BulkTagEditor optimistically marked only the clicked tag as common after a bulk
add, so tags applied by auto-tag rules (resolved server-side) never appeared.
Refetch /files/bulk/common-tags after each change and rebuild the common/partial
sets from the response, so rule-applied tags and partial->common shifts show up.
Backend bulk path was already correct — covered now by TestBulkTagAutoRule.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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