Telegram Login Dialog
++ Standalone extraction of the current login popup: same layout, same visual states, + same QR flow, but with reusable neutral endpoint names for moving into a separate repo. +
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+ Start QR session
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+ POST /userauth/qr/create
+ Returns a one-time token and Telegram deeplink for the QR image.
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+ Poll QR confirmation
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+ GET /userauth/qr/poll?token=...
+ Returns pending, confirmed, or expired. On confirmed, also returns the user session.
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+ Read current session
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+ GET /userauth/session
+ Cookie-based session lookup used for initial auth check and fallback polling.
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+ Sync cart after login
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+ POST /usersession/{sessionId}
+ Existing cart payload is preserved. Only the namespace is generalized for reuse.
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