- Upload dialog now has distinct display name + filename fields, both pre-filled
from the uploaded file but independently editable
- Rename in file picker shows and edits both display name and filename separately
- Filename conflict checked against both KV store and disk (via rename_no_replace)
- Display name and filename are fully independent — no longer derived from each other
- Add find_pdf_references() helper in storage.mjs for future use
- CSS: fp-name-wrap shows display name + dim monospace filename below it;
rename mode stacks two inputs; fp-field-label for upload form labels
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
