Unify time tracking on server-backed entries with updateRunning.

Consolidates dashboard and invoice timers onto shared time-entry APIs so clock-in state, invoice linking, and clock-out flow stay consistent across surfaces.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/dashboard/page.tsx

@@ -490,7 +490,6 @@ function CardSkeleton() {
 }
 
 import { DashboardPageHeader } from "~/components/layout/page-header";
-import { ActiveTimerWidget } from "~/app/dashboard/_components/active-timer-widget";
 
 // ... imports
 
@@ -511,10 +510,6 @@ export default async function DashboardPage() {
         description="Here's what's happening with your business today"
       />
 
-      <HydrateClient>
-        <ActiveTimerWidget />
-      </HydrateClient>
-
       <HydrateClient>
         <Suspense fallback={<StatsSkeleton />}>
           <DashboardStats stats={stats} />