feat(chat-header): update guest chat layout and link to character splash

src/app/chat/components/__tests__/tailwind-components.test.tsx

@@ -184,8 +184,9 @@ describe("chat Tailwind components", () => {
     expect(guestHtml).toContain('aria-label="Sign up to unlock more features"');
     expect(guestHtml).toContain("bg-accent");
     expect(guestHtml).toContain("size-(--icon-size-sm,16px)");
-    expect(guestHtml).not.toContain('href="/splash"');
-    expect(guestHtml).not.toContain('aria-label="Back to home"');
+    expect(guestHtml).toContain('href="/characters/elio/splash"');
+    expect(guestHtml).toContain('aria-label="Back to home"');
+    expect(guestHtml).toContain('data-analytics-key="chat.back_to_home"');
     expect(guestHtml).not.toContain('aria-label="Menu"');
     expect(memberHtml).toContain("Offer");
     expect(memberHtml).toContain('href="/characters/elio/splash"');
@@ -216,6 +217,23 @@ describe("chat Tailwind components", () => {
     );
   });
 
+  it("links guest chat back to the active character splash", () => {
+    const maya = getCharacterBySlug("maya");
+    if (!maya) throw new Error("Missing Maya character fixture");
+
+    const html = renderToStaticMarkup(
+      <CharacterProvider character={maya}>
+        <ChatHeader isGuest={true} />
+      </CharacterProvider>,
+    );
+
+    expect(html).toContain('href="/characters/maya/splash"');
+    expect(html).not.toContain('aria-label="Menu"');
+    expect(html).not.toContain(
+      'data-analytics-key="chat.external_browser_hint"',
+    );
+  });
+
   it("renders ChatInputTextField with textarea utilities", () => {
     const html = renderToStaticMarkup(
       <ChatInputTextField

src/app/chat/components/chat-header.tsx

@@ -50,8 +50,13 @@ export function ChatHeader({
         offerBanner
       )}
 
-      {!isGuest ? (
-        <div className="grid grid-cols-[auto_minmax(0,1fr)_auto] items-center gap-(--spacing-sm,8px) px-(--spacing-md,12px) py-(--spacing-sm,8px)">
+      <div
+        className={
+          isGuest
+            ? "flex items-center px-(--spacing-md,12px) py-(--spacing-sm,8px)"
+            : "grid grid-cols-[auto_minmax(0,1fr)_auto] items-center gap-(--spacing-sm,8px) px-(--spacing-md,12px) py-(--spacing-sm,8px)"
+        }
+      >
         <BackButton
           href={characterRoutes.splash}
           variant="dark"
@@ -59,6 +64,8 @@ export function ChatHeader({
           analyticsKey="chat.back_to_home"
         />
 
+        {!isGuest ? (
+          <>
             <div className="flex min-w-0 justify-center">
               {showBrowserHint ? <BrowserHintOverlay /> : null}
             </div>
@@ -73,8 +80,9 @@ export function ChatHeader({
             >
               <Menu size={24} aria-hidden="true" />
             </button>
-        </div>
+          </>
         ) : null}
+      </div>
     </header>
   );
 }