Add opt-in theme sync to herdr machines (#13430)

* Add a theme-set sample hook that mirrors themes to herdr machines

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Mirror theme changes to herdr machines by default

Replaces the sample hook with omarchy-theme-sync, which omarchy-theme-set
starts detached after every theme change, and a theme-sync-off toggle that
stops a machine from both sending and receiving.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Rename omarchy-theme-sync to omarchy-theme-set-herdr-machines

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Label the toggle Herdr Theme Sync and extract its menu guard

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Answer the Herdr Theme Sync menu guard from omarchy-theme-set-herdr-machines

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Sync herdr machines one at a time and drop the dry run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Check the theme sync toggle under the lock and stop special-casing this machine

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Make herdr theme sync opt-in

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

bin/omarchy-toggle-theme-sync

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# omarchy:summary=Toggle mirroring theme changes to and from your herdr machines
+
+omarchy-toggle herdr-theme-sync
+
+if omarchy-toggle-enabled herdr-theme-sync; then
+  omarchy-notification-send -g 󰸌 "Herdr theme sync enabled"
+else
+  omarchy-notification-send -g 󰸌 "Herdr theme sync disabled"
+fi