Pull daily instead of on day 25; skip past dates and weekend misreads

The monthly day-25 pull pushed whatever month the district's permalink
served. September's PDF was still live on 9/29, so the 9/25 pull
re-pushed September and October would not have been pulled until 10/25.
Home Assistant now dedups lunch events per date, so pull every day and
pick up a new month the evening it's posted.

- push only today onward; skip weekend dates that have items (a misread
  date: Fri 9/25's menu once landed on Sat 9/26) and log a warning
- settings schema is just calendar_run_time; load_settings keeps only
  known keys and startup rewrites the file, dropping stale SMS-era data
- UI: remove day-of-month field and the "no dedup" warning, fix buttons
  that reverted to "This Week" labels
- docs: daily scheduler, HA queued mode + dedup, calendar is iCloud

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.env.example

@@ -12,13 +12,9 @@ HA_WEBHOOK_URL=
 ANTHROPIC_API_KEY=
 
 # --- Optional ---
-# Day of the month (1-28) to pull whichever month is currently published
-# and push it to the calendar. Re-pushing the same month creates duplicate
-# events, so pick one day near month-end (the district tends to post next
-# month's menu a few days early).
-CALENDAR_RUN_DAY_OF_MONTH=25
-
-# Time to run the pull (24-hour HH:MM, container timezone)
+# Time of the daily pull (24-hour HH:MM, container timezone). Each day it
+# pushes today onward from whichever month is published; Home Assistant
+# skips dates that already have a lunch event, so daily pulls are safe.
 CALENDAR_RUN_TIME=18:00
 
 # HTTP server port