Add authentication flow, gated on build time variable#131

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ellenjiang7 wants to merge 3 commits intomainfrom

Commits on Feb 3, 2026

Add build-time environment variable to specify application mode (public vs internal) for experimental features
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Commits on Feb 4, 2026

Add auth service for managing firebase authentication
ellenjiang7
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Add authentication user flow with login page and profile button, gated on internal flag
ellenjiang7
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