fix(view-browser): actually elevate header above main for dropdown overlay #138

Job	Run time
Build Images (scanner-opengrep, docker/Dockerfile.opengrep)	22s
Build Images (cli, docker/Dockerfile.cli)	59s
Build Images (scanner-supply-chain, docker/Dockerfile.supply-chain)	16s
Build Images (scanner-bandit, docker/Dockerfile.bandit)	20s
Test Argus CLI	1m 30s
Scan scanner-supply-chain	1m 28s
Scan scanner-opengrep	1m 40s
Scan cli	2m 18s
Scan scanner-bandit	1m 34s
Container Scan Summary	9s
	10m 36s

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