evykassirer f1c6fc13e7 compose: Migrate generic error to use shared banner template. ...

Error banners were rendered in a different place than warnings.
Now compose errors and warnings share the same template and styling
in compose_banner.hbs

Testing notes:
* I removed test_message_overflow since it seemed not to test
  anything that test_check_overflow_text wasn't already testing.
* private_message_recipient() can't be called to set emails to non-valid
  emails, so `invalid_recipient` cannot be tested (and is likely very
  difficult to trigger in production, if possible at all).

2022-12-06 15:43:33 -08:00

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