tests

Tweak repr of ChatMessage #12278

Job	Run time
Setup workflow	3s
Pixi lock	1m 12s
Run pre-commit	31s
type:test-type:ubuntu-latest	1m 21s
ui:test-ui:ubuntu-latest	15m 49s
core:test-core:ubuntu-latest	1m 49s
ui:test-ui:macos-latest	14m 43s
unit:test-310:ubuntu-latest	8m 12s
core:test-minimum:ubuntu-latest	1m 58s
ui:test-ui:windows-latest	28m 37s
unit:test-312:ubuntu-latest	8m 58s
unit:test-310:macos-latest	7m 59s
unit:test-312:macos-latest	8m 47s
unit:test-310:windows-latest	15m 24s
unit:test-312:windows-latest	17m 28s
result:test	1s
	2h 12m 52s

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