\n>

Background

\n> \n> **Source:**\n> - Original PR: #4855\n> - Parent issue: #4846\n> \n> **Previous attempt context:**\n> - The previous submission did not include `src/trend_analysis/viz/__init__.py` and omitted tests for the viz modules. Missing the `__init__.py` prevents proper package import as per acceptance criteria, and lack of tests means figure creation + JSON serialization behavior is not verified.\n> - Usage of `zip(..., strict=False)` in `utils.quantile_bands()` may fail in Python versions older than 3.10, creating a compatibility risk.\n> \n>

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