Proxmity/ Signal Source Finder Module

### Prerequisites

- [x] I have read [CONTRIBUTING.md](https://github.com/EFForg/rayhunter/blob/main/CONTRIBUTING.md)

### What problem does this feature solve or what does it enhance?

Currently there is no way to act upon an incident. Assume we are somewhere on a protest; an IMSI catcher is present: the bar on the router turns red/ ntfy pushes a notification. What now? We don't know where and who was that? Was is that sus van? Or is it the big guy with a backpack?

Apart from the missing geotagging of incidents, we are not able to find and collect further information on the signal source.

### Proposed Solution

Signal-strength based proxmity indicator.

The dashboard could allow us to turn on the feature: once an incident happen: switch to a "finder" mode and lock in on the source. The bar on the top of the display or an alternative UI could navigate us towards the source based on signal strength.

In a perfect world multiple devices could mesh or chain together and triangulate properly.

But for now a rudimentary indicator would already be amazing and could help greatly in discovering the actual source of the signal which could lead to better attribution.

### Alternatives Considered

Leave it as is.