Refactor and update various files for clarity and versioning

- LabSpectrumFileReader.cs: Modified regex in `Regex.Split` to split lines by whitespace or commas.
- Package.appxmanifest: Updated app version from `1.0.47.0` to `1.0.49.0`.
- LoginCheckViewModel.cs: Removed unnecessary `isTokenValidAsync` check.
- AlignmentHelper.cs:
  - Renamed parameters for clarity.
  - Replaced inline boundary checks with `belongsToSegment` method.
  - Updated methods to use new parameter names and method.
  - Renamed `getRightSegmentElementsXBoundaries` to `getRightSegmentBoundaries`.
  - Adjusted logic in `fixLeftSegment` and `fixRightSegment` to use inclusive range checks.
  - Updated method signatures for consistency.