fix live leaderbord details

tests/runtime_persistence.test.js

@@ -5,6 +5,7 @@ import {
   applyPersistedStateHelper,
   hydrateFromBackendHelper,
   syncStateToBackendHelper,
+  tickClockHelper,
 } from "../src/runtime_services.js";
 
 function withMockFetch(mock, callback) {
@@ -284,3 +285,29 @@ test("failed state sync leaves version and dirty state unchanged", async () => {
   assert.equal(backend.available, false);
   assert.equal(backend.lastError, "error.sync_failed:connection refused");
 });
+
+test("running timing clock updates without rebuilding the leaderboard details modal", () => {
+  let renders = 0;
+  let dynamicRefreshes = 0;
+  let headerRefreshes = 0;
+  const base = {
+    dom: { clock: { textContent: "" } },
+    currentLanguage: () => "sv",
+    getActiveSession: () => ({ status: "running" }),
+    getCurrentView: () => "timing",
+    getOverlayMode: () => false,
+    renderView: () => { renders += 1; },
+    refreshTimingDynamics: () => { dynamicRefreshes += 1; },
+    updateHeaderState: () => { headerRefreshes += 1; },
+  };
+
+  tickClockHelper({ ...base, handleSessionTimerTick: () => ({ changed: false }) });
+  assert.equal(dynamicRefreshes, 1);
+  assert.equal(renders, 0);
+  assert.equal(headerRefreshes, 0);
+
+  tickClockHelper({ ...base, handleSessionTimerTick: () => ({ changed: true }) });
+  assert.equal(dynamicRefreshes, 1);
+  assert.equal(renders, 1);
+  assert.equal(headerRefreshes, 1);
+});