Update channel.model to import Channel from the local interface file
instead of the package namespace. This fixes an incorrect module
resolution and keeps the codebase consistent with local typings.
Add a new SidebarView union type ('CHANNELS' | 'PLAYLISTS') to expose
possible sidebar view options for consumers of the shared interfaces.
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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