feat(web): 新增 DateTimePicker 组件，优化手动添加账单表单

- 使用 shadcn-ui 的 Calendar + Popover 替换原生 datetime-local
- 根据收支类型动态切换分类选项（支出/收入分类）
- 切换收支类型时自动清空已选分类
- 收入模式下隐藏支付方式和交易状态输入框
- 调整表单布局为 1:1 两列

web/src/lib/components/bills/ManualBillInput.svelte

@@ -7,21 +7,21 @@
   import { Label } from '$lib/components/ui/label';
   import { Badge } from '$lib/components/ui/badge';
   import * as Table from '$lib/components/ui/table';
+  import { DateTimePicker } from '$lib/components/ui/date-time-picker';
   import { createManualBills, type ManualBillInput } from '$lib/api';
+  import { expenseCategories, incomeCategories } from '$lib/data/categories';
   import Plus from '@lucide/svelte/icons/plus';
   import Trash2 from '@lucide/svelte/icons/trash-2';
   import Send from '@lucide/svelte/icons/send';
   import Loader2 from '@lucide/svelte/icons/loader-2';
   import CheckCircle from '@lucide/svelte/icons/check-circle';
   import AlertCircle from '@lucide/svelte/icons/alert-circle';
-  import Clock from '@lucide/svelte/icons/clock';
 
   interface Props {
-    categories: string[];
     onSuccess?: () => void;
   }
 
-  let { categories, onSuccess }: Props = $props();
+  let { onSuccess }: Props = $props();
 
   // 获取当前日期时间（格式化为 YYYY-MM-DDTHH:mm）
   function getCurrentDateTimeLocal(): string {
@@ -43,8 +43,7 @@
 
   // 表单状态
   let formData = $state({
-    time: '',
-    timeLocal: getCurrentDateTimeLocal(), // 用于时间选择器的格式
+    time: getCurrentDateTime(),
     category: '',
     merchant: '',
     description: '',
@@ -55,6 +54,13 @@
     remark: '',
   });
 
+  // 根据收支类型动态计算分类列表
+  let currentCategories = $derived(
+    formData.income_expense === '收入' 
+      ? [...incomeCategories] 
+      : [...expenseCategories]
+  );
+
   // 待提交的账单列表
   let pendingBills = $state<ManualBillInput[]>([]);
 
@@ -74,6 +80,8 @@
   function handleIncomeExpenseChange(value: string | undefined) {
     if (value !== undefined) {
       formData.income_expense = value;
+      // 切换收支类型时清空已选分类（因为分类列表会变化）
+      formData.category = '';
     }
   }
 
@@ -89,19 +97,11 @@
     return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
   }
 
-  // 设置当前时间
-  function setCurrentTime() {
-    formData.timeLocal = getCurrentDateTimeLocal();
-    formData.time = convertDateTimeLocal(formData.timeLocal);
+  // 处理日期时间变化
+  function handleDateTimeChange(value: string) {
+    formData.time = value;
   }
 
-  // 监听时间选择器变化
-  $effect(() => {
-    if (formData.timeLocal) {
-      formData.time = convertDateTimeLocal(formData.timeLocal);
-    }
-  });
-
   // 验证表单
   function validateForm(): string | null {
     if (!formData.time) return '请输入交易时间';
@@ -137,8 +137,7 @@
     const savedCategory = formData.category;
     const savedIncomeExpense = formData.income_expense;
     formData = {
-      time: '',
-      timeLocal: getCurrentDateTimeLocal(),
+      time: getCurrentDateTime(),
       category: savedCategory,
       merchant: '',
       description: '',
@@ -197,9 +196,9 @@
   }
 </script>
 
-<div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
+<div class="grid grid-cols-1 lg:grid-cols-2 gap-6">
   <!-- 左侧：输入表单 -->
-  <Card.Root class="lg:col-span-2">
+  <Card.Root>
     <Card.Header>
       <Card.Title class="flex items-center gap-2">
         <Plus class="h-5 w-5" />
@@ -212,18 +211,11 @@
         <!-- 交易时间 -->
         <div class="space-y-2 sm:col-span-2">
           <Label for="time">交易时间 *</Label>
-          <div class="flex gap-2">
-            <input
-              id="time"
-              type="datetime-local"
-              bind:value={formData.timeLocal}
-              class="flex-1 h-10 rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50"
-            />
-            <Button variant="outline" size="icon" onclick={setCurrentTime} title="设置为当前时间">
-              <Clock class="h-4 w-4" />
-            </Button>
-          </div>
-          <p class="text-xs text-muted-foreground">已选择：{formData.time || '未选择'}</p>
+          <DateTimePicker
+            bind:value={formData.time}
+            onchange={handleDateTimeChange}
+            placeholder="选择交易时间"
+          />
         </div>
 
         <!-- 分类 -->
@@ -235,7 +227,7 @@
             </Select.Trigger>
             <Select.Portal>
               <Select.Content>
-                {#each categories as cat}
+                {#each currentCategories as cat}
                   <Select.Item value={cat}>{cat}</Select.Item>
                 {/each}
               </Select.Content>
@@ -284,15 +276,16 @@
 
         <!-- 商品说明 -->
         <div class="space-y-2 sm:col-span-2">
-          <Label for="description">商品说明</Label>
+          <Label for="description">{formData.income_expense === '收入' ? '收入说明' : '商品说明'}</Label>
           <Input
             id="description"
             type="text"
-            placeholder="购买的商品或服务"
+            placeholder={formData.income_expense === '收入' ? '收入来源或说明' : '购买的商品或服务'}
             bind:value={formData.description}
           />
         </div>
 
