UI improvements import txt

[rogercgui]

This PR updates the screen displaying the TXT data migration process.

In this update:

• PHP calculates the total number of records migrated and calculates the percentage to display the progress;
• Improves memory management to prevent the browser from crashing during imports with more than 1,000 rows;
• Improves the display of records, showing the raw record for a more comprehensive analysis by the database administrator.