PTHSonde v1.4.3 — Geopotential altitude + shared time-series axis

Dashboard update.

Geopotential altitude (GPS-anchored)

Altitude is now computed the way meteorological radiosondes do: hypsometric integration of the sonde's own measured (virtual) temperature, layer by layer, anchored to the launch altitude (pad-averaged GPS, or a manual override in Settings).

• Replaces the plain ISA formula, which ran ~500 m low at altitude on a real flight.
• Verified: at the first GPS fix the barometric altitude is within ~16 m of GPS; the baro and GPS altitude traces now overlap.
• Still works above the GPS ceiling — GPS is only the launch anchor; the altitude itself remains barometric, and it falls back to the ISA formula when no GPS anchor exists.

Shared time-series x-axis

All time-series plots now share one time axis [t0, tN], so the wind plot advances with the others before GPS lock and its data lands at the correct shared time position once locked — instead of restarting from the left edge.