Add direct maps navigation from Earthlight project addresses

[aultra]

Description

Launch map applications directly from project addresses for faster field crew navigation.

Features

• Platform-specific maps launch (Android: Google Maps, iOS: Apple Maps, Web: browser)
• User preferences for preferred map app (Google Maps, Apple Maps, Waze)
• UI: Map icon button next to copy icon on address
• Context menu options (copy, open in maps, open in browser)

Implementation

Uses url_launcher package. URL-encode address and launch platform-appropriate maps URL.

Current Workaround

Users can click address to copy to clipboard, then manually paste into maps app.