Nikketryhard
6a07786c4e
feat: implement headless LS authentication via state sync
Reverse-engineered the UnifiedStateSyncUpdate protocol:
- initial_state field is bytes (not string), contains serialized Topic proto
- Map key for OAuth is 'oauthTokenInfoSentinelKey'
- Row.value is base64-encoded OAuthTokenInfo protobuf
- OAuthTokenInfo includes access_token, token_type, expiry (Timestamp)
- Set far-future expiry (2099) to prevent token expiry errors
Also fixed:
- PushUnifiedStateSyncUpdate returns proper empty proto response
- Stream keep-alive avoids sending empty envelopes (LS rejects nil updates)
- uss-enterprisePreferences topic handled (empty initial state)