UX-MOBILE-2: Genotyp-Tabellen-Overflow behoben (scrollbar statt page-overflow)

- BreedingResultView: <table class="genotype-table"> in <div class="genotype-table-scroll"> gewrapped.
- index.css: .genotype-table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch }.
  .genotype-table td { white-space: nowrap } → Tabelle scrollt statt Zellen umzubrechen.
  width: 100% entfernt (Tabelle auto-sized to content).
- index.css: .app-main { overflow-x: hidden } → verhindert, dass breite Inhalte
  den Page-Body horizontal überlaufen lassen (document.scrollWidth == clientWidth).
- e2e/genotype-table.spec.ts (4 Tests): Wrapper sichtbar, Wrapper selbst scrollbar
  (scrollWidth > clientWidth), keine Page-Overflow auf 390px. Beide Viewports.
- Vitest 78 / e2e 106 grün.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

gerbil-manager-web/src/components/BreedingResultView.tsx

@@ -65,28 +65,30 @@ export default function BreedingResultView({ result, title }: BreedingResultView
           </button>
 
           {showGenotypes && (
-            <table className="genotype-table">
-              <thead>
-                <tr>
-                  <th>{t.genotypeLabel}</th>
-                  <th>{t.genotypePreview}</th>
-                  <th>{t.probability}</th>
-                </tr>
-              </thead>
-              <tbody>
-                {result.offspring.map((o) => (
-                  <tr key={o.genotype}>
-                    <td>
-                      <code>{o.genotype}</code>
-                    </td>
-                    <td>{o.farbschlag}</td>
-                    <td>
-                      {o.probability.percent} <small>({o.probability.text})</small>
-                    </td>
+            <div className="genotype-table-scroll">
+              <table className="genotype-table">
+                <thead>
+                  <tr>
+                    <th>{t.genotypeLabel}</th>
+                    <th>{t.genotypePreview}</th>
+                    <th>{t.probability}</th>
                   </tr>
-                ))}
-              </tbody>
-            </table>
+                </thead>
+                <tbody>
+                  {result.offspring.map((o) => (
+                    <tr key={o.genotype}>
+                      <td>
+                        <code>{o.genotype}</code>
+                      </td>
+                      <td>{o.farbschlag}</td>
+                      <td>
+                        {o.probability.percent} <small>({o.probability.text})</small>
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
           )}
         </>
       )}

gerbil-manager-web/src/index.css

@@ -77,6 +77,10 @@ a {
   padding: 1rem;
   max-width: 60rem;
   width: 100%;
+  /* UX-MOBILE-2: prevent any wide content (e.g. genotype table) from making
+     the page body scroll horizontally. The .genotype-table-scroll wrapper
+     provides the per-table horizontal scroll. */
+  overflow-x: hidden;
 }
 
 /* Tab-Leiste unten */
@@ -559,8 +563,14 @@ textarea {
   white-space: nowrap;
 }
 
+/* UX-MOBILE-2: scroll wrapper so genotype table scrolls horizontally on mobile
+   instead of overflowing the page. */
+.genotype-table-scroll {
+  overflow-x: auto;
+  -webkit-overflow-scrolling: touch;
+}
+
 .genotype-table {
-  width: 100%;
   border-collapse: collapse;
   margin-top: 0.75rem;
   font-size: 0.9rem;
@@ -571,6 +581,7 @@ textarea {
   text-align: left;
   padding: 0.4rem 0.5rem;
   border-bottom: 1px solid var(--color-border);
+  white-space: nowrap;
 }
 
 .genotype-table code {