Add Apple Watch app (TickTick-style) + midnight period notifications

WenzaWatch (new watchOS target, embed disabled until the watchOS platform is
installed — see project.yml note):
- Today list of actionable tasks (dated today/overdue + recurring occurrences),
  tap-to-complete with haptics, and add-via-dictation.
- Reads/writes the same tasks through the shared iCloud KV store that
  CloudSyncManager mirrors on the phone; watch entitlement uses the iOS app's
  kvstore identifier so they share one store. New tasks include all required
  TaskItem keys so the phone decodes them.
- NOTE: not compiled here (watchOS SDK absent on this machine); iOS build
  verified green with the embed commented out.

Period notifications: day/week/month/year now all fire at midnight (00:00),
adding the daily "One more day passed." (Pretty Progress style).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

WenzaWatch/WenzaWatch.entitlements

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.developer.ubiquity-kvstore-identifier</key>
+	<string>$(TeamIdentifierPrefix)com.kutesir.KisaniCal</string>
+</dict>
+</plist>