FEATURES

- COMPATIBILITY
    - Add a Gitea 28.0.0-aligned release of all 10 themes and 11 mail types per theme

BUGFIXES

- THEMES (All 10)
    - Replace the removed `FileSize` function with `FormatByteSize` in release-attachment emails, preventing Gitea 28.0.0 template rendering errors
- PREVIEW AND TESTS
    - Match the preview's file-size function to Gitea 28.0.0 and render release attachments in the example data
    - Add an all-theme regression test for release attachments and the removed function

DOCS

- Update the English and Simplified Chinese READMEs and compatibility matrix for Gitea 28.0.0
- Clarify that v28.0.0 requires Gitea 28.0.0; use v1.27.3 for Gitea 1.25.0–1.27.3

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**Full Changelog:** [v1.27.3...v28.0.0](https://github.com/KenanZhu/GiteaMailTemplates/compare/v1.27.3...v28.0.0)