fix: add confirmation dialog and snapshot history before reset #85

[Abhishek-gupta18]

##What this PR does

• Added a confirmation dialog before "Reset All Fields" executes to prevent accidental data loss
• Automatically snapshots the full editor state (via localStorage) before every reset — so nothing is lost
• Maintains a rolling history of up to 10 timestamped snapshots, stored entirely in localStorage
• Introduced a History panel in the UI where users can browse past snapshots and restore any previous state with a single click
• Fully zero-dependency and browser-based, consistent
  with the existing localStorage architecture of the app

Issue

Closes #85

Testing

• Click Reset All Fields → confirmation dialog appears
• Confirm reset → snapshot saved in history
• Open History panel → snapshots visible with timestamps
• Click Restore → previous state recovered successfully

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