Add diffs key to FileChange class

[MarcelGeo]

from compare file_set is coming diffs key as diffs are accidentaly diffs key.

[coveralls]

Pull Request Test Coverage Report for Build 21880134649

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 82.377%

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Totals
Change from base Build 21823644831:	0.003%
Covered Lines:	4235
Relevant Lines:	5141

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💛 - Coveralls

[Copilot]

Pull request overview

This PR updates the local change model to accept a diffs key (a list of diff filenames) when constructing FileChange instances from dictionaries, matching metadata produced during pull/compare flows.

Changes:

• Add a diffs attribute to FileChange in mergin/local_changes.py.
• Update test_local_changes_from_dict to include a diffs key in sample input data.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
mergin/local_changes.py	Extends FileChange dataclass to include optional diffs list.
mergin/test/test_local_changes.py	Updates test fixture data to include diffs key when building FileChange from dicts.

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[Copilot]

The new diffs field defaults to None, but its doc comment describes it as a list of diff filenames. To avoid forcing callers to guard against None (and to align with how chunks is modeled), consider using field(default_factory=list) and a non-optional List[str] (or normalize None to [] in __post_init__).

Suggested change

	diffs: Optional[List[str]] = None
	diffs: List[str] = field(default_factory=list)

[Copilot]

This test adds the diffs key to the input dict, but it never asserts that FileChange actually stores it. Adding an assertion like local_changes.removed[0].diffs == ["diff"] would ensure the new field is covered (and avoid the test passing if the key is silently dropped elsewhere).