fix(trade): keep exact grams when the input shows rounded display

Percent and cash conversions no longer lose precision by rounding the gram field to three decimals.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/views/base/gold/index.vue

@@ -81,10 +81,10 @@
                           type="price" @onchange="calculateGold" />
             </a-form-item>
             <a-form-item :rules="[justNumber()]">
-              <BasicInput v-model:value="form.goldValue" :addon-before="weightUnit" :addon-bg-color="colors.primary"
+              <BasicInput v-model:value="goldValueInput" :addon-before="weightUnit" :addon-bg-color="colors.primary"
                           addon-text-color="white"
                           :place-holder="amountFieldLabel"
-                          size="large" type="text" inputmode="decimal" @onchange="calculateCash" />
+                          size="large" type="text" inputmode="decimal" />
             </a-form-item>
             <div v-if="cashValidationMessage" class="text-red-700 text-xs font-bold mt-2">
               {{ cashValidationMessage }}
@@ -289,7 +289,9 @@ import {
   calcTradeTargetCash,
   buildTradeConfirmBreakdown,
   formatTradeGramDisplay,
-  formatTradeGramInputValue,
+  tradeGramInputDisplay,
+  exactGoldFromWalletPercent,
+  goldFromGramInputDisplay,
   loadServiceFeeFromSettings,
   normalizeOrderGoldAmount,
   serviceFeePercentage,
@@ -306,7 +308,7 @@ import {
   resolveProductTradeIsBuy,
 } from '@/utils/productTradeOpen'
 import { formatCashWalletBalanceText, getWeightUnit } from '@/utils/productDealMethod'
-import { formatProductWalletBalanceText, getCashWalletBalance, getProductInventoryQuantity } from '@/utils/productAssets'
+import { formatProductWalletBalanceText, getCashWalletBalance } from '@/utils/productAssets'
 import { useWalletAssets } from '@/composables/useWalletAssets'
 import { usesQuantityTrade } from '@/utils/productCategories'
 import { useSettingsStore } from '@/store/settingsStore'
@@ -367,11 +369,7 @@ const tradeProductLabel = computed(() => {
 const amountFieldLabel = computed(() => `مقدار ${tradeProductLabel.value}`)
 
 const productWalletBalance = computed(() =>
-  getProductInventoryQuantity(
-    assetsSummary.value?.inventory_cards ?? [],
-    props.ProductItem?.id,
-    walletStore?.walletInfo?.gold
-  )
+  Number(walletStore?.walletInfo?.gold ?? 0)
 )
 
 const productWalletBalanceText = computed(() =>
@@ -443,6 +441,24 @@ const displayTradeGoldAmount = computed(() =>
   formatTradeGramDisplay(orderGoldAmount.value)
 )
 
+const goldValueInput = computed({
+  get() {
+    const display = tradeGramInputDisplay(form.value.goldValue)
+    return display === '' ? undefined : display
+  },
+  set(raw: string | number | null | undefined) {
+    const next = goldFromGramInputDisplay(raw, form.value.goldValue)
+    form.value.goldValue = next
+    if (next == null) {
+      form.value.goldCash = undefined
+      form.value.percentWallet = 0
+      inputLock.value = null
+      return
+    }
+    calculateCash(next)
+  },
+})
+
 const feeFormHint = computed(() =>
   buildTradeConfirmBreakdown({
     isBuy: isBuy.value,
@@ -634,9 +650,10 @@ function percentChange(val: number) {
       form.value.goldCash = unitCashCalculator.value * val
       calculateGold(form.value.goldCash)
     } else {
-      form.value.goldValue = formatTradeGramInputValue(parseFloat(String(unitGoldCalculator.value * val)))
-      if (form.value.goldValue != null) {
-        calculateCash(Number(form.value.goldValue))
+      const grams = exactGoldFromWalletPercent(productWalletBalance.value, val)
+      form.value.goldValue = grams > 0 ? grams : undefined
+      if (grams > 0) {
+        calculateCash(grams)
       }
     }
   } else {
@@ -646,8 +663,6 @@ function percentChange(val: number) {
   }
 }
 
-const unitGoldCalculator = computed(() => productWalletBalance.value / 100)
-
 const unitCashCalculator = computed(() => {
   return cashWalletBalance.value / 100
 })
@@ -701,7 +716,8 @@ function calculateGold(val: number) {
   if (!unit || Number.isNaN(unit)) return
 
   if (val) {
-    form.value.goldValue = formatTradeGramInputValue(calcGramFromLockedRial(val, unit, isBuy.value))
+    const grams = calcGramFromLockedRial(val, unit, isBuy.value)
+    form.value.goldValue = grams > 0 ? grams : undefined
   } else if (val.toString() === '') {
     form.value.goldValue = undefined
     inputLock.value = null