Update default remote control port from 3000 to 8765 in settings
store and component initialization to avoid conflicts with common
development ports and align with the desktop/tauri environment.
Unhide and scope the remote control UI to desktop builds only:
- Restore the remote control block in settings template and guard it
with @if (isDesktop) so the checkbox and description render for
desktop users (previously commented out as not ported).
- Keep the remote control settings section conditionally visible
when the remoteControl form value is true.
These changes ensure desktop users can configure and enable the
remote control feature with a non-conflicting default port.
Add MPV_REUSE_INSTANCE key to the electron backend store service and
include mpvReuseInstance in the shared settings interface so the new
boolean setting is persisted and available across renderer and main
processes.
Also update English i18n JSON formatting and expand the HOME section
translations (reformatting and adding nested playlist-related keys)
to ensure the UI strings remain consistent after changes.
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