feat: add real-time collaborative shopping list at /cospend/list

Real-time shopping list with SSE sync between multiple clients, automatic
item categorization using embedding-based classification + Bring icon
matching, and card-based UI with category grouping.

- SSE broadcast for live sync (add/check/remove items across tabs)
- Hybrid categorizer: direct catalog lookup → category-scoped embedding
  search → per-category default icons, with DB caching
- 388 Bring catalog icons matched via multilingual-e5-base embeddings
- 170+ English→German icon aliases for reliable cross-language matching
- Move cospend dashboard to /cospend/dash, /cospend redirects to list
- Shopping icon on homepage links to /cospend/list

scripts/download-models.ts

@@ -7,6 +7,7 @@ import { pipeline } from '@huggingface/transformers';
 const MODELS = [
 	'Xenova/all-MiniLM-L6-v2',
 	'Xenova/multilingual-e5-small',
+	'Xenova/multilingual-e5-base',
 ];
 
 for (const name of MODELS) {