release.2026-10-02T04-02-20Z.3278

## Feature Updates
- iOS sign-in now requires an existing Teable account and a server version that supports browser-based mobile authentication. Account creation through the iOS sign-in flow and sign-in to older, unsupported servers are no longer available.
- The mobile app now requests AI data-processing consent before sign-in, with consent applying separately to each server. Users are prompted on launch if they have not accepted the current consent version; declining signs them out.

## Bug Fixes & Improvements
- Fixed conditional lookups returning unrelated records when matching fields are empty, and improved comparison consistency between single-value and multi-value fields. Results may change for filters that previously relied on empty values matching each other.