[IMPROVEMENT] Package Bundle allow auto reopen and save

### Please confirm these before moving forward.

- [x] I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
- [x] This improvement refers to an existing feature. If you want to suggest a new feature, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=new-feature&projects=&template=feature-request.yml&title=%5BFEATURE+REQUEST%5D+%28Enter+your+description+here%29).
- [x] This improvement is not a bug. If you want to report a bug, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=bug&projects=&template=bug-issue.yml&title=%5BBUG%5D+%28Enter+your+description+here%29).

### Describe the improvement

Thank you for the efforts with UniGetUI, it is much appreciated and I am getting much use of UniGetUI during my system builds and the ongoing application/package updates.

I found that the Package Bundle lacks the functionality to remember and automatically open the last edited/opened file, and save/auto save file.

I wish it could remember and automatically open the last edited/opened package bundle, so I can directly add software to the bundle when searching for software to install.

I also needs a save feature, whether automatic or manual, so I don't have to create and save as new bundles every time, and then I can use file synchronization software to back up the bundle to the cloud.

### Describe how this improvement could help users

With these two features, users can now more conveniently track software changes on your computer, eliminating the need to repeatedly open Package Bundle, search for software, save the bundle as a new file, delete the old bundle file, and other tedious operations. You simply need to search, add, and the Package Bundle will automatically be saved. Then, the background synchronization software can automatically back it up to the cloud.