fix(file): treat SVG files as text instead of image

[stdrc]

Summary

SVG files are XML-based text files that can be directly read and understood by the agent. Previously, they were classified as image type, which prevented the agent from reading their content as text.

Changes

• Move .svg from _IMAGE_MIME_BY_SUFFIX to a new _TEXT_MIME_BY_SUFFIX dictionary
• Update detect_file_type() to check text MIME types first
• Add test case for SVG file type detection

Why

Since SVG is a text-based vector graphics format, treating it as text allows the agent to:

• Read and analyze SVG content directly
• Make modifications to SVG files
• Understand the structure and elements within SVG files

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[Copilot]

Pull request overview

This PR changes how SVG files are classified by the file type detection system, treating them as text instead of images to enable the agent to read and modify their XML-based content directly.

Changes:

• Moved .svg extension from _IMAGE_MIME_BY_SUFFIX to a new _TEXT_MIME_BY_SUFFIX dictionary
• Updated detect_file_type() to prioritize text MIME type checks before image checks
• Added test coverage for SVG text classification

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/kimi_cli/tools/file/utils.py	Introduces _TEXT_MIME_BY_SUFFIX dictionary with .svg entry and updates detection logic to check text types first
tests/test_file_utils.py	Adds test case to verify .svg files are classified as text type
CHANGELOG.md	Documents the SVG classification change
docs/en/release-notes/changelog.md	Documents the SVG classification change (English)
docs/zh/release-notes/changelog.md	Documents the SVG classification change (Chinese)

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[Copilot]

For consistency with how other media types are handled in this codebase (e.g., .avif, .heic, .mkv are both in _EXTRA_MIME_TYPES and their respective suffix dictionaries), consider also adding .svg to _EXTRA_MIME_TYPES. This ensures the MIME type is registered globally with the mimetypes module, matching the pattern used for other formats.

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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