[Condense] Show indicator message when context is condensing (#3765) #7535

Job	Run time
knip	57s
check-translations	53s
check-openrouter-api-key	1s
compile	1m 28s
test-extension (ubuntu-latest)	2m 49s
test-extension (windows-latest)	3m 37s
test-webview (ubuntu-latest)	59s
test-webview (windows-latest)	1m 58s
integration-test	1m 50s
unit-test	1s
	14m 33s

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