Improvements to the description box

[Rafee-M]

I love the new redesign. I feel like the description could have a few more features.

Bigger Description Box: It'd really helpful if the description box was bigger with support for multiple lines. It would allow to add detailed descriptions to Tasks and Categories

Suggested box implementation:

1. Giving the option to customise and show more than 1 line on the preview lines shown in todo list menu
2. The size of the popup shown on tapping a to-do could be increased or it could transition into a separate menu. Example from Doable

https://github.com/DarkMooNight/ToDark/assets/69535896/d1905bd0-eb99-4aa1-96a6-5bd5d2c12e27

Markdown Support: It'd be be really convenient if there was markdown support with some common options easily accessible.

Suggested markdown implementation:

1. Show common options such as bold, italic, highlighting on the long press menu (screenshot from Doable):

2. Show markdown options on a swipe-able bar:

https://github.com/DarkMooNight/ToDark/assets/69535896/62fd2d65-b1e1-4621-a7fc-8159eafb31eb