Add Clean Air Optima CA-707 (#5695)

Add support for the Clean Air Optima CA-707 Smart dehumidifier.

Tested functions:

Power
Operating modes
Target humidity
Fan speed
Ionizer
Sleep mode
Temperature
Current humidity
Tank full
Defrost
The timer (DP12) is included with a note because the device firmware
only reports the last commanded value instead of the actual remaining
time.

- Please submit each new device as a separate PR on its own branch.
- Please submit additional translations separately from device
submissions, after review of whether any existing translations can be
used instead.
- Please do not update DEVICES.md or ACKNOWLEDGEMENTS.md as part of your
submission, as these files have high risk of conflicts.
- Once submitted, do not force push your branch unless it is necessary
for conflict resolution.
- If submitting a code change, please submit a bug report first making
it clear what the issue is that you are fixing, and link the report to
your PR.
- If using AI to code your changes, you must understand what the AI has
done. Vibe coded contributions without understanding by the submitter
take up a lot of review time and will be deprioritized.
- PRs with all CI errors and warnings fixed will be prioritized, so
please fix what you can (unless the error is outside the scope of your
change).

Please describe in simple terms what you are submitting. Do not paste a
multi-page AI generated rambling story here, as the maintainers do not
have time to read that.

custom_components/tuya_local/devices/cleanair_ca707_dehumidifier.yaml

@@ -0,0 +1,213 @@
+name: Dehumidifier
+
+products:
+  - id: gynthidZEhTUCoMN
+    manufacturer: Clean Air Optima
+    model: CA-707 Smart
+
+entities:
+  #
+  # Main
+  #
+  - entity: humidifier
+    class: dehumidifier
+    translation_only_key: extended
+    dps:
+      - id: 1
+        name: switch
+        type: boolean
+
+      - id: 2
+        name: mode
+        type: string
+        mapping:
+          - dps_val: "0"
+            value: normal
+          - dps_val: "1"
+            value: continuous
+          - dps_val: "2"
+            value: laundry
+          - dps_val: "3"
+            value: purify
+
+      - id: 4
+        name: humidity
+        type: integer
+        range:
+          min: 30
+          max: 80
+        mapping:
+          - step: 5
+
+      - id: 104
+        name: current_humidity
+        type: integer
+
+  #
+  # Fan speed
+  #
+  - entity: fan
+    name: Fan
+    dps:
+      - id: 1
+        name: switch
+        type: boolean
+
+      - id: 6
+        name: speed
+        type: string
+        mapping:
+          - dps_val: "1"
+            value: 33
+          - dps_val: "3"
+            value: 100
+
+  #
+  # Ionizer
+  #
+  - entity: switch
+    translation_key: ionizer
+    dps:
+      - id: 5
+        name: switch
+        type: boolean
+
+  #
+  # Sleep mode
+  #
+  - entity: switch
+    translation_key: sleep
+    dps:
+      - id: 102
+        name: switch
+        type: boolean
+
+  #
+  # Temperature
+  #
+  - entity: sensor
+    class: temperature
+    dps:
+      - id: 103
+        name: sensor
+        type: integer
+        unit: "°C"
+        class: measurement
+
+  #
+  # Timer
+  #
+  # Note: according to the official Tuya DP spec, this value should
+  # reflect the actual remaining timer duration when read, and
+  # (re)start the timer when written. In practice, this device's
+  # firmware only ever reports back the last commanded value; it does
+  # not count down and no "cancel" event is sent when the timer
+  # expires. Timers set via the physical control panel are not
+  # reported back on this DP at all. Treat this entity as "last
+  # commanded value", not as a reliable live status.
+  - entity: select
+    translation_key: timer
+    dps:
+      - id: 12
+        name: option
+        type: string
+        mapping:
+          - dps_val: "0"
+            value: cancel
+          - dps_val: "1"
+            value: "1h"
+          - dps_val: "2"
+            value: "2h"
+          - dps_val: "3"
+            value: "3h"
+          - dps_val: "4"
+            value: "4h"
+          - dps_val: "5"
+            value: "5h"
+          - dps_val: "6"
+            value: "6h"
+          - dps_val: "7"
+            value: "7h"
+          - dps_val: "8"
+            value: "8h"
+          - dps_val: "9"
+            value: "9h"
+          - dps_val: "10"
+            value: "10h"
+          - dps_val: "11"
+            value: "11h"
+          - dps_val: "12"
+            value: "12h"
+          - dps_val: "13"
+            value: "13h"
+          - dps_val: "14"
+            value: "14h"
+          - dps_val: "15"
+            value: "15h"
+          - dps_val: "16"
+            value: "16h"
+          - dps_val: "17"
+            value: "17h"
+          - dps_val: "18"
+            value: "18h"
+          - dps_val: "19"
+            value: "19h"
+          - dps_val: "20"
+            value: "20h"
+          - dps_val: "21"
+            value: "21h"
+          - dps_val: "22"
+            value: "22h"
+          - dps_val: "23"
+            value: "23h"
+          - dps_val: "24"
+            value: "24h"
+
+  #
+  # Tank full
+  #
+  - entity: binary_sensor
+    translation_key: tank_full
+    category: diagnostic
+    dps:
+      - id: 11
+        name: sensor
+        type: bitfield
+        mapping:
+          - dps_val: 8
+            value: true
+          - value: false
+
+  #
+  # General problem
+  #
+  - entity: binary_sensor
+    class: problem
+    category: diagnostic
+    dps:
+      - id: 11
+        name: sensor
+        type: bitfield
+        mapping:
+          - dps_val: 0
+            value: false
+          - dps_val: 8
+            value: false
+          - dps_val: null
+            value: false
+          - value: true
+
+      - id: 11
+        name: fault_code
+        type: bitfield
+
+  #
+  # Defrost
+  #
+  - entity: binary_sensor
+    translation_key: defrost
+    category: diagnostic
+    dps:
+      - id: 105
+        name: sensor
+        type: boolean