[Bug]: Draft note links are silently dropped on publish (entity_type casing mismatch) #222

Describe the bug

Links added to a draft note — manually or via a QC suggestion — never make it to ShotGrid. In publish-notes (backend/src/main.py:1142), each link is resolved with ENTITY_MODELS.get(link.entity_type), but ENTITY_MODELS is keyed lowercase ("shot", "version", …) while links store the capitalized type copied from /search results ("Shot"), so the lookup returns None and the link is skipped with no error or log. The published note only gets the links the provider adds itself (version, parent shot, playlist). Pre-existing since #66; reproduced on main and #221. Fix is a one-liner — normalise with .lower() (or key ENTITY_MODELS by the canonical type) — plus a test that a draft with a Shot link produces that link in note_links. Related: to/cc are also never published (to_users=[] # TODO on the same endpoint), which could be fixed in the same pass.

Steps to reproduce

1. Stand the app up
2. try make changes to links
3. see that they don't publish to SG.

Expected behavior

Link changes publish to SG

Actual behavior

Link changes don't publish to SG

Version or commit

#66 Notes Publish