Fix Sign-In/Sign-Up Button Visibility, Hydration Delay & Cache Behaviour #319

Job	Run time
Security & Code Quality	1m 32s
Test Suite	44s
Build & Performance	4m 48s
Database Tests	1m 3s
Enhanced Security Testing	5m 9s
Deploy to Production	0s
Deploy to Staging	0s
Performance Monitoring	0s
Performance Monitoring (Staging)	0s
Rollback on Failure	0s
	13m 16s

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