Chat2DB

Chat2DB Community 5.3.6 adds import preview and mapping, flexible CSV settings, MySQL transaction inspection, and execution-history filters, while improving table browsing, database compatibility, and desktop reliability.

## Added (4)

* CSV and Excel imports now offer data preview and column mapping on Web and Desktop, with field skipping and validation for duplicate mappings and missing required columns by @Aias00 and @openai0229 in [PR #2652](https://github.com/OtterMind/Chat2DB/pull/2652) and [PR #2887](https://github.com/OtterMind/Chat2DB/pull/2887).
* CSV imports support encoding, delimiter, text qualifier, and escape settings, header and data row ranges, empty-value handling, and date, time, and decimal formats by @Aias00 in [PR #2653](https://github.com/OtterMind/Chat2DB/pull/2653).
* MySQL 5.7 and 8.0 users can inspect active InnoDB transactions, duration, SQL, lock waits, and blocking connections, then open a console to inspect a related connection; unavailable metadata and insufficient privileges are explained explicitly by @Aias00 in [PR #2636](https://github.com/OtterMind/Chat2DB/pull/2636).
* Execution history can now be filtered by datasource, database, and schema,