From 14cf1b1d356a4a00b07f087e53c541b4dfe049fd Mon Sep 17 00:00:00 2001
From: hsiegeln <37154749+hsiegeln@users.noreply.github.com>
Date: Wed, 22 Apr 2026 16:55:29 +0200
Subject: [PATCH] feat(format): formatQuantity app-weit auf de-DE Komma-Dezimal
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Ersetzt Math.round/toFixed-Logik durch q.toLocaleString('de-DE', …).
Dezimaltrennzeichen ist jetzt konsistent ein Komma (0,5 statt 0.5).
Tests aktualisiert; alle 316 Tests + svelte-check grün.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 src/lib/quantity-format.ts         | 8 ++++----
 tests/unit/quantity-format.test.ts | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/lib/quantity-format.ts b/src/lib/quantity-format.ts
index 6346dab..653ed6f 100644
--- a/src/lib/quantity-format.ts
+++ b/src/lib/quantity-format.ts
@@ -1,7 +1,7 @@
 export function formatQuantity(q: number | null): string {
   if (q === null || q === undefined) return '';
-  const rounded = Math.round(q);
-  if (Math.abs(q - rounded) < 0.01) return String(rounded);
-  // auf max. 2 Nachkommastellen, trailing Nullen raus
-  return q.toFixed(2).replace(/\.?0+$/, '');
+  return q.toLocaleString('de-DE', {
+    maximumFractionDigits: 2,
+    useGrouping: false
+  });
 }
diff --git a/tests/unit/quantity-format.test.ts b/tests/unit/quantity-format.test.ts
index a631b06..498fc6f 100644
--- a/tests/unit/quantity-format.test.ts
+++ b/tests/unit/quantity-format.test.ts
@@ -16,10 +16,10 @@ describe('formatQuantity', () => {
   });
 
   it('renders fractional with up to 2 decimals, trailing zeros trimmed', () => {
-    expect(formatQuantity(0.5)).toBe('0.5');
-    expect(formatQuantity(0.333333)).toBe('0.33');
-    expect(formatQuantity(1.1)).toBe('1.1');
-    expect(formatQuantity(1.1)).toBe('1.1');
+    expect(formatQuantity(0.5)).toBe('0,5');
+    expect(formatQuantity(0.333333)).toBe('0,33');
+    expect(formatQuantity(1.1)).toBe('1,1');
+    expect(formatQuantity(1.1)).toBe('1,1');
   });
 
   it('handles zero', () => {