Add Beta badge to Routines page and sidebar nav

Adds an amber "Beta" tag next to "Routines" in both the page heading
and the sidebar navigation item. Extends SidebarNavItem with textBadge
and textBadgeTone props for reusable text badges.

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

ui/src/pages/Routines.tsx

@@ -229,7 +229,10 @@ export function Routines() {
     <div className="space-y-6">
       <div className="flex flex-col gap-3 sm:flex-row sm:items-end sm:justify-between">
         <div className="space-y-1">
-          <h1 className="text-2xl font-semibold tracking-tight">Routines</h1>
+          <h1 className="text-2xl font-semibold tracking-tight flex items-center gap-2">
+            Routines
+            <span className="rounded-full bg-amber-100 px-2 py-0.5 text-xs font-medium text-amber-800 dark:bg-amber-900/30 dark:text-amber-400">Beta</span>
+          </h1>
           <p className="text-sm text-muted-foreground">
             Recurring work definitions that materialize into auditable execution issues.
           </p>