refactor(withdraw): 优化快速提现金额计算逻辑

- 引入舍入单位计算，避免小额差值导致的选项过多问题
- 实现最小最大钻石数量的舍入处理
- 重构快速提现金额生成算法，提高计算精度
- 使用索引映射方式重新实现金额选项生成
- 更新项目索引统计信息，反映代码结构变化

AGENTS.md

@@ -1,7 +1,7 @@
 <!-- gitnexus:start -->
 # GitNexus — Code Intelligence
 
-This project is indexed by GitNexus as **36-character-flower** (3095 symbols, 6119 relationships, 264 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
+This project is indexed by GitNexus as **36-character-flower** (3365 symbols, 6609 relationships, 288 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
 
 > If any GitNexus tool warns the index is stale, run `npx gitnexus analyze` in terminal first.
 

CLAUDE.md

@@ -1,7 +1,7 @@
 <!-- gitnexus:start -->
 # GitNexus — Code Intelligence
 
-This project is indexed by GitNexus as **36-character-flower** (3095 symbols, 6119 relationships, 264 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
+This project is indexed by GitNexus as **36-character-flower** (3365 symbols, 6609 relationships, 288 execution flows). Use the GitNexus MCP tools to understand code, assess impact, and navigate safely.
 
 > If any GitNexus tool warns the index is stale, run `npx gitnexus analyze` in terminal first.
 

src/hooks/use-withdraw-vm.ts

@@ -58,27 +58,39 @@ function getWithdrawDiamondBounds(
 
 function getQuickWithdrawAmounts(bounds: WithdrawDiamondBounds) {
   const { maximumDiamonds, minimumDiamonds } = bounds
-  const availableOptionCount = maximumDiamonds - minimumDiamonds + 1
+  const roundingUnit =
+    10 ** Math.max(0, Math.floor(Math.log10(maximumDiamonds)) - 1)
+  const roundedMinimumDiamonds =
+    Math.ceil(minimumDiamonds / roundingUnit) * roundingUnit
+  const roundedMaximumDiamonds =
+    Math.floor(maximumDiamonds / roundingUnit) * roundingUnit
+
+  if (roundedMinimumDiamonds > roundedMaximumDiamonds) {
+    return []
+  }
+
+  const availableOptionCount =
+    (roundedMaximumDiamonds - roundedMinimumDiamonds) / roundingUnit + 1
 
   if (availableOptionCount <= QUICK_WITHDRAW_OPTION_COUNT) {
     return Array.from(
       { length: availableOptionCount },
-      (_, index) => minimumDiamonds + index,
+      (_, index) => roundedMinimumDiamonds + index * roundingUnit,
     )
   }
 
-  const amounts = new Set<number>([minimumDiamonds, maximumDiamonds])
-  const span = maximumDiamonds - minimumDiamonds
+  const lastOptionIndex = availableOptionCount - 1
+  const optionIndexes = new Set<number>([0, lastOptionIndex])
 
   for (let index = 1; index < QUICK_WITHDRAW_OPTION_COUNT - 1; index += 1) {
-    amounts.add(
-      Math.round(
-        minimumDiamonds + (span * index) / (QUICK_WITHDRAW_OPTION_COUNT - 1),
-      ),
+    optionIndexes.add(
+      Math.round((lastOptionIndex * index) / (QUICK_WITHDRAW_OPTION_COUNT - 1)),
     )
   }
 
-  return [...amounts].sort((left, right) => left - right)
+  return [...optionIndexes]
+    .sort((left, right) => left - right)
+    .map((index) => roundedMinimumDiamonds + index * roundingUnit)
 }
 
 function getCurrencyExchangeRate(