Add a toggle for crash capture (#6824)

Crash capture stays on by default, but Trigger > Toggle > Crash Capture (or
`omarchy toggle crash-capture`) now turns the watcher off. The toggle writes the
usual flag file and stops the unit for this session; the unit checks the same
flag with ConditionPathExists, so the choice survives a logout without the unit
having to be disabled.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

default/omarchy/omarchy-menu.jsonc

@@ -84,6 +84,7 @@
   "trigger.share.receive": {"icon":"󰥦","label":"Receive","action":"uwsm-app -- localsend"},
   "trigger.toggle.idle-lock": {"icon":"󰅶","label":"Stay Awake","action":"omarchy-toggle-idle"},
   "trigger.toggle.notifications": {"icon":"󰂛","label":"Notifications","action":"omarchy-toggle-notification-silencing"},
+  "trigger.toggle.crash-capture": {"icon":"󱚡","label":"Crash Capture","action":"omarchy-toggle-crash-capture"},
   "trigger.toggle.screensaver": {"icon":"󱄄","label":"Screensaver","action":"omarchy-toggle-screensaver"},
   "trigger.toggle.nightlight": {"icon":"󰔎","label":"Nightlight","action":"omarchy-toggle-nightlight"},
   "trigger.toggle.top-bar": {"icon":"󰍜","label":"Menu Bar","action":"omarchy-toggle-bar"},