refactor: Update Race To step UI and logic

- Renames 'Offen' to 'Endlos' and moves it to a separate line.
- Extends quick-pick buttons to include 1-9.
- Removes 'Custom' button and makes numeric input always visible.
- Updates placeholder text for the custom input.
- Closes #10

src/components/NewGame.module.css

@@ -215,4 +215,63 @@
 .game-type-btn.selected {
     background: #4a4a4a;
     border-color: #777;
+}
+
+.race-to-selection {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
+    gap: 12px;
+    width: 100%;
+    margin: 16px 0;
+}
+
+.race-to-btn {
+    background: #2a2a2a;
+    border: 2px solid #333;
+    color: #fff;
+    font-size: 1.3rem;
+    font-weight: 600;
+    padding: 16px 8px;
+    border-radius: 8px;
+    cursor: pointer;
+    text-align: center;
+    transition: background 0.2s, border-color 0.2s;
+    min-height: 70px;
+}
+
+.race-to-btn:hover {
+    background: #333;
+    border-color: #555;
+}
+
+.race-to-btn.selected {
+    background: #4a4a4a;
+    border-color: #777;
+}
+
+.custom-race-to {
+    display: flex;
+    gap: 12px;
+    margin-top: 24px;
+    align-items: center;
+}
+
+.custom-race-to input {
+    flex-grow: 1;
+}
+
+.custom-race-to .arrow-btn {
+    width: 60px;
+    height: 60px;
+    font-size: 32px;
+    flex-shrink: 0;
+}
+
+.endlos-container {
+    width: 100%;
+    margin-bottom: 12px;
+}
+
+.endlos-btn {
+    width: 100%;
 }