Add event contact email and multi-day occurrences design specifications

- Introduced a new specification for adding an optional contact email field to events, including front-end output and compatibility testing.
- Added a comprehensive design document for multi-day event occurrences, detailing the new occurrence data model, validation, normalization, and calendar architecture.
- Created specifications for ACF field-key switching compatibility and local ACF override compatibility to ensure seamless integration with existing themes.
- Implemented a desktop calendar view toggle design, allowing users to switch between calendar and list views, with persistent preferences and responsive behavior.

.playwright-mcp/page-2026-07-30T13-31-10-209Z.yml

@@ -0,0 +1,31 @@
+- main [ref=f1e2]:
+  - generic [ref=f1e3]:
+    - generic [ref=f1e4]:
+      - link "Today" [ref=f1e6] [cursor=pointer]:
+        - /url: index.html
+      - group "Calendar view" [ref=f1e7]:
+        - button "Calendar" [ref=f1e8] [cursor=pointer]
+        - button "List" [active] [pressed] [ref=f1e9] [cursor=pointer]
+    - generic [ref=f1e10]:
+      - link "Previous Month" [ref=f1e11] [cursor=pointer]:
+        - /url: index.html
+      - heading "July 2026" [level=2] [ref=f1e12]
+      - link "Next Month" [ref=f1e13] [cursor=pointer]:
+        - /url: august.html
+    - region "July 2026 list" [ref=f1e33]:
+      - heading "Events for July 2026" [level=3] [ref=f1e34]
+      - list [ref=f1e35]:
+        - listitem [ref=f1e36]:
+          - link "July Event July 16" [ref=f1e37] [cursor=pointer]:
+            - /url: "#"
+            - generic [ref=f1e38]: July Event
+            - time [ref=f1e39]: July 16
+  - generic [ref=f1e21]:
+    - generic [ref=f1e22]:
+      - link "Today" [ref=f1e24] [cursor=pointer]:
+        - /url: index.html
+      - group "Calendar view" [ref=f1e25]:
+        - button "Calendar" [ref=f1e26] [cursor=pointer]
+        - button "List" [pressed] [ref=f1e27] [cursor=pointer]
+    - region "Second list" [ref=f1e40]:
+      - heading "Second calendar list" [level=3] [ref=f1e41]