fix(browser): only fire browserFinished when the Custom Tab actually terminates #5772

Job	Run time
setup (macos-15)	30s
setup (ubuntu-latest)	21s
lint-scripts	21s
lint (browser)	29s
verify-android (browser)	2m 12s
verify-ios (/Applications/Xcode_26.0.app, browser)	2m 15s
verify-web (browser)	25s
	6m 33s

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