feat: export saved Week Ahead from overview (Closes #1260)

tests/e2e/test_mobile_week_ahead_release.py

@@ -105,10 +105,11 @@ def test_release_artifact_plans_seven_touch_safe_mobile_dates(
             expect(cards).to_have_count(7)
             expect(cards.first).to_contain_text("Next up")
             expect(cards.first).to_contain_text("Ship mobile capture")
-            expect(page.locator("#week-review-status")).to_have_text(
-                "Week Ahead overview · no changes made."
-            )
+            expect(page.locator("#week-review-status")).to_contain_text("30 min over capacity")
             expect(page.locator("#confirm-week-plan")).to_be_hidden()
+            blocked_export = page.locator("#export-saved-week-calendar")
+            expect(blocked_export).to_be_visible()
+            expect(blocked_export).to_be_disabled()
             availability = page.locator("#open-week-availability")
             expect(availability).to_be_visible()
             availability_bounds = availability.bounding_box()
@@ -192,6 +193,22 @@ def test_release_artifact_plans_seven_touch_safe_mobile_dates(
             expect(overview).to_be_visible()
             expect(planned_item).to_be_focused()
             assert len(saved) == writes_before_reflow + 1, "opening and inspecting Week Ahead must not add a write"
+            export_saved = page.locator("#export-saved-week-calendar")
+            expect(export_saved).to_be_visible()
+            expect(export_saved).to_be_enabled()
+            export_bounds = export_saved.bounding_box()
+            assert export_bounds and export_bounds["height"] >= 44
+            writes_before_export = len(saved)
+            export_saved.click()
+            expect(page.locator("#week-calendar-handoff")).to_be_visible()
+            expect(overview).to_be_hidden()
+            expect(page.locator('[data-week-calendar-preview="issue:acme/mobile:41:"]')).to_have_text(
+                "09:00–09:45 · 45 min"
+            )
+            assert len(saved) == writes_before_export, "exporting a saved week must not add a write"
+            page.locator("#back-to-week-review-from-calendar").click()
+            expect(overview).to_be_visible()
+            expect(export_saved).to_be_focused()
             for control in (cards.first.locator("[data-week-edit-day]"), edit_week):
                 bounds = control.bounding_box()
                 assert bounds and bounds["height"] >= 44