively dead
(the trim never produced an empty string) and the pattern silently
risked rendering two side-by-side "Build" columns when an
implementer dropped the trailing `{time}` placeholder. Replace with
a dedicated `settings.about.builtAtLabel` key across all six locales.

messages/de.json

@@ -1940,6 +1940,7 @@
       "version": "App-Version",
       "gitSha": "Build",
       "builtAt": "Erstellt {time}",
+      "builtAtLabel": "Erstellt",
       "license": "Lizenz",
       "repository": "Quellcode",
       "changelog": "Changelog",

messages/en.json

@@ -1940,6 +1940,7 @@
       "version": "App version",
       "gitSha": "Build",
       "builtAt": "Built {time}",
+      "builtAtLabel": "Built",
       "license": "License",
       "repository": "Source code",
       "changelog": "Changelog",

messages/es.json

@@ -1940,6 +1940,7 @@
       "version": "App version",
       "gitSha": "Build",
       "builtAt": "Built {time}",
+      "builtAtLabel": "Built",
       "license": "License",
       "repository": "Source code",
       "changelog": "Changelog",

messages/fr.json

@@ -1940,6 +1940,7 @@
       "version": "App version",
       "gitSha": "Build",
       "builtAt": "Built {time}",
+      "builtAtLabel": "Built",
       "license": "License",
       "repository": "Source code",
       "changelog": "Changelog",

messages/it.json

@@ -1940,6 +1940,7 @@
       "version": "App version",
       "gitSha": "Build",
       "builtAt": "Built {time}",
+      "builtAtLabel": "Built",
       "license": "License",
       "repository": "Source code",
       "changelog": "Changelog",

messages/pl.json

@@ -1940,6 +1940,7 @@
       "version": "App version",
       "gitSha": "Build",
       "builtAt": "Built {time}",
+      "builtAtLabel": "Built",
       "license": "License",
       "repository": "Source code",
       "changelog": "Changelog",

src/components/settings/__tests__/about-section-update-badge.test.tsx

@@ -99,6 +99,17 @@ describe("<AboutSection> — update badge", () => {
     const html = render(<AboutSection />);
     expect(html).toContain("Sources &amp; docs");
   });
+
+  it("uses a dedicated 'Built' label for the build-time row rather than the gitSha fallback", () => {
+    const html = render(<AboutSection />);
+    // Distinct label keeps the dt copy separate from the "Build" gitSha
+    // header above it; the prior `t('builtAt', { time: '' }).trim()`
+    // pattern silently leaked the gitSha key as a fallback.
+    expect(html).toContain(">Built<");
+    // Only ONE column should ever read "Build" — the gitSha header.
+    const buildOccurrences = html.match(/>Build</g) ?? [];
+    expect(buildOccurrences.length).toBe(1);
+  });
 });
 
 describe("<UpdateBadge> — a11y contract", () => {

src/components/settings/about-section.tsx

@@ -260,8 +260,7 @@ export function AboutSection() {
             {version.builtAt && (
               <div className="flex items-baseline gap-2">
                 <dt className="text-muted-foreground text-xs tracking-wide uppercase">
-                  {t("settings.about.builtAt", { time: "" }).trim() ||
-                    t("settings.about.gitSha")}
+                  {t("settings.about.builtAtLabel")}
                 </dt>
                 <dd className="text-muted-foreground">
                   {fmt.date(version.builtAt)}