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/systemd/user/omarchy-crash-watch.service

@@ -5,6 +5,9 @@ Description=Announce process crashes and offer an AI diagnosis
 After=graphical-session.target
 PartOf=graphical-session.target
 ConditionEnvironment=WAYLAND_DISPLAY
+# Set by omarchy-toggle-crash-capture. Checked here so a disabled watcher stays
+# disabled across logins without the unit having to be disabled.
+ConditionPathExists=!%h/.local/state/omarchy/toggles/crash-capture-off
 
 [Service]
 Type=simple