fix: 输入校验统一字符串防御（数字输入不再引发 trim 类型崩溃）

intern-log/src/components/TransactionDialog.vue

@@ -57,8 +57,9 @@ function computedCategory() {
 }
 
 function save() {
-  const v = Number(fAmount.value)
-  if (!fAmount.value.trim() || !isFinite(v) || v <= 0) {
+  const amountText = String(fAmount.value ?? '').trim()
+  const v = Number(amountText)
+  if (!amountText || !isFinite(v) || v <= 0) {
     fError.value = '请填写大于 0 的金额'
     return
   }
@@ -72,7 +73,7 @@ function save() {
     category: computedCategory(),
     amount: Math.round(v * 100),
     date: fDate.value,
-    note: fNote.value.trim(),
+    note: String(fNote.value ?? '').trim(),
     reimbursable,
     reimbursed: reimbursable && fReimbursed.value ? 1 : 0
   })