[HK-Moebius]

Mainsail: show chamber temperature and a compact ETA

Follow-up to #1042, as suggested by @KodeStar in #1042 (comment): instead of a separate MainsailHT90 tile, this extends the existing Mainsail enhanced app so every Klipper printer with a chamber sensor gets it.

Changes

Chamber temperature (only if the printer has one)

• Klipper has no dedicated chamber object, so the app picks the first sensor with "chamber" in its name (case-insensitive) from heaters.available_sensors, in this order: heater_generic, temperature_sensor, temperature_fan, then any other object. The last step covers printer-specific objects like heater_chamber on the Prusa Pro HT90 (its sensors: heater_bed, heater_generic panel, heater_chamber, extruder). Because available_sensors only lists temperature objects, macros or fans named "chamber" can't match.
• The sensor list comes from heaters=available_sensors, added to the existing printer/objects/query request. A second query for the temperature only happens when a chamber sensor exists.
• Printers without a chamber sensor make the same number of requests as before and the tile looks unchanged.
• Shown in every state (standby, printing, complete …), so you can see the chamber heat up or cool down.

ETA

• The remaining time is shown as 2h 05min instead of Carbon's diffForHumans() ("2 hours from now"). The label changes from "Finish" to "ETA".
• Below one minute, or when the estimate is already exceeded: Soon!. Without any estimate: N/A, as before.
• The calculation is unchanged from Fix Mainsail livestats: wrong progress percentage and remaining time #1041 (slicer estimate from the file metadata minus print_duration, otherwise extrapolated from progress).

Testing

• php -l and PHPCS PSR12 (same settings as the lint workflow) pass, and so does node testRunner.js.
• On a real Prusa Pro HT90, both requests the app makes return the expected data: heaters=available_sensors lists heater_chamber, and heater_chamber=temperature returns 16.79, so the tile shows Chamber 17°C.
• Ran livestats() and the blade template against mocked Moonraker responses, including the real HT90 sensor list above:

Case	Tile
HT90 (heater_chamber), printing	Complete 40% · ETA 2h 05min · Chamber 55°C
HT90 (heater_chamber), standby	State Standby · Chamber 38°C
heater_generic chamber + temperature_sensor chamber_top	heater_generic is used
No chamber sensor, printing	Complete 25% · ETA 1h 30min (as before, new ETA format)
No chamber sensor, standby	State Standby (unchanged, no extra request)
< 1 min left / estimate exceeded	ETA Soon!

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