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>

README.md

@@ -72,8 +72,13 @@ Two design decisions worth calling out:
 **The menu is rebuilt from scratch in `menuNeedsUpdate(_:)`.** Menu bar apps
 accumulate bugs from trying to keep dozens of checkmarks in sync with model
 state. Throwing the menu away and regenerating it from `Preferences` and
-`WakeController` on each open makes desync structurally impossible, and a menu
-opens rarely enough that the cost is irrelevant.
+`WakeController` on each open prevents desync between openings, and a menu
+opens rarely enough that the cost is irrelevant. State can still change while
+the menu is open (a timed session expires, you plug in), so the few items whose
+meaning depends on it — the status line, the Turn On / Turn Off toggle and
+"Add 30 minutes" — are refreshed live, and the toggle carries the action it
+displays. A click never does the opposite of its label: if the toggle changed
+meaning just as you clicked, the click is ignored.
 
 **`SleepBlocker.apply(_:)` is declarative, not imperative.** You hand it the set
 of assertions you want held and it reconciles the delta. No `if held { release }`
@@ -82,14 +87,27 @@ branching at call sites, and repeated calls are free.
 ### Smart activation semantics
 
 The tricky part of conditional activation is not the conditions, it's not
-fighting the user. Wakeful tracks *why* it is on (`.manual` vs `.automatic`):
+fighting the user. Wakeful tracks *why* it is on (`.manual` vs `.automatic`),
+and which rules you have overridden:
 
 - A rule becoming true turns Wakeful on with source `.automatic`.
-- A rule becoming false turns it off again **only if** source is `.automatic`.
-  Your manual session is never cancelled by a rule.
-- Manually turning it **off** while a rule wants it on sets a suppression flag,
-  so the app doesn't immediately re-enable itself. The flag clears as soon as
-  the rule stops being satisfied — so unplugging and replugging re-arms it.
+- When the last rule you haven't overridden stops holding, it turns off again
+  **only if** source is `.automatic`. Your manual session is never cancelled by
+  a rule.
+- Manually turning it **off** while a rule wants it on overrides that rule, so
+  the app doesn't immediately re-enable itself. The status line names what is
+  paused (e.g. "Sleep allowed — AC rule paused"), and Turn On (and the global
+  shortcut) becomes **Resume Smart Activation**, which hands control back to the
+  rules. Only rules that hold at that moment are overridden; the others stay
+  armed. With the AC and battery rules both on, turning off at your desk and
+  then unplugging lets the battery rule switch Wakeful back on.
+- Each overridden rule re-arms on its own as soon as it stops being satisfied —
+  so unplugging and replugging re-arms the AC rule even while an external
+  display keeps another rule true. Enabling a rule arms it too.
+- Starting a manual session overrides the rules that hold at that moment. When
+  a timed session ends, a rule that held throughout stays overridden — so "Keep
+  Awake For 15 minutes" really ends, even on AC — but a rule that became true
+  during the session (you docked halfway through) takes over.
 
 ### Global shortcut
 
@@ -143,26 +161,35 @@ Preferences and Launch at Login only behave correctly from the assembled bundle.
 Click the cup icon in the menu bar.
 
 - **Turn On / Turn Off** — indefinite session. Same as the global shortcut.
+  While Smart Activation is paused this reads **Resume Smart Activation**.
 - **Keep Awake For** — 15m / 30m / 1h / 2h / 5h timed session, with a live
   countdown in the menu bar. Add 30 minutes to extend one in flight.
 - **Prevent** — pick which assertions to hold. At least one is always held.
 - **Smart Activation** — auto-enable while on AC, while an external display is
   connected, or while on battery above 20/50/80% (the battery rule only applies
-  *off* AC, otherwise a charged laptop would satisfy it forever). The submenu
-  footer shows current conditions so you can see why a rule fired.
-- **Global Shortcut** — off by default; pick a preset to enable it. If the
-  combination is already claimed by another app or a System Settings shortcut,
-  the menu says "unavailable" rather than silently doing nothing. Note that no
-  global shortcut fires while macOS Secure Input is active — i.e. while a
-  password field has focus.
+  *off* AC, otherwise a charged laptop would satisfy it forever). Any display
+  that isn't the built-in panel counts, so the rule also covers a closed laptop
+  driving a monitor, mirroring to a projector, and a desktop Mac's only monitor.
+  The submenu footer shows current conditions so you can see why a rule fired.
+- **Global Shortcut** — off by default; pick a preset to enable it. Presets that
+  clash with one of macOS's own system shortcuts (screenshots, Spotlight,
+  Mission Control, input sources and the like, in System Settings ▸ Keyboard ▸
+  Keyboard Shortcuts) are marked and can't be picked; the preset you've chosen
+  is checked when you pick it and at each launch. App Shortcuts, Services
+  shortcuts and other apps' shortcuts can't be detected: macOS lets several apps
+  register the same combination and delivers it to all of them, so if a preset
+  already does something elsewhere, pick a different one. No global shortcut
+  fires while macOS Secure Input is active — i.e. while a password field has
+  focus.
 - **Launch at Login** — install to `/Applications` *first*; the registration
   records the bundle path, so moving the app afterwards breaks it.
 - **Turn On at Launch** — combine with Launch at Login for always-awake.
 
 ### Hidden preference
 
-The toggle and the global shortcut start an indefinite session by default. To
-make them start a timed one instead:
+The toggle and the global shortcut start an indefinite session by default
+(while Smart Activation is paused they resume it instead). To make them start a
+timed one:
 
 ```sh
 defaults write com.github.wakeful.Wakeful defaultDurationMinutes -int 60