Tier 5 refactor: molecule extraction, browser tests, project sub-nav #8

Job	Run time
wasm-pack test (headless Firefox)	2m 9s
cargo test	33s
Line endings (LF only)	14s
cargo fmt --check	12s
cargo clippy	38s
build	1m 56s
leptosfmt --check	11s
	5m 53s

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