* Don't rely on existence of --default-transition-* variables in transition utilities
* Update changelog
* Add test with no default transition values defined
* Inline value for --default-transition-timing-function
This is more consistent with how things worked in v3 and ensures things will still work if the user suppresses the output of all CSS variables.
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Co-authored-by: Adam Wathan <4323180+adamwathan@users.noreply.github.com>