Release 2.6.6: fix entity prefix, Vigicrues 206, rain rate sawtooth, config flow (#132, #133, #134, #135)

[kmich]

Summary

Fixes 4 open bug reports in a single 2.6.6 patch release.

Fixed

• Entity prefix consistency (Prefix consistency (ws_ vs weather_station_) #134): most sensors (temperature, humidity, pressure, wind, and the two Vigicrues river sensors) ignored the configured entity prefix on a fresh install and were created as sensor.weather_station_* instead of sensor.{prefix}_*, breaking the pre-built dashboards. Root cause: _attr_suggested_object_id is treated by Home Assistant as object_id_base, which gets prefixed with the device name whenever has_entity_name = True (used by every entity here) — it does not behave like a raw object id in that case. All platforms now set entity_id directly at construction time instead, which HA honours verbatim regardless of has_entity_name. This also let us drop the ad-hoc "rename back to the expected id on every restart" workaround a few platforms had grown, which had its own bug of silently reverting a user's manual rename on every restart.
• Vigicrues auto-detect and station picker stuck on HTTP 206 (Vigicrues auto-detect always returns HTTP 206 and never resolves a station list #133): Hub'Eau's station-lookup endpoint routinely answers HTTP 206 (Partial Content) rather than 200 whenever the result set doesn't include every matching station — normal, not an error, and the same coordinator already accepted it for the observations endpoint. Auto-detect and the config/options flow's station dropdown only accepted a strict 200, so auto-detect looped on a warning every ~15 minutes and the manual station picker only ever showed "Auto". Both now accept 206 alongside 200.
• Rain rate sawtooth (Rain rate #132): rain rate was computed as the instantaneous delta since the previous ~60s poll cycle. When the underlying rain-total sensor only updates in discrete bucket-tip increments, a tip landing inside one poll cycle read as a brief, disproportionate spike (e.g. 56 mm/h from a single tip) that decayed back to zero before the next tip — repeating for as long as it rained. Rain rate is now averaged over a 10-minute sliding window of the same rain-total history already tracked for the 1h/24h accumulation sensors.
• Config flow: optional sensor fields couldn't be cleared (config flow - cannot empty optional fields #135): optional source-sensor pickers (and the named-room temp/humidity/CO₂ pickers) pre-filled auto-detected guesses using a hard default=, which Home Assistant's entity picker cannot be cleared back to empty — a wrong/unavailable/wrong-type guess blocked saving entirely. Switched to description={"suggested_value": ...}, which still pre-fills the same suggestion but leaves the field genuinely clearable.

Notes

• Version bumped to 2.6.6 in manifest.json and pyproject.toml.
• Existing entities already stuck under the wrong weather_station_ prefix are not renamed automatically (would risk clobbering other user renames) — the Prefix consistency (ws_ vs weather_station_) #134 fix only affects newly created entities.
• All fixes covered by new/updated tests; full suite passes (311 tests).

Test plan

• python -m pytest tests/ — 311 passed
• python -m ruff check — clean
• Manual smoke test in a real HA instance recommended before tagging the release

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