Rounds out the multi-select bottom bar (README §3.6) with 转发/收藏 alongside
the existing 删除 -- reuses the single-message ForwardPickerModal/
favoriteMessages/forwardMessage machinery from the context-menu actions,
just applied to the whole selected set. One "转发" button (not separate
逐条/合并 buttons) matching the old app's real dialog-internal mode toggle,
which this app's simplified single-target picker doesn't model -- already
noted as a scope cut in ForwardPickerModal's own docstring.
Verified live: entering multi-select via a message's context menu shows
转发/收藏/删除, and bulk-favorite POSTs a real /v1/im/favorites/batch request.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
