The home map was drawing an initial addJourneyLine, then trying to remove
layer 'home-journey' in the Promise.all callback — but addJourneyLine names
the layer 'home-journey-line', so removeLayer was a no-op and removeSource
failed (layer still referencing the source), leaving a ghost line on top of
the GPX tracks.
Extract the Promise.all → GPX tracks → buildJourneySegments → addJourneySegments
pattern into MapUtils.renderGpxJourney() and replace both map.html.twig and
home.html.twig with the shared call. No upfront journey line is drawn — the
function handles the no-GPX case correctly via Promise.all([]).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr
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