Feature/home screen

[tonelli-m]

Description

Implementing home screen following designs from Figma.

Currently only the header part with sound level meter is implemented, other sections will be added in later pull requests.

Changes

• Move sound level meter header from MeasurementScreen into a separate component so it can be reused
• AudioSource is now managed at coordinator level so it can be uninterrupted between the home and measurements screens
• Added a new NCButton class to manage button styling in a unified manner
• Settings are now accessible through a cogwheel icon in the upper right corner
• Updated noise level color ramp to use the palette from NoiseModeling (contrasts are not always great when using these colors on a white background so we might think about slightly adapting those colors)
• Did a bunch of cleanup and refactoring here and there

Linked issues

#62

Checklist

• Code compiles correctly on all platforms
• All pre-existing tests are passing
• If needed, new tests have been added
• Extended the README / documentation if necessary
• Added code has been documented