groceries: relevance-ranked search (plain/basic products first)

- search.ts: score on the core name (brand/size stripped): exact or query+base suffix
  (kipdij+filet), head-final compounds, prefix, inside; penalties per extra word and per
  flavour/processing word (search-words.ts, editable); bonuses for store brands, the
  query's dominant category, store count, favourites; trigram tiebreak
- groceries.synonyms table (seeded: kipdij/kippendij, pasta → spaghetti, …) expands queries
- list rows show all pack sizes of a group; group picker uses the same ranking
- scripts/groceries-search-eval.ts prints top results + latency; preflight now 8 tables

src/lib/groceries.test.ts

@@ -4,6 +4,8 @@ import {
 	cheapest,
 	formatAmount,
 	formatUnitPrice,
+	packLabel,
+	packSizes,
 	parseEuros,
 	sortByPrice,
 	toOffers,
@@ -117,3 +119,21 @@ describe('bestPerStore', () => {
 		expect(bestPerStore(toOffers([item(1, 1, 100, 100)], []), 'pack').spread).toBeNull();
 	});
 });
+
+describe('packSizes', () => {
+	it('lists distinct pack sizes smallest first with friendly units', () => {
+		expect(
+			packSizes([
+				{ unitAmount: 0.8, unit: 'kg' },
+				{ unitAmount: 0.22, unit: 'kg' },
+				{ unitAmount: 0.45, unit: 'kg' },
+				{ unitAmount: 0.22, unit: 'kg' },
+				{ unitAmount: 1.5, unit: 'kg', available: false },
+				{ unitAmount: null, unit: null }
+			])
+		).toEqual(['220 g', '450 g', '800 g']);
+		expect(packLabel(1.5, 'l')).toBe('1,5 L');
+		expect(packLabel(0.33, 'l')).toBe('330 ml');
+		expect(packLabel(6, 'piece')).toBe('6 st');
+	});
+});