Drop western default apps from the CN default set

Basecamp, Discord, HEY, Google Contacts/Maps/Messages/Photos,
WhatsApp, and X lose their shipped launchers, webapp keybindings,
and the whatsapp-slim extension; aether, libreoffice-fresh, and
obs-studio leave the base package set. The HEY mailto handler and
its registration go with them. Preinstall add/remove lists, the
launcher hide list, and chromium flags stay in sync.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QKxGW1raAWaqeU8WdHsMsp

bin/omarchy-provision-user

@@ -11,7 +11,7 @@ Usage: omarchy finalize user [--force] [--first-install]
 
 Runs the per-user setup steps that /etc/skel can't seed:
 dev-aware skill symlinks, xdg-user-dirs + gtk bookmarks (need \$HOME),
-default browser/mailto, and install/user/all.sh.
+default browser, and install/user/all.sh.
 
 For shipped configs see /etc/skel (new users) and omarchy-reinstall-configs
 (existing users explicitly resyncing).
@@ -110,7 +110,6 @@ source "$OMARCHY_INSTALL/user/all.sh"
 
 omarchy-refresh-applications
 env -u BROWSER xdg-settings set default-web-browser chromium.desktop
-xdg-mime default HEY.desktop x-scheme-handler/mailto
 
 if (( first_install )); then
   mkdir -p "$state_dir/migrations"