feat(web-demo): add login flow and rework PasskeyDemo UI #2514

Job	Run time
Generate merge base API spec	6m 51s
Generate head API spec	6m 29s
Check specs identical	7s
Generate vacuum reports for API spec	-1s
Check breaking changes	-1s
API Spec Check	4s
Linter Override	0s
	13m 29s

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