Improve handling folder-mounts in windows

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/cryptomator/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/cryptomator/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

current procedure to handle folder-mount is mesh.

### What software is involved?

- Operating System: Win11
- Cryptomator: 1.7.5

### Volume Type

WinFsp (Local Drive)

### Steps to Reproduce

1. Mount vault to folder

### Expected Behavior

- `Cryptomator` should allow user mount to some folder without the folder exist.
- `Cryptomator` should create that folder if folder not exist.
- when PC was force shutdown or crash it make auto mount fail because folder not exist.
- `Cryptomator` should stop create `.~$MOUNTFOLDER` it's mesh when you have multiple vault (on show hidden folder system). just check and alert to user if folder was exist and not empty.
.
All of this will fix auto-mount fail after system crash. and it is a better way to handle folder-mount.

### Actual Behavior

- create multiple `.~$MOUNTFOLDER` so mesh.

### Reproducibility

Always

### Relevant Log Output

_No response_

### Anything else?

_No response_