chore: bump VERSION_NAME_BASE to 2.8.0 for release

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Opening commit for the release/2.8.0 stabilization branch. versionCode
remains git-derived (offset 29314197 + commit count); only the base
version name is bumped here. CI overrides this with the release tag.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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