fix: guard popover resize observer target #259

Job	Run time
release	15s
build (ubuntu-24.04, x86_64-unknown-linux-gnu)	5m 34s
build (windows-latest, x86_64-pc-windows-msvc)	6m 6s
build (macos-latest, aarch64-apple-darwin)	8m 24s
build (macos-latest, x86_64-apple-darwin)	4m 15s
	24m 34s

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