add PreisField and use it in Gegenstand

src/main.css

@@ -123,6 +123,15 @@ html {
         }
     }
 
+    & .price-input {
+        display: grid;
+        grid-template-columns: minmax(min-content, 1fr) max-content;
+
+        & input {
+            padding: 0;
+        }
+    }
+
     & .placeholder {
         font-size: 0.8em;
         border-top: 1px solid;

src/main.mjs

@@ -277,6 +277,42 @@ function get_minified_formula(formula, data) {
     return Roll.getFormula(output);
 }
 
+class PreisUnitField extends StringField {
+    constructor(options={}, context={}) {
+        return super({
+            required: true,
+            choices: {
+                "kreuzer":     "DSA41.currency.kreuzer",
+                "heller":      "DSA41.currency.heller",
+                "silbertaler": "DSA41.currency.silbertaler",
+                "dukaten":     "DSA41.currency.dukaten",
+            },
+            initial: "silbertaler",
+            ...options
+        }, context);
+    }
+}
+
+class PreisField extends SchemaField {
+    constructor() {
+        return super({
+            value: new NumberField({ integer: true, initial: 0, min: 0 }),
+            unit:  new PreisUnitField(),
+        });
+    }
+
+    _toInput(config) {
+        const value_input = this.fields["value"].toInput({ value: config.value.value, });
+        const unit_input  = this.fields["unit"] .toInput({ value: config.value.unit, localize: true });
+
+        let outer_div = document.createElement("div");
+        outer_div.className = "price-input";
+        outer_div.replaceChildren(value_input, unit_input);
+
+        return outer_div;
+    }
+}
+
 class AttributeField extends SchemaField {
     constructor() {
         return super({
@@ -685,7 +721,7 @@ class DSA41_GegenstandData extends TypeDataModel {
     static defineSchema() {
         return {
             gewicht: new NumberField({ integer: false, initial: 0, min: 0 }),
-            preis:   new NumberField({ integer: true,  initial: 0, min: 0 }),
+            preis:   new PreisField(),
         };
     }
 }