fix: keep tape date visible and finish dual-review shell polish

Give the overview date its own class so mobile cannot hide it, keep mentor
subtitles fully readable, and align sentiment table header tokens.

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

tests/e2e/app-shell.spec.js

@@ -3201,6 +3201,8 @@ test("merged header keeps date, detail fields and 13 pool columns after dual-rev
   await expect(page.locator("#tapeLimitDown")).toBeVisible();
   await expect(page.locator("#detailBroken")).toBeVisible();
   await expect(page.locator("#dataDateMetric")).toBeVisible();
+  await expect(page.locator(".tape-detail-date")).toBeVisible();
+  expect(await page.locator("#dataDateMetric").evaluate((node) => Boolean(node.closest(".metric-wide")))).toBe(false);
   await page.keyboard.press("Escape");
 
   await page.setViewportSize({ width: 1600, height: 1000 });