feature: add undo history support for reset and template actions

[karthikeyakakarlapudi2007]

What I worked on

Implemented an undo feature to help users recover their previous data after applying a template or using the reset option.

Changes made

• Added undo history support using a history stack
• Added Ctrl + Z shortcut for undo
• Saved previous form state before:
  • applying templates
  • resetting all fields
• Restored the previous data safely without affecting normal typing

Why this improvement

Currently, users can lose all their entered content if they accidentally apply a template or click reset. This change adds a simple recovery mechanism and improves the overall editing experience.

Testing done

• Tested undo after applying different templates
• Tested undo after resetting all fields
• Verified the app works normally without errors

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[karthikeyakakarlapudi2007]

Hi, I’ve completed the implementation and tested the undo functionality for both template application and reset actions. Please let me know if any changes or improvements are needed. Thank you!