feat(ui): jobs view stub + sidebar entry

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

public/router.js

@@ -19,6 +19,7 @@ const ROUTES = [
   { name: 'search',   re: /^\/search$/,            keys: [] },
   { name: 'inbox',    re: /^\/inbox$/,             keys: [] },
   { name: 'sacred-valley', re: /^\/sacred-valley$/, keys: [] },
+  { name: 'jobs', re: /^\/jobs$/, keys: [] },
   { name: 'home',     re: /^\/?$/,                 keys: [] }
 ];