brand: add (you)r* prefix to landing page title

Reinforces the r-suite "your tools" philosophy across all rApp landing pages.
Also normalizes title separators to em-dash for consistency.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/layout.tsx

@@ -7,7 +7,7 @@ const inter = Inter({ subsets: ['latin'], variable: '--font-inter' })
 const jetbrainsMono = JetBrains_Mono({ subsets: ['latin'], variable: '--font-mono' })
 
 export const metadata: Metadata = {
-  title: 'rCal | Relational Calendar',
+  title: '(you)rCal — Relational Calendar',
   description: 'Spatiotemporal calendar with lunar overlay and multi-granularity navigation',
   icons: {
     icon: "data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>📅</text></svg>",