fix: 增强存为我的调试日志和错误提示，修复空名称静默失败问题

- 区分「取消」(null) 和「清空名称后确认」(空字符串) 两种情况
  前者静默返回，后者提示「请输入配方名称」
- 添加 console.log/error 方便在浏览器控制台定位问题
- 成功 toast 改为「已保存！可在「配方查询 → 我的配方」查看」提示去向
- 错误 toast 延长至 3s，并显示 status code
- saveRecipe：loadRecipes 失败不再抛出，保证保存成功后不误报失败

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/RecipeDetailOverlay.vue

@@ -672,17 +672,26 @@ async function saveToDiary() {
     return
   }
   const name = await showPrompt('保存为我的配方，名称：', recipe.value.name)
-  if (!name) return
+  // null = user cancelled (clicked 取消)
+  if (name === null) return
+  // empty string = user cleared the name field
+  if (!name.trim()) {
+    ui.showToast('请输入配方名称')
+    return
+  }
   try {
-    await recipesStore.saveRecipe({
-      name,
+    const payload = {
+      name: name.trim(),
       note: recipe.value.note || '',
       ingredients: recipe.value.ingredients.map(i => ({ oil_name: i.oil, drops: i.drops })),
       tags: recipe.value.tags || [],
-    })
-    ui.showToast('已保存到「我的配方」')
+    }
+    console.log('[saveToDiary] saving recipe:', payload)
+    await recipesStore.saveRecipe(payload)
+    ui.showToast('已保存！可在「配方查询 → 我的配方」查看')
   } catch (e) {
-    ui.showToast('保存失败: ' + (e?.message || '未知错误'))
+    console.error('[saveToDiary] failed:', e)
+    ui.showToast('保存失败：' + (e?.message || e?.status || '未知错误'), 3000)
   }
 }
 

frontend/src/stores/recipes.js

@@ -53,7 +53,12 @@ export const useRecipesStore = defineStore('recipes', () => {
       return data
     } else {
       const data = await api.post('/api/recipes', recipe)
-      await loadRecipes()
+      // Refresh list; if refresh fails, still return success (recipe was saved)
+      try {
+        await loadRecipes()
+      } catch (e) {
+        console.warn('[saveRecipe] loadRecipes failed after save:', e)
+      }
       return data
     }
   }