+        {#if formData.income_expense === '支出'}
         <!-- 支付方式 -->
         <div class="space-y-2">
           <Label for="pay_method">支付方式</Label>
@@ -314,6 +307,7 @@
             bind:value={formData.status}
           />
         </div>
+        {/if}
 
         <!-- 备注 -->
         <div class="space-y-2 sm:col-span-2">
@@ -336,7 +330,7 @@
   </Card.Root>
 
   <!-- 右侧：待提交列表 -->
-  <Card.Root class="lg:col-span-1">
+  <Card.Root>
     <Card.Header>
       <div class="flex items-center justify-between">
         <div>

web/src/lib/components/ui/date-time-picker/date-time-picker.svelte

@@ -0,0 +1,137 @@
+<script lang="ts">
+  import { Calendar } from "$lib/components/ui/calendar";
+  import * as Popover from "$lib/components/ui/popover";
+  import { Button } from "$lib/components/ui/button";
+  import { Input } from "$lib/components/ui/input";
+  import { cn } from "$lib/utils";
+  import CalendarIcon from "@lucide/svelte/icons/calendar";
+  import Clock from "@lucide/svelte/icons/clock";
+  import ChevronDown from "@lucide/svelte/icons/chevron-down";
+  import { CalendarDate, type DateValue } from "@internationalized/date";
+
+  interface Props {
+    value?: string;  // 格式: YYYY-MM-DD HH:mm:ss
+    placeholder?: string;
+    class?: string;
+    onchange?: (value: string) => void;
+  }
+
+  let { value = $bindable(""), placeholder = "选择日期和时间", class: className, onchange }: Props = $props();
+
+  let open = $state(false);
+  let selectedDate = $state<DateValue | undefined>(undefined);
+  let timeValue = $state("00:00");
+
+  // 从 value 初始化日期和时间
+  $effect(() => {
+    if (value) {
+      const [datePart, timePart] = value.split(" ");
+      if (datePart) {
+        const [year, month, day] = datePart.split("-").map(Number);
+        if (year && month && day) {
+          selectedDate = new CalendarDate(year, month, day);
+        }
+      }
+      if (timePart) {
+        timeValue = timePart.slice(0, 5); // HH:mm
+      }
+    }
+  });
+
+  // 格式化显示文本
+  function formatDisplayText(): string {
+    if (!selectedDate) return "";
+    const year = selectedDate.year;
+    const month = String(selectedDate.month).padStart(2, "0");
+    const day = String(selectedDate.day).padStart(2, "0");
+    return `${year}-${month}-${day} ${timeValue}`;
+  }
+
+  // 更新输出值
+  function updateValue() {
+    if (selectedDate) {
+      const year = selectedDate.year;
+      const month = String(selectedDate.month).padStart(2, "0");
+      const day = String(selectedDate.day).padStart(2, "0");
+      const newValue = `${year}-${month}-${day} ${timeValue}:00`;
+      value = newValue;
+      onchange?.(newValue);
+    }
+  }
+
+  // 日期选择处理
+  function handleDateSelect(date: DateValue | undefined) {
+    selectedDate = date;
+    updateValue();
+  }
+
+  // 时间变化处理
+  function handleTimeChange(e: Event) {
+    const target = e.target as HTMLInputElement;
+    timeValue = target.value;
+    updateValue();
+  }
+
+  // 设置当前时间
+  function setNow() {
+    const now = new Date();
+    selectedDate = new CalendarDate(now.getFullYear(), now.getMonth() + 1, now.getDate());
+    timeValue = `${String(now.getHours()).padStart(2, "0")}:${String(now.getMinutes()).padStart(2, "0")}`;
+    updateValue();
+  }
+
+  const displayText = $derived(formatDisplayText());
+</script>
+
+<Popover.Root bind:open>
+  <Popover.Trigger>
+    {#snippet child({ props })}
+      <Button
+        variant="outline"
+        class={cn(
+          "w-full justify-start text-left font-normal",
+          !selectedDate && "text-muted-foreground",
+          className
+        )}
+        {...props}
+      >
+        <CalendarIcon class="mr-2 h-4 w-4" />
+        {displayText || placeholder}
+        <ChevronDown class="ml-auto h-4 w-4 opacity-50" />
+      </Button>
+    {/snippet}
+  </Popover.Trigger>
+  <Popover.Portal>
+    <Popover.Content class="w-auto p-0" align="start">
+      <div class="p-3 space-y-3">
+        <Calendar
+          type="single"
+          value={selectedDate}
+          onValueChange={handleDateSelect}
+          captionLayout="dropdown"
+          locale="zh-CN"
+        />
+        <div class="border-t pt-3 px-1">
+          <div class="flex items-center gap-2">
+            <Clock class="h-4 w-4 text-muted-foreground" />
+            <span class="text-sm text-muted-foreground">时间</span>
+            <Input
+              type="time"
+              value={timeValue}
+              onchange={handleTimeChange}
+              class="flex-1 h-9"
+            />
+            <Button variant="outline" size="sm" onclick={setNow}>
+              现在
+            </Button>
+          </div>
+        </div>
+        <div class="border-t pt-3 flex justify-end">
+          <Button size="sm" onclick={() => (open = false)}>
+            确定
+          </Button>
+        </div>
+      </div>
+    </Popover.Content>
+  </Popover.Portal>
+</Popover.Root>

web/src/lib/components/ui/date-time-picker/index.ts

@@ -0,0 +1,3 @@
+import DateTimePicker from "./date-time-picker.svelte";
+
+export { DateTimePicker };

web/src/routes/bills/+page.svelte

@@ -483,6 +483,6 @@
 
   <!-- 手动添加视图 -->
   {#if activeTab === 'manual'}
-    <ManualBillInput {categories} onSuccess={handleManualBillSuccess} />
+    <ManualBillInput onSuccess={handleManualBillSuccess} />
   {/if}
 </div>