fix(tools): correct lightdom css routing, improve trailing slash behavior #10647

Job	Run time
Lint files	36s
Unit Tests (Web Test Runner)	1m 36s
Compile project (24)	53s
Verify that build runs on Windows	1m 26s
Compile project (22)	51s
SSR Tests (Playwright)	1m 9s
Publish Playwright Report	8s
Validate successful build on main	5s
	6m 44s

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