Bug fixes and performance improvements

[SuhasDissa]

This PR contains some Bug fixes and performance improvements related to the Recording Items Screen

Bug Fixes

• Fixed a bug that caused the app to crash when clicking on delete all recordings button.[^1]
• Fixed the broken sort menu.[^2]

Performance Improvements

• Increase the performance of file sort.
• Increase the performance of file delete. [^3]

Other Changes

• Moved the file handling logic into a separate FileRepository. So the overall code looks cleaner and easy to maintain.
• Added the "Default" option to sorting menu for unsorted list.

[^1]: This bug exists in the latest release. Occurs when there are more than 5(approx.) recording items. [^2]: This bug exists in the latest release. Sorting the items by size doesn't seem do anything. [^3]: Fixed the UI freezing when deleting files

[Bnyro]

Only some minor suggestions, looks great in general! Thanks! <3

[Bnyro]

Thank you! <3