feat: add folder watch

[codecov[bot]]

Codecov Report

Attention: 43 lines in your changes are missing coverage. Please review.

Comparison is base (1120723) 76.44% compared to head (6fc568e) 77.74%.

Files	Patch %	Lines
...gets/transcriber/file_transcription_form_widget.py	78.43%	11 Missing :warning:
buzz/widgets/main_window.py	70.96%	9 Missing :warning:
...ferences_dialog/folder_watch_preferences_widget.py	87.32%	9 Missing :warning:
...ferences_dialog/models/folder_watch_preferences.py	76.00%	6 Missing :warning:
buzz/widgets/menu_bar.py	71.42%	4 Missing :warning:
...z/widgets/preferences_dialog/models/preferences.py	81.25%	3 Missing :warning:
buzz/widgets/transcription_task_folder_watcher.py	97.29%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #655 +/- ## ========================================== + Coverage 76.44% 77.74% +1.29% ========================================== Files 56 62 +6 Lines 2963 3248 +285 ========================================== + Hits 2265 2525 +260 - Misses 698 723 +25 ``` | [Flag](https://app.codecov.io/gh/chidiwilliams/buzz/pull/655/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | Coverage Δ | | |---|---|---| | [Linux](https://app.codecov.io/gh/chidiwilliams/buzz/pull/655/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `75.61% <87.84%> (+1.40%)` | :arrow_up: | | [Windows](https://app.codecov.io/gh/chidiwilliams/buzz/pull/655/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `?` | | | [macOS](https://app.codecov.io/gh/chidiwilliams/buzz/pull/655/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams) | `76.23% <88.12%> (+1.44%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Chidi+Williams#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.