v0.6.28 — Tyre pressure 0/1 sentinel for all families (#29)

Summary

Widens the tyre-pressure validity filter to all tyre_pressure_* families (actual, required, differential). Thanks @Pulpyyyy for the data-dictionary analysis and empirical snapshots in #29.

Tyre pressure

• 0 / 1 are now unavailable on required and differential sensors too.
• Fixes misleading 1 bar when the portal sends the invalid status code.

Test plan

• On vehicles with indirect TPMS: required/differential sensors show unavailable instead of constant 1 bar
• Actual tyre pressure sensors unchanged when live scaled values arrive (e.g. 24)