feat(BT-003B): add event comparison drilldown

tests/test_e2e_playwright.py

@@ -196,12 +196,24 @@ def test_homepage_and_options_page_render() -> None:
         page.get_by_role("button", name="Run comparison").click()
         expect(page.locator("text=Ranked Results").first).to_be_visible(timeout=15000)
         expect(page.locator("text=Scenario Results").first).to_be_visible(timeout=15000)
+        expect(page.locator("text=Strategy Drilldown").first).to_be_visible(timeout=15000)
         expect(page.locator("text=Portfolio Value Paths").first).to_be_visible(timeout=15000)
+        expect(page.locator("text=Selected strategy: Protective Put ATM").first).to_be_visible(timeout=15000)
         rerun_event_text = page.locator("body").inner_text(timeout=15000)
         assert "Baseline series shows the unhedged collateral value path" in rerun_event_text
         assert "Templates compared" in rerun_event_text and "4" in rerun_event_text
+        assert "Worst LTV point" in rerun_event_text
+        assert "Margin threshold breach dates" in rerun_event_text
+        assert "Daily path details" in rerun_event_text
         assert "Historical scenario starts undercollateralized:" not in rerun_event_text
 
+        page.get_by_label("Strategy drilldown").click()
+        page.get_by_text("#4 — Protective Put 90%", exact=True).click()
+        expect(page.locator("text=Selected strategy: Protective Put 90%").first).to_be_visible(timeout=15000)
+        expect(page.locator("text=Rank #4 · Breached margin threshold").first).to_be_visible(timeout=15000)
+        expect(page.locator("text=2024-01-08 · 82.6%").first).to_be_visible(timeout=15000)
+        expect(page.locator("text=$17,939").first).to_be_visible(timeout=15000)
+
         page.get_by_label("Event preset").click()
         page.get_by_text("GLD January 2024 Drawdown", exact=True).click()
         expect(page.locator("text=Results out of date").first).to_be_visible(timeout=15000)