feat(web): AI 工作台附件改为卡片化展示并支持单项移除

- PersonalWorkbenchAiMode 附件区由计数条改为按类型图标/名称/类型标签的卡片列表，支持单项移除（removeAiModeFile），复用 buildFileIdentity 作为 key
- resolveAiComposerFileType 按 pdf/图片/表格/文档/压缩包/文件归类，分别对应图标与色调
- .gitignore 补充忽略 server/storage/receipt_folder/ 运行时票据存储目录

web/src/components/business/PersonalWorkbenchAiMode.vue

@@ -175,9 +175,25 @@
           </div>
         </form>
 
-        <div v-if="selectedFiles.length" class="workbench-ai-file-strip">
-          <span>已选择 {{ selectedFiles.length }} 份附件</span>
-          <button type="button" :disabled="isAiModeInputLocked" @click="clearAiModeFiles">清空</button>
+        <div v-if="selectedFileCards.length" class="workbench-ai-file-strip" aria-label="已选择附件">
+          <article v-for="file in selectedFileCards" :key="file.key" class="workbench-ai-file-card">
+            <span class="workbench-ai-file-card__icon" :class="`type-${file.tone}`" aria-hidden="true">
+              <i :class="file.icon"></i>
+            </span>
+            <span class="workbench-ai-file-card__body">
+              <strong :title="file.name">{{ file.name }}</strong>
+              <small>{{ file.typeLabel }}</small>
+            </span>
+            <button
+              type="button"
+              class="workbench-ai-file-card__remove"
+              :disabled="isAiModeInputLocked"
+              :aria-label="`移除附件 ${file.name}`"
+              @click="removeAiModeFile(file.key)"
+            >
+              <i class="mdi mdi-close"></i>
+            </button>
+          </article>
         </div>
 
         <div class="workbench-ai-quick-start-section">
@@ -469,9 +485,25 @@
         </div>
 
         <div class="workbench-ai-conversation-bottom">
-          <div v-if="selectedFiles.length" class="workbench-ai-file-strip inline">
-            <span>已选择 {{ selectedFiles.length }} 份附件</span>
-            <button type="button" :disabled="isAiModeInputLocked" @click="clearAiModeFiles">清空</button>
+          <div v-if="selectedFileCards.length" class="workbench-ai-file-strip inline" aria-label="已选择附件">
+            <article v-for="file in selectedFileCards" :key="file.key" class="workbench-ai-file-card">
+              <span class="workbench-ai-file-card__icon" :class="`type-${file.tone}`" aria-hidden="true">
+                <i :class="file.icon"></i>
+              </span>
+              <span class="workbench-ai-file-card__body">
+                <strong :title="file.name">{{ file.name }}</strong>
+                <small>{{ file.typeLabel }}</small>
+              </span>
+              <button
+                type="button"
+                class="workbench-ai-file-card__remove"
+                :disabled="isAiModeInputLocked"
+                :aria-label="`移除附件 ${file.name}`"
+                @click="removeAiModeFile(file.key)"
+              >
+                <i class="mdi mdi-close"></i>
+              </button>
+            </article>
           </div>
 
           <form class="workbench-ai-composer workbench-ai-composer--inline" @submit.prevent="submitAiModePrompt">
@@ -742,6 +774,7 @@ import {
   buildRequiredApplicationSelectionText,
   filterRequiredApplicationCandidates
 } from '../../views/scripts/travelReimbursementApplicationLinkModel.js'
+import { buildFileIdentity } from '../../views/scripts/travelReimbursementAttachmentModel.js'
 import {
   calculateTravelReimbursement