* Update compound and handle plain to tertiary/textLink button style updates.
* Update the start chat button to use the right icon/style.
* Update preview snapshots.
* Fix remaining snapshots.
* feat(crypto): Warn and block sending on verification violation
* fixup: Fix ComposerToolbar previews
* fixup! add ComposerToolBarViewModelTests for canSend
* add new preview tests for verification violations
* Use `deferFulfillment`s in the unit tests.
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Co-authored-by: Stefan Ceriu <stefanc@matrix.org>