chore: clean up unused imports and variables #311

Job	Run time
Security Audit	2m 45s
Unit Tests	40s
Lint	37s
Check (x86_64-unknown-linux-gnu, no-default)	2m 43s
Check (armv7-unknown-linux-gnueabihf, no-default)	3m 54s
Check (aarch64-unknown-linux-gnu, no-default)	4m 8s
Check (x86_64-unknown-linux-gnu, default)	2m 52s
Check (aarch64-unknown-linux-gnu, web-tools)	3m 58s
Check (x86_64-pc-windows-msvc, default)	11m 41s
Check (x86_64-apple-darwin, default)	3m 44s
Check (aarch64-apple-darwin, default)	2m 29s
Check (x86_64-pc-windows-msvc, no-default)	11m 33s
Check (x86_64-unknown-linux-gnu, full)	3m 45s
Integration Tests	0s
E2E Tests	0s
Build (${{ matrix.target }})	0s
	54m 49s

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