Routes

[bkeepers]

Create multi-leg routes by placing waypoints on the chart, then navigate along a route with bearing, distance, and next waypoint info.

Features:

• Create a route — Tap waypoints on the chart to build an ordered sequence of legs
• Edit a route — Insert, remove, reorder, and reposition waypoints; rename the route
• Map display — Route line rendered on the chart with numbered waypoint markers
• Route navigation — Active guidance: bearing/distance to next waypoint, ETA, leg progress
• Manage — List, rename, and delete saved routes
• GPX export — Export routes as <rte> elements for interoperability

Fixes #16 #17

[github-actions]

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[bkeepers]

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