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/views/LedgerView.vue

@@ -120,8 +120,9 @@ watch(fAmount, () => {
 })
 
 async function submit() {
-  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
   }
@@ -137,7 +138,7 @@ async function submit() {
       category: fCategory.value,
       amount: Math.round(v * 100),
       date: fDate.value,
-      note: fNote.value.trim(),
+      note: String(fNote.value ?? '').trim(),
       reimbursable: fType.value === 'expense' && fReimb.value ? 1 : 0,
       reimbursed: 0
     })
@@ -154,6 +155,8 @@ async function submit() {
   showToast('记账已添加')
   submitting.value = false
 }
+const formDirty = computed(() => String(fAmount.value ?? '').trim() !== '' || String(fNote.value ?? '').trim() !== '')
+
 function resetForm() {
   fAmount.value = ''
   fNote.value = ''
@@ -262,7 +265,7 @@ async function confirmDelete() {
       </div>
       <div v-if="fError" class="form-error">{{ fError }}</div>
       <div class="form-footer">
-        <button class="btn btn-sm" :disabled="!(fAmount.trim() || fNote.trim())" @click="resetForm">重置</button>
+        <button class="btn btn-sm" :disabled="!formDirty" @click="resetForm">重置</button>
         <button class="btn btn-primary btn-sm" :disabled="submitting" @click="submit">添加记录</button>
       </div>
     </div>