Handle non-object JSON responses as payload decode errors

[MaxRink]

Valid JSON device responses such as a list, null, or a string currently reach payload["id"] in MiIOProtocol.send and raise TypeError. Check that the decoded payload is a mapping and raise the existing PayloadDecodeException, so callers can handle it through DeviceException.

The regression tests use real encrypted message construction and Message.parse for each non-object JSON response, plus a valid object response to preserve normal result handling. Malformed JSON is already handled by the existing decoder and is unchanged.

Validation: 20 protocol tests passed; Ruff and git diff --check passed. This is a draft protocol robustness fix, with no Home Assistant deployment or device configuration changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.36%. Comparing base (9a00e08) to head (32f7a52).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2093      +/-   ##
==========================================
+ Coverage   84.31%   84.36%   +0.04%     
==========================================
  Files         201      201              
  Lines       20656    20659       +3     
  Branches     1121     1122       +1     
==========================================
+ Hits        17417    17429      +12     
+ Misses       3047     3036      -11     
- Partials      192      194       +2     

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[Copilot]

🟢 Approval recommended

The focused validation is correct and adequately covered by protocol-level regression tests.

0 open findings

What changed in this PR

Ensures non-object JSON device responses raise the established PayloadDecodeException instead of leaking TypeError.

Changes:

• Validate decoded responses are mappings before accessing fields.
• Add regression tests for invalid response shapes and valid objects.

File	Description
miio/​miioprotocol.py	Rejects non-object payloads with a device-level decode error.
miio/​tests/​test_protocol.py	Tests list, null, string, and object responses.

🧠 Review effort: Balanced

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