fix: restore signs after navigation

tests/browser/journey-integration.spec.ts

@@ -163,6 +163,36 @@ test('suppresses roadside signs for explicit navigation and history restoration'
   expect((await readSceneInstrumentation(page)).routeLabelsDrawn).toEqual([]);
 });
 
+test('restores the next sign after a navigator round trip', async ({
+  page,
+  distUrl,
+}) => {
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+  await expect(page.locator('.journey-world')).toHaveAttribute('data-scene-state', 'running');
+
+  await clickNavigationLink(page, '#profile');
+  await expect(page.locator('#profile-heading')).toBeFocused();
+  await clickNavigationLink(page, '#start');
+  await expect(page.locator('#start-heading')).toBeFocused();
+
+  const destination = await page.evaluate(() => {
+    const profile = document.getElementById('profile-heading');
+    if (!(profile instanceof HTMLElement)) throw new Error('Missing profile heading');
+    const viewportHeight = window.visualViewport?.height ?? window.innerHeight;
+    return Math.max(
+      1,
+      profile.getBoundingClientRect().top + window.scrollY
+        - viewportHeight * (0.35 + 0.45),
+    );
+  });
+  await page.mouse.wheel(0, 1);
+  await page.evaluate((scrollY) => window.scrollTo(0, scrollY), destination);
+
+  await expect.poll(async () => (
+    await readSceneInstrumentation(page)
+  ).signFrames.some((frame) => frame.targetId === 'profile')).toBe(true);
+});
+
 test('reconciles an idle rapid jump to the latest active route without flashing intermediates', async ({
   page,
   distUrl,

tests/unit/sign-controller.test.ts

@@ -458,4 +458,30 @@ describe('clock-driven sign lifecycle', () => {
       candidateId: 'experience',
     }))).toBeNull();
   });
+
+  it('starts a fresh passive sign traversal after explicit navigation', () => {
+    const controller = createSignController();
+    controller.sample(sample());
+    controller.sample(sample({ now: 1_200, direction: 0, deltaY: 0 }));
+    controller.sample(sample({ now: 2_600, direction: 0, deltaY: 0 }));
+    controller.sample(sample({ now: 3_300, direction: 0, deltaY: 0 }));
+
+    expect(controller.sample(sample({
+      now: 3_400,
+      source: 'explicit-navigation',
+      activeSectionId: 'contact',
+      candidateId: null,
+      candidateDistanceVh: null,
+    }))).toBeNull();
+    expect(controller.sample(sample({
+      now: 3_500,
+      source: 'explicit-navigation',
+      activeSectionId: 'start',
+    }))).toBeNull();
+
+    expect(controller.sample(sample({ now: 3_600 }))).toMatchObject({
+      targetId: 'profile',
+      phase: 'anticipate',
+    });
+  });
 });