Add support for the air circulation feature

[mathieuletyrant]

The Cozytouch app exposes an air circulation mode — "Brassage d'air", described in the app as harmonising temperature and air quality between the rooms of the system — with a speed and a duration. None of it reached HA: the four capabilities behind it were unmapped, so the feature simply did not exist in the integration.

How they were identified

By diffing the raw setupviewv2 payload around each action in the app. Switching it on for 30 minutes moved three capabilities on all three of my rooms at once:

t=612413   102024 : 0 -> 1     on/off
t=612419   102021 : 0 -> 30    duration, in minutes
t=612424   102023 : 0 -> 30    remaining

A second dump two minutes later separated the last two: 102021 stayed at 30 while 102023 had dropped to 28, so 102021 is the setpoint and 102023 counts down.

A third capture changed only the speed. 102004 read 2 while the app showed Moyenne and moved to 3 on Rapide, again on all three rooms, which identifies it as the speed.

What this adds

Capability	Entity
102004	select	Air circulation speed — low / medium / high
102024	switch	Air circulation
102021	number	Total time, 15 to 300 minutes
102023	sensor	Remaining time

The bounds are not guessed: the app's duration picker runs from 00:15 to 05:00 in 15 minute steps, which is exactly the static 15 and 300 sitting in 102025 and 102026 next to the duration.

Translations added for en and fr, plus strings.json.

All three speeds observed

102004 read 2 with the app showing Moyenne, 3 on Rapide and 1 on Lente, each time on all three rooms at once. Nothing in this mapping is inferred.

Independent of #160, #161 and #162 — it touches capability.py only in new elif branches.

🤖 Generated with Claude Code

[mathieuletyrant]

[mathieuletyrant]

Update: the last inferred value is now observed. 102004 read 1 with the app showing Lente, after 2 for Moyenne and 3 for Rapide. Force-pushed, the code comment and the description no longer claim anything by elimination.

[mathieuletyrant]

The bounds are no longer inferred. The capability list shared in #86 names them outright:

102004  AIR_MIXING_SPEED
102021  AIR_MIXING_DURATION
102023  AIR_MIXING_DURATION_REMAINING_TIME
102024  AIR_MIXING_ACTIVATION
102025  AIR_MIXING_MIN_DURATION
102026  AIR_MIXING_MAX_DURATION

102025 and 102026 are exactly the min and max duration I had guessed from their static 15 and 300, and the four capabilities this PR maps carry the roles the diffs suggested. Nothing in it rests on inference any more.