Mocks the Open-Meteo geocoding endpoint via page.route() so the suite is
hermetic. Covers the panel's closed-by-default state, search happy path,
Paris/Texas disambiguation ranking, no-match/network-failure/in-flight
states, XSS-safe rendering, map canvas singleton behavior, drag sync, the
mismatch flag, the maplibre-gl lazy-load boundary, and a full submit
round-tripping lat/lng into the entry's frontmatter.
