feat(sessions): display and open Cloudflare URLs in session view

- Show Cloudflare URL in active session cards
- Change Open button to anchor tag linking directly to instance URL
- Add CSS styling for URL display in session cards
- Falls back to project navigation if no URL available

apps/web/src/styles.css

@@ -2555,6 +2555,21 @@ a.nav-item,
   font-size: 1rem;
 }
 
+.session-url {
+  margin: var(--space-1) 0;
+  font-size: 0.8rem;
+  word-break: break-all;
+}
+
+.session-url a {
+  color: var(--color-primary);
+  text-decoration: none;
+}
+
+.session-url a:hover {
+  text-decoration: underline;
+}
+
 .session-actions {
   display: flex;
   gap: var(--space-2);