🧪 Add error path test for BreezyWeatherFetcher.fetchLocalWeather

[LeanBitLab]

🎯 What: Missing error path test for BreezyWeatherFetcher.fetchLocalWeather. The JSON parse exception block was not fully documented/tested with its rationale explicitly.
📊 Coverage: Covered exceptions occurring during JSON parsing, asserting fetchLocalWeather correctly catches them and returns null. (Note: A previously created test covered this gracefully).
✨ Result: A more robust and reliable test suite catching real malformed JSON decoding failures.

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PR created automatically by Jules for task 13207834427788664563 started by @LeanBitLab

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