* Add proper CSP policy for HTML email preview
* Handle safe types centrally
* Precompile schema validation function to get rid of ajv2020
* Fix tests
* adjust more tests
* Allow ticket QR code colour to be configured
This commit introduces a feature enabling users to customise the QR
code colour in the ticket editor.
* Remove redundant argument from `Dict.get` call
Co-authored-by: Raphael Michel <mail@raphaelmichel.de>
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Co-authored-by: Raphael Michel <mail@raphaelmichel.de>