MiElHVAC auto-enable i-See widevane when setting AirDirection (#24860)

* MIELHVAC New features and bug fixes

## Changelog

### Bug Fixes

**Memory leak in `miel_hvac_pre_init()`** — `goto del` jumped past the `free(sc)` label, leaking the allocated struct on serial init failure. Replaced with explicit `delete`/`free`/`return`.

**`remotetemp_clear` semantics inverted** — variable was `true` on boot causing a CLR frame to be sent before any sensor registered. Renamed to `remotetemp_active`, initialised `false`.

**`HVACSetPurify` used wrong map** — `airdirection_map` was passed instead of `purifier_map`.

**`0x08` Set Run State flags wrong byte order** — flags are little-endian on the wire (ref: muart-group/muart-group.github.io#17). Removed `htons()` from all `0x08` flag assignments.

**`widevane_isee` false positives** — values like `0x84`/`0x85`/`0x8c` (ISEE bit + position nibble) incorrectly reported `AirDirection:"even"`. Reverted to exact-match for `0x80`, `0x28`, `0xaa`.

---

### New Features

**`0x42` HVAC Options polling** — added `miel_hvac_data_hvac_options` struct and `MIEL_HVAC_REQUEST_HVAC_OPTIONS` request. The unit is polled for Purifier, NightMode and EconoCool state. Requires short request form (len=1). Results stored in `sc_hvac_options` and published in SENSOR and HVACSETTINGS when `cap_run_state=true`.

**Run State commands (`0x41 0x08`)** — new commands `HVACSetPurify`, `HVACSetNightMode`, `HVACSetEconoCool` and `HVACSetAirDirection` sent via `0x08` on units that report `cap_run_state=true`. Optimistic update to `sc_hvac_options` applied before confirmation.

**EconoCool** — `0x08` byte 14, flag `0x10`, COOL mode only. Command `HVACSetEconoCool on|off`.

**Base Capabilities (`0x5B 0xC9`)** — queried once after connecting. Parsed into `miel_hvac_capabilities`. Results published flat inside `MiElHVAC` as `*Supported` fields. Temperature ranges published as °C. Raw packet in `CapabilitiesHex`.

**Capabilities-aware command validation** — commands blocked when unit reports feature unavailable: modes (heat/dry/fan), temperature range from capabilities, fan speeds, run state commands return `NotSupported` or `ControlNotSupported`.

**`0x42` polling skip** — skipped on units with `cap_run_state=false`, eliminating recurring timeouts.

**`miel_hvac_append_settings_json()`** — shared helper replacing ~80 lines of duplicated JSON code between SENSOR and HVACSETTINGS topics.

---

### JSON Changes

- `Power` (W) and `Energy` (kWh) published inside `MiElHVAC` and also in a separate `ENERGY{}` object outside `MiElHVAC` for Home Assistant auto-discovery
- `Purifier`, `NightMode`, `EconoCool` shown in SENSOR and HVACSETTINGS when `cap_run_state=true`; otherwise omitted
- `AirDirection` always shows current state from `0x62 0x02` regardless of control support
- `*Supported` capability fields published flat inside `MiElHVAC`: `HeatSupported`, `DrySupported`, `FanSupported`, `VaneVSupported`, `SwingSupported`, `AutoFanSupported`, `OutdoorTempSupported`, `AirDirectionSupported`, `PurifierSupported`, `NightModeSupported`, `EconoCoolSupported`

---

### Tested on
MSZ-LN25VG2W — `cap_run_state=false`, temp ranges 16–31 °C cool/auto, 10–31 °C heat, 5 fan speeds.

* Extend AirDirection capability, added web ui energy sensor, cleanup

### AirDirection — respect i-See sensor presence

`AirDirection` now requires three conditions instead of just the vertical vane capability:
- `cap_vane_v` — unit has a vertical vane
- `sc_has_isee` — i-See sensor observed at runtime (widevane ever seen with bit `0x80`, or value `0x28`/`0xaa`)
- `cap_run_state` — unit supports `0x08` for control

Resulting behaviour:

| `cap_vane_v` | `sc_has_isee` | `cap_run_state` | `AirDirection` visible | `AirDirectionSupported` |
|:-:|:-:|:-:|:-:|:-:|
| ❌ | — | — | hidden | `not_supported` |
| ✅ | ❌ | — | hidden | `not_supported` |
| ✅ | ✅ | ❌ | shown | `control_not_supported` |
| ✅ | ✅ | ✅ | shown | `on` |

Units with vertical + horizontal vanes but no i-See sensor now correctly report `AirDirectionSupported:"not_supported"` and omit `AirDirection` from both `MiElHVAC` and `HVACSettings` JSON.

