Fix relink: FilePond addFile API, yellow border, limbo type + await

- Fix addFile argument format: FilePond.addFile() takes (source, options)
  as two separate arguments, not a single {source, options} object.
- Change .filepond--file default border from accent-yellow to accent-green.
  Existing files loaded in edit mode have type 'local' and never reach
  processing-complete state, so they got the yellow border.
- Change relinked file add from type 'local' to 'limbo'. Limbo items
  go through DID_COMPLETE_ITEM_PROCESSING which triggers onprocessfile
  (ensures syncOrderInput runs with serverId available) and renders
  the green checkmark visual.
- Await addFile Promise and close modal in .then() instead of
  immediately, ensuring the item is created before cleanup.
- Remove duplicate modal.close() after the addFile block.

TODO.md

@@ -30,6 +30,7 @@
 - [x] JS: integrate relink button into FilePond UI (XamxamOpenFileBrowser + XamxamRelinkFile)
 - [x] CSS: .relink-modal + .file-browser styles in form.css
 - [x] Fix: relinked file not appearing in FilePond pool — add file metadata to addFile() options and extensive diag logging
+- [x] Fix: addFile called with single object instead of (source, options) — FilePond API mismatch prevented files from loading
 - [ ] Migration: rename existing theses/ directories to documents/ on disk and update DB paths
 
 ## Trash policy