release.2026-04-21T08-57-20Z.1513

## Bug Fixes

1. \[V2] Fixed bulk Undo timeout — Undo after clearing a large number
   of records no longer triggers 504 timeout, with streaming
   progress feedback added.
2. Fixed TEXTBEFORE function not working — No longer throws formula
   errors when extracting text before a delimiter.
3. Fixed incorrect blank() formula calculation — Return values now
   match expectations.
4. \[V2] Fixed date field not supporting search.
5. Fixed email search returning excessive file downloads — Searching
   specific emails for invoice attachments no longer returns a
   large number of unintended files.
6. Fixed App Builder preview incorrectly triggering Autofix cards —
   Hydration mismatch and other recoverable errors no longer trigger
   Autofix.
7. \[V2] Fixed legacy formula-on-lookup field conversion causing 500
   errors — Operations like updating formatting precision no longer
   unexpectedly clear field options or corrupt data.
8. Fixed AI field creation silently ignoring aiConfig — Validation
   and feedback improved to prevent misconfigured or missing
   aiConfig.
9. Fixed Sandbox environment using wrong timezone — Now correctly
   uses user-configured timezone (e.g. Asia/Shanghai) instead of
   UTC.

## New Features

1. Added TEXTSPLIT function — Split text by a specified delimiter
   and retrieve individual parts as needed.
2. Added CLI commands for local automation script editing — Download
   automation/script code to local files, edit and upload back
   without re-outputting the full script.

## Improvements

1. \[V2] Undo/Redo performance optimization — Reduced request latency
   with streaming progress feedback for bulk operations.
2. App Builder AI generation improvements — Introduced scaffold map
   to reduce redundant file exploration; generated pages now default
   to ISR to avoid rate limiting under high concurrency.