Surface + waytype proportion bars on route detail, from the BRouter waytags the
Planner already computes (and currently discards on save). Design records the
data-source decision: persist a compact distance-weighted breakdown for
Planner-created routes (accurate, no external call); Overpass map-matching for
imports/uploads is parked as a future option.
Validates with `openspec validate --strict`. Specs only; no code.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
