fix(calendar-sync): fix heading order, continuation lines, and exception text cleaningHEADmain

Three bugs found during manual verification of calendar sync output:

1. Heading/timestamp order reversed in event-to-org — nreverse pattern
   put timestamp before the org heading. Swap initial list order.

2. get-property continuation line regex broken — the ^ anchor in
   "^\n[ \t]" prevented matching at the correct position, truncating
   long DESCRIPTION values at the first ICS line fold. Remove anchor,
   add explicit position check (matching get-all-property-lines pattern).

3. collect-recurrence-exceptions didn't clean text — exception instances
   got raw ICS text (literal \n, HTML tags) replacing the cleaned base
   event text. Wrap summary/description/location in clean-text.

1 files changed, 5 insertions, 1 deletions

diff --git a/tests/test-calendar-sync--event-to-org.el b/tests/test-calendar-sync--event-to-org.el
index e6609e20..96ce49d5 100644
--- a/tests/test-calendar-sync--event-to-org.el
+++ b/tests/test-calendar-sync--event-to-org.el
@@ -26,7 +26,11 @@
                       :status "accepted"
                       :url "https://meet.google.com/abc-defg-hij")))
     (let ((result (calendar-sync--event-to-org event)))
-      (should (string-match-p "\\* Team Standup" result))
+      ;; Verify heading comes before timestamp
+      (should (string-match "\\* Team Standup" result))
+      (let ((heading-pos (match-beginning 0)))
+        (should (string-match "<[0-9]" result))
+        (should (< heading-pos (match-beginning 0))))
       (should (string-match-p ":PROPERTIES:" result))
       (should (string-match-p ":LOCATION: Conference Room A" result))
       (should (string-match-p ":ORGANIZER: John Smith" result))