fix: 无椰子油配方编辑时不显示容量/椰子油/摘要

- 无椰子油：容量不选中，摘要不显示，椰子油行不出现
- 有椰子油：自动匹配容量和稀释比例
- 新增配方默认无椰子油

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

frontend/src/views/RecipeManager.vue

@@ -317,8 +317,8 @@
           <button class="add-row-btn" @click="addOilRow">+ 添加精油</button>
         </div>
 
-        <!-- Real-time summary -->
+        <!-- Real-time summary (only when volume selected) -->
-        <div class="recipe-summary">
+        <div v-if="formVolume" class="recipe-summary">
           {{ recipeSummaryText }}
         </div>
 
@@ -749,10 +749,31 @@ function editRecipe(recipe) {
   const ings = recipe.ingredients || []
   formIngredients.value = ings.filter(i => i.oil !== '椰子油').map(i => ({ ...i, _search: i.oil, _open: false }))
   const coco = ings.find(i => i.oil === '椰子油')
-  formCocoRow.value = coco ? { ...coco, _search: '椰子油', _open: false } : { oil: '椰子油', drops: 10, _search: '椰子油', _open: false }
+  if (coco) {
+    formCocoRow.value = { ...coco, _search: '椰子油', _open: false }
+    // Guess volume from total drops
+    const eoDrops = ings.filter(i => i.oil && i.oil !== '椰子油').reduce((s, i) => s + (i.drops || 0), 0)
+    const totalDrops = eoDrops + coco.drops
+    const ml = totalDrops / DROPS_PER_ML
+    if (ml <= 2) formVolume.value = 'single'
+    else if (Math.abs(ml - 5) < 1.5) formVolume.value = '5'
+    else if (Math.abs(ml - 10) < 2.5) formVolume.value = '10'
+    else if (Math.abs(ml - 15) < 2.5) formVolume.value = '15'
+    else if (Math.abs(ml - 20) < 3) formVolume.value = '20'
+    else if (Math.abs(ml - 30) < 6) formVolume.value = '30'
+    else { formVolume.value = 'custom'; formCustomVolume.value = Math.round(ml) }
+    // Guess dilution
+    if (eoDrops > 0 && coco.drops > 0) {
+      const ratio = Math.round(coco.drops / eoDrops)
+      const options = [3,4,5,6,7,8,9,10,12,15,20]
+      formDilution.value = options.reduce((a, b) => Math.abs(b - ratio) < Math.abs(a - ratio) ? b : a)
+    }
+  } else {
+    formCocoRow.value = null
+    formVolume.value = ''
+  }
   formNote.value = recipe.note || ''
   formTags.value = [...(recipe.tags || [])]
-  calcDilutionFromIngs(recipe.ingredients)
   showAddOverlay.value = true
 }
 
@@ -765,7 +786,7 @@ function closeOverlay() {
 function resetForm() {
   formName.value = ''
   formIngredients.value = [{ oil: '', drops: 1, _search: '', _open: false }]
-  formCocoRow.value = { oil: '椰子油', drops: 10, _search: '椰子油', _open: false }
+  formCocoRow.value = null
   formNote.value = ''
   formTags.value = []
   smartPasteText.value = ''
@@ -1218,10 +1239,29 @@ function editDiaryRecipe(diary) {
   const ings = diary.ingredients || []
   formIngredients.value = ings.filter(i => i.oil !== '椰子油').map(i => ({ ...i, _search: i.oil, _open: false }))
   const coco = ings.find(i => i.oil === '椰子油')
-  formCocoRow.value = coco ? { ...coco, _search: '椰子油', _open: false } : { oil: '椰子油', drops: 10, _search: '椰子油', _open: false }
+  if (coco) {
+    formCocoRow.value = { ...coco, _search: '椰子油', _open: false }
+    const eoDrops = ings.filter(i => i.oil && i.oil !== '椰子油').reduce((s, i) => s + (i.drops || 0), 0)
+    const totalDrops = eoDrops + coco.drops
+    const ml = totalDrops / DROPS_PER_ML
+    if (ml <= 2) formVolume.value = 'single'
+    else if (Math.abs(ml - 5) < 1.5) formVolume.value = '5'
+    else if (Math.abs(ml - 10) < 2.5) formVolume.value = '10'
+    else if (Math.abs(ml - 15) < 2.5) formVolume.value = '15'
+    else if (Math.abs(ml - 20) < 3) formVolume.value = '20'
+    else if (Math.abs(ml - 30) < 6) formVolume.value = '30'
+    else { formVolume.value = 'custom'; formCustomVolume.value = Math.round(ml) }
+    if (eoDrops > 0 && coco.drops > 0) {
+      const ratio = Math.round(coco.drops / eoDrops)
+      const options = [3,4,5,6,7,8,9,10,12,15,20]
+      formDilution.value = options.reduce((a, b) => Math.abs(b - ratio) < Math.abs(a - ratio) ? b : a)
+    }
+  } else {
+    formCocoRow.value = null
+    formVolume.value = ''
+  }
   formNote.value = diary.note || ''
   formTags.value = [...(diary.tags || [])]
-  calcDilutionFromIngs(diary.ingredients)
   showAddOverlay.value = true
 }