Feature request: include a `geo:` URI in shared location text

**Summary**

When sharing a point/location from Locus Map ("Share" → We blink), the share currently contains only the Locus deep link. Please also append a standard `geo:` URI (RFC 5870) to the shared text, the way Organic Maps and OsmAnd do.

**Why**

The `geo:` URI is the only **app-agnostic** way to convey coordinates in a plain-text share. Receiving apps that don't know about Locus's URL format can still parse a `geo:` line out of the text and navigate to the point. Right now anything other than Locus itself gets only an opaque link.

**Suggested behavior**

Share text becomes something like:

```

<Point name>

<existing Locus URL>

geo:48.142345,17.100432?z=14

```

(One `geo:` line, lat/lon as decimal degrees, optional `?z=<zoom>`.)

**Precedent**

- Organic Maps – includes `geo:` alongside its `omaps.app/...` short link.

- OsmAnd – same pattern.

- KDE Itinerary, GNOME Maps and other Linux apps also rely on `geo:` for cross-app interoperability.

**Impact**

Zero risk – existing Locus users / Locus-aware integrations keep working unchanged. New benefit: every map app (OsmAnd, Organic Maps, OpenStreetMap.org, Freemap.sk, custom PWAs, etc.) can receive Locus location shares and open the right spot.