Release 1.1.0: fix display rule, shortcut clashes, stale menu and smart activation

- Detect an external display as any online display that isn't built in
  (CGGetOnlineDisplayList + CGDisplayIsBuiltin) instead of counting
  NSScreens, so the rule works in clamshell mode, when mirroring and on
  single-monitor desktops. The Smart Activation footer reports the same
  check.
- Refuse and mark shortcut presets that clash with a macOS system shortcut
  (CopySymbolicHotKeys, checked once, only when the Global Shortcut submenu
  opens), report the real reason a registration failed, and stop claiming
  that other apps' clashes are detected. Show the shortcut hint on the
  toggle only when it is actually registered.
- Make the menu toggle carry the action it displays, refresh the status
  line, toggle and "Add 30 minutes" while the menu is open, and ignore a
  click that lands as the toggle changes meaning, so a click never does the
  opposite of its label.
- Replace the single suppression flag with per-rule overrides: the status
  names what is paused, Turn On becomes Resume Smart Activation, each rule
  re-arms when it stops holding, and a rule that became true during a timed
  session takes over at expiry while rules that held throughout stay paused.
- Update the README to match, bump the version to 1.1.0 and add
  CHANGELOG.md.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Makefile

@@ -1,6 +1,6 @@
 APP_NAME   := Wakeful
 BUNDLE_ID  := com.github.wakeful.Wakeful
-VERSION    := 1.0.0
+VERSION    := 1.1.0
 
 # Override with: make SIGN_ID="Developer ID Application: Your Name (TEAMID)"
 SIGN_ID    ?= -