Improve TXT export readability by using label:value format instead of raw JSON

[mulikruchi07]

Describe your improvement idea or feature request

Currently, exporting tasks as a .txt file outputs raw JSON data, which is difficult for users to read and understand.
This enhancement proposes formatting TXT exports in a human-readable label: value format while keeping JSON export unchanged.

How would you like to see it implemented?

1. Exported .txt files should display tasks in a readable format such as:
   • Description: Buy groceries
   • Status: pending
   • Due: 2025-01-01 10:00
   • Priority: L
   • Tags: home, shopping
2. JSON export should remain unchanged and continue to provide raw data.

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