### Capability field renames

For naming consistency across the `*Supported` fields:
- `cap_heat` → `cap_mode_heat`, `HeatSupported` → `ModeHeatSupported`
- `cap_dry` → `cap_mode_dry`, `DrySupported` → `ModeDrySupported`
- `cap_fan_mode` → `cap_mode_fan`, `FanSupported` → `ModeFanSupported`
- `cap_auto_fan` → `cap_fan_auto`, `AutoFanSupported` → `FanAutoSupported`
- `OutdoorTempSupported` → `OutdoorTemperatureSupported`
- `TempCool` / `TempHeat` / `TempAuto` → `SetTemperatureCoolMinMax` / `SetTemperatureHeatMinMax` / `SetTemperatureAutoMinMax`

### Energy values

- `Power` (W) and `Energy` (kWh) published both inside `MiElHVAC` and in a standard Tasmota `ENERGY{}` sub-object (`Power`/`Total`) for Home Assistant auto-discovery.
- Added Web UI rows via `FUNC_WEB_SENSOR` showing instantaneous power (W) and cumulative total (kWh) on the Tasmota main page.

### Runtime i-See detection

New `sc_has_isee` flag in `miel_hvac_softc`, set in `miel_hvac_input_settings` on the first widevane value indicating i-See state. Once set, stays set for the session.

**Practical note:** after boot, the flag starts `false`. Units with i-See that has never been activated since Tasmota started will show `AirDirection` as hidden until i-See is first used (via IR remote or `HVACSetAirDirection`). Safe default — prevents showing misleading values on units without i-See.

* MiElHVAC Full support of AirDirection control

* MiELHVAC fix globals, VLA, duplicate JSON fields and float formatting

## Summary

- **Remove file-scope globals** (`temp_type`, `remotetemp_active`,
  `remotetemp_auto_clear_time`, `remotetemp_last_call_time`,
  `remotetemp_half`): moved into `miel_hvac_softc` as `sc_temp_type`
  and `sc_remotetemp_*`. All references updated. Eliminates potential
  conflict with other drivers sharing the same translation unit.

- **Fix VLA in `miel_hvac_send`**: `char hex_d[(len + 1) * 2]` replaced
  with fixed-size `(MIEL_HVAC_DATABUFLEN + 1) * 2`. Variable-length
  arrays on the stack are disallowed by `-Wvla` and unreliable on
  embedded targets.

- **Make `temp_type` explicit**: helper functions `miel_hvac_deg2temp`,
  `miel_hvac_temp2deg`, `miel_hvac_roomtemp2deg` now take `bool
  temp_type` as a parameter. Detection of the extended encoding moved
  from render functions to `miel_hvac_input_data()`, removing a hidden
  side effect inside JSON serialisation code.

- **Remove duplicate JSON fields**: `Purifier`, `NightMode`, `EconoCool`
  were emitted twice (from both the settings block and the options
  block). Options block now only emits `OptionsHex`.

- **Fix `RemoteTemperatureSensorAutoClearTime` JSON type**: was
  serialised as a string (`"10000"`), now a proper JSON number (`10000`).

- **Bool consistency**: assignments `= 1` / `= 0` on `bool` fields
  replaced with `= true` / `= false`.

* MiElHVAC auto-enable i-See widevane when setting AirDirection

### Problem
`HVACSetAirDirection` (`indirect` / `direct` / `even`) sets the i-See airflow
direction via a `0x41 0x08` runstate packet (flag `0x2000`). The unit only
honors that value once i-See airflow control is enabled, which requires
`widevane=0x80` sent in a `0x01` settings packet.

Until now the user had to manually run `HVACSetWideVane isee` **before**
`HVACSetAirDirection`, otherwise the direction change was silently ignored.

### Change
`HVACSetAirDirection` now sets the widevane to
`MIEL_HVAC_SETTINGS_WIDEVANE_ISEE` (`0x80`) in the same call.

The dispatcher always sends the settings (`0x01`) packet before the runstate
(`0x41`) packet, so the unit receives the i-See enable first and the direction
value on the following tick — no manual ordering required.

### Notes
- `off` is unchanged (still expressed as `widevane=0x8c` via `0x01`).
- The existing capability guard (`cap_vane_v` + `sc_has_isee`) is unchanged.

tasmota/tasmota_xdrv_driver/xdrv_44_miel_hvac.ino

@@ -1432,6 +1432,14 @@ miel_hvac_cmnd_setairdirection(void)
 	case MIEL_HVAC_SETTINGS_AIRDIRECTION_EVEN:
 	{
 		struct miel_hvac_msg_update_runstate *rs = &sc->sc_runstate_update;
+
+		/* Enable i-See airflow control first: widevane=0x80 via 0x01.
+		 * The dispatcher sends the settings (0x01) packet before the
+		 * runstate (0x41) packet, so this reaches the unit ahead of the
+		 * airdirection value below. */
+		update->flags     |= htons(MIEL_HVAC_SETTINGS_F_WIDEVANE);
+		update->widevane   = MIEL_HVAC_SETTINGS_WIDEVANE_ISEE;
+
 		rs->eight          = 0x08;
 		rs->flags         |= htons(MIEL_HVAC_RUNSTATE_F_AIRDIRECTION);
 		rs->airdirection   = e->byte;