Show Popi.TV in the header brand

The app header still exposed the internal popiart-node label while the requested product brand is Popi.TV. This keeps the existing icon asset but makes it decorative so the visible header label is the accessible brand signal.

Constraint: Keep the change scoped to the top-left header logo area.

Rejected: Rename all popiart-node strings globally | the request only targeted the top-left Logo.

Confidence: high

Scope-risk: narrow

Directive: Do not broaden this into a product-wide rename without checking welcome and onboarding copy.

Tested: npm run test:run -- src/components/__tests__/Header.test.tsx

src/components/Header.tsx

@@ -251,9 +251,9 @@ export function Header() {
             className="flex items-center gap-2 hover:opacity-80 transition-opacity"
             title={t("header.openWelcome")}
           >
-            <img src="/banana_icon.png" alt="PopiArt" className="w-6 h-6" />
+            <img src="/banana_icon.png" alt="" aria-hidden="true" className="w-6 h-6" />
             <h1 className="text-xl font-semibold text-neutral-100 tracking-tight">
-              popiart-node
+              Popi.TV
             </h1>
           </button>
 

src/components/__tests__/Header.test.tsx

@@ -75,14 +75,16 @@ describe("Header", () => {
   describe("Basic Rendering", () => {
     it("should render the app title", () => {
       render(<Header />);
-      expect(screen.getByText("popiart-node")).toBeInTheDocument();
+      expect(screen.getByText("Popi.TV")).toBeInTheDocument();
     });
 
     it("should render the brand icon", () => {
-      render(<Header />);
-      const icon = screen.getByAltText("PopiArt");
+      const { container } = render(<Header />);
+      const icon = container.querySelector('img[src="/banana_icon.png"]');
       expect(icon).toBeInTheDocument();
       expect(icon).toHaveAttribute("src", "/banana_icon.png");
+      expect(icon).toHaveAttribute("alt", "");
+      expect(icon).toHaveAttribute("aria-hidden", "true");
     });
 
     it("should hide external author link", () => {