* new themes and theme type updates
* update theme processing
port newer functionality from webapp
* update theme UI
including new svg-based thumbnail
* lint fixes
* update snapshots and tests
* update theme tile border approach
* remove unused path component
* remove old variable typo
* remove old variable type from theme type
* lint and snapshot updates
* update snapshots
* Add linter rules for import order and type member delimiters
* Remove unneeded group
* Group all app/* imports before the internal imports
* Move app/ imports before parent imports
* Separate @node_modules imports into a different group
* Substitute app paths by aliases
* Fix @node_modules import order and add test related modules
* Add aliases for types and test, and group import types
* MM-21368 Notify user when editing message that's too long
* Disable 'Save' button to prevent edits from being posted
* Display error message specific to the message size and allows max, instead of the current, default "Invalid Message" error.
* Split message length error into text (left justified) and counts (right justified)
UX guidance from PR review
* UX Review: Wrap for longer error text + spacing adjustment
* UX Review: Align split messages to top + add spacing in-between
* UX Review: Align error message box padding with content
