Fix organization ID preservation during token refresh

[nicknisi]

Summary

• Fixes an issue where users were reverting to their default organization after token refresh
• Preserves the current organizationId when tokens are automatically refreshed

[greptile-apps]

PR Summary

Implements critical fix for organization context preservation during token refresh operations in src/session.ts and its corresponding test file.

• Added organization ID extraction and preservation logic in token refresh flow to prevent users from reverting to default organization
• Updated src/session.ts to pass through the current organizationId during refresh token authentication
• Added test coverage in src/session.spec.ts to verify organization context is maintained during token refresh

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