feat: export Week Ahead as calendar blocks (Closes #1198)

tests/e2e/test_mobile_week_ahead_release.py

@@ -102,6 +102,20 @@ def test_release_artifact_plans_seven_touch_safe_mobile_dates(
             bounds = confirm.bounding_box()
             assert bounds and bounds["height"] >= 44
             confirm.click()
+            expect(page.locator("#week-calendar-handoff")).to_be_visible()
+            expect(page.locator("#week-review")).to_be_hidden()
+            start = page.locator("[data-week-calendar-start]").first
+            expect(start).to_have_value("09:00")
+            expect(page.locator('[data-week-calendar-preview="issue:acme/mobile:41:"]')).to_have_text("09:00–09:30 · 30 min")
+            for control in (start, page.locator("#back-to-week-review-from-calendar"), page.locator("#share-week-calendar")):
+                bounds = control.bounding_box()
+                assert bounds and bounds["height"] >= 44
+            page.locator("#back-to-week-review-from-calendar").click()
+            expect(page.locator("#week-review")).to_be_visible()
+            confirm.click()
+            with page.expect_download() as download_info:
+                page.locator("#share-week-calendar").click()
+            assert download_info.value.suggested_filename.startswith("stackchain-week-ahead-")
             expect(page.locator("#plan-today-sheet")).to_be_hidden()
             page.wait_for_function("() => document.querySelector('#mobile-week-summary').textContent !== 'Loading Week Ahead…'")
             assert saved and len(saved[-1]["days"]) == 3