[Feature Request]: Purple Base theme

### Guidelines

- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the feature request I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.
- [X] This issue contains only one feature request.

### Problem Description

Is it possible to add a Purple colored base theme? There is already 2 variants of Pink available so why not add a Purple one as well. Maybe a Endeavour OS style purple variant.

### Proposed Solution


Hex: #1f1430
RGB: [31, 20, 48]

Hex: #321f50
RGB: [50, 31, 80]

Accent color:
Hex: #865ef3
RGB: [134, 94, 243]

### Alternatives Considered

Ligher version:

Hex: #352458
RGB: [53, 36, 88]

Hex :#31224b
RGB: [49, 34, 75]

Accent color:
Hex: #865ef3
RGB: [134, 94, 243]
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Additional variant:

Hex: #251941
RGB: [37, 25, 65]

Hex: #372756
RGB: [55, 39, 86]

Accent color:
Hex: #865ef3
RGB: [134, 94, 243]

### Issue Labels

new feature, new optional setting, visual improvement

### Additional Information

_No response_