Add editable article prices with gross input and staffel tiers.

Wire PUT /prices, de-DE formatting, tax/staffel pills, and keep the category list cache in sync after photo/price updates.

src/store/categorySlice.js

@@ -223,6 +223,15 @@ const categorySlice = createSlice({
       state.articlesTotal = state.articles.length;
       state.rootArticles = state.rootArticles.filter((row) => row.sku !== sku);
     },
+    /** Keep category tile list in sync with article detail (e.g. after photo upload). */
+    patchArticleInLists(state, action) {
+      const { sku, ...fields } = action.payload;
+      if (sku == null) return;
+      const patchList = (list) =>
+        list.map((row) => (row.sku === sku ? { ...row, ...fields } : row));
+      state.articles = patchList(state.articles);
+      state.rootArticles = patchList(state.rootArticles);
+    },
   },
   extraReducers: (builder) => {
     builder
@@ -305,6 +314,7 @@ export const {
   navigateBack,
   resetCategoryState,
   removeArticleBySku,
+  patchArticleInLists,
 } = categorySlice.actions;
 
 export const selectCategoryMap = (state) => state.category.categories;