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-2026-07-30T13-31-32-227Z.yml

@@ -0,0 +1,22 @@
+- main [ref=f3e2]:
+  - generic [ref=f3e3]:
+    - generic [ref=f3e4]:
+      - link "Today" [ref=f3e6] [cursor=pointer]:
+        - /url: index.html
+      - group "Calendar view" [ref=f3e7]:
+        - button "Calendar" [ref=f3e8] [cursor=pointer]
+        - button "List" [pressed] [ref=f3e9] [cursor=pointer]
+    - generic [ref=f3e10]:
+      - link "Previous Month" [ref=f3e11] [cursor=pointer]:
+        - /url: index.html
+      - heading "August 2026" [level=2] [ref=f3e12]
+      - link "Next Month" [ref=f3e13] [cursor=pointer]:
+        - /url: august.html
+    - region "August 2026 list" [ref=f3e14]:
+      - heading "Events for August 2026" [level=3] [ref=f3e15]
+      - list [ref=f3e16]:
+        - listitem [ref=f3e17]:
+          - link "August Event August 1" [ref=f3e18] [cursor=pointer]:
+            - /url: "#"
+            - generic [ref=f3e19]: August Event
+            - time [ref=f3e20]: August 1