fix(web): parse /api/commit bodies containing field separators

[msukkari]

Summary

• Fix getCommit parsing so commit bodies containing the field separator (\x1f) do not corrupt authorName, authorEmail, or parents.
• Add a focused unit test that reproduces the separator-in-body parsing failure and verifies the corrected output shape.
• Add a changelog entry under [Unreleased] → Fixed for this bugfix PR.

Reproduction (before fix)

• Reproduced with a real temporary git repository by creating a commit whose body contains \x1f and running the same split logic used by getCommit.
• Observed malformed parsing (fields_length=9, body split unexpectedly, shifted author fields).

Validation (after fix)

• Targeted parser test passes: src/features/git/getCommitApi.test.ts.
• Regression safety test passes: src/features/git/listCommitsApi.test.ts.
• Reproduction script rerun with fixed extraction logic shows correct body/author/parent mapping despite fields_length=9.

Fixes #1077

  

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