Assert the full History tooltip geometry

Update the prior fixed-height assertion for the taller wrapped-timestamp tooltip and verify its centre remains aligned with the selected sample.

Contract-Neutral: Test-only geometry expectation for the keyboard inspection contract already updated in the parent; no runtime or interface delta.
Change-source: pulse-maintainer

frontend-modern/src/components/shared/__tests__/HistoryChart.test.tsx

@@ -322,7 +322,8 @@ describe('HistoryChart', () => {
 
     expect(layout.x).toBe(162);
     expect(layout.x).toBeGreaterThan(150);
-    expect(layout.y).toBe(47);
+    expect(layout.height).toBe(64);
+    expect(layout.y + layout.height / 2).toBe(70);
   });
 
   it('moves the tooltip to the left edge side near the right chart boundary', () => {