[jorgepb96]

Summary

Preparing a local encoder no longer shares the chat abort controller. Changing the selected Zotero item or reader while Granite downloads now leaves library preparation running. Settings displays the active model, live progress, errors and a dedicated cancel action; failed targets remain selected for retry. Prepare also validates the active encoder and computes missing vectors instead of silently returning.

Existing E5 vectors no longer count as an explicit choice. Installations without a saved model preference adopt Granite; successful explicit selections remain respected.

Closes #1307

Validation

• 108 plugin regression tests pass, including item changes during model preparation, visible error/retry state, preparing the active model and upgrade defaults with historical E5 data.
• Native before/after reproduction on Zotero 10.0.6/macOS ARM64: the previous package fails Granite activation when a synthetic book is selected during the download; the corrected code passes activation, vector reuse, cancellation, per-item history, restart/deletion and credential checks.
• Syntax checks, packaged XPI integrity and git diff --check pass.
• All local inference tests run sequentially in disposable profiles. No personal library is opened.

Compatibility and versioning

The corrected local XPI remains 5.15.5 until the next release, as requested by the maintainer; the desktop/server release version is unchanged. Model weights, vector contracts and retrieval semantics are unchanged.

English and Spanish settings feedback is included. Before/after details and reproduction command: audit/zotero-embeddings/activation-fix.md.