Feature/settings

[Romasav]

Summary

• Implemented a new settings feature, allowing users to update and save band pass filter settings (High Cut Off and Low Cut Off).

Changes

• Added a dialog interface for updating band pass filter settings (High Cut Off and Low Cut Off).
• Implemented real-time input validation to ensure only valid numeric values are accepted.
• Integrated error handling to provide immediate feedback for invalid inputs.
• Used SharedPreferencesAsync to store settings on device.

Testing

• Verified that entering valid and invalid values in the settings dialog updates the settings as expected.
• Checked that settings persist across app restarts.
• Confirmed that error messages appear for invalid input and disappear when corrected.