Fix two related issues with bulk model updates in Kanban view:
1. Bulk update now properly invalidates React Query cache
- Changed handleBulkUpdate and bulk verify handler to call loadFeatures()
- This ensures UI immediately reflects bulk changes
2. Custom provider models (GLM, MiniMax, etc.) now display correctly
- Added fallback lookup in PhaseModelSelector by model ID
- Updated mass-edit-dialog to track providerId after selection