fix: greengale basePath resolution + tag input CSS
- delete stale publication/self records that cause wrong basePath lookups
- add platform-aware fallback: match greengale docs to greengale pubs
- re-derive basePath for affected documents
- fix tag input CSS specificity (input.tag-input beats input[type="text"])
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>