fix: initialize jobs nav dot on every page load

Previously the dot only updated when visiting the Jobs page.
Now a jobs fetch runs at bootstrap so the dot reflects status
immediately on any page, including after a hard refresh.

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

js/app.js

@@ -53,4 +53,6 @@ if (VERSION) {
   document.getElementById('nav-version').textContent = label;
 }
 
+fetch('/api/jobs').then(r => r.json()).then(_updateJobsNavDot).catch(() => {});
+
 handleRoute();