Feat: Add MultiSelect component

[danditomaso]

• Created reusable MultiSelect checkbox component
  
  

• Created custom hook to manage position flag state (usePositionFlags)

• Internal flag state management with computed activeFlags

• Type-safe flag manipulation (toggleFlag, setFlag, setFlags)

Fixes #305

[Hunter275]

Is there somewhere that explains what these mean?

[danditomaso]

Is there somewhere that explains what these mean?

That's a good point. There is this on the Meshtastic website (https://meshtastic.org/docs/configuration/radio/position/#position-flags) which does a decent job explaining it. Do you think we should add an info icon or the hyperlink into the description?

[Hunter275]

@danditomaso a link to that page would work or a dialog in case no Internet

[danditomaso]

@Hunter275 Still planning on adding a dialog to provide contextual help, but I looked at Android and IOS and found neither app provides further help on what these flags mean, should we raise that to those teams to add in order to have parity between apps?