Docked-but-collapsible placement (the chosen direction):
- A collapse toggle (chevron) in the chart header; state persists to
localStorage.
- Collapsed = a thin summary bar: a mini sage sparkline + distance and
ascent/descent + an expand toggle. Reclaims map space on demand.
- Summary figures come from the same authoritative routeStats the
sidebar uses (distance, elevationGain, elevationLoss), so the numbers
match the sidebar exactly — not recomputed from the raw elevation
points (which over-counted ascent ~2x from noise).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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