feat: add user-configurable search score threshold slider for semantic search (#5027) #10006

Job	Run time
knip	42s
check-translations	21s
platform-unit-test (ubuntu-latest)	2m 58s
platform-unit-test (windows-latest)	5m 45s
compile	2m 8s
check-openrouter-api-key	6s
integration-test	7m 45s
notify-slack-on-failure	0s
	19m 45s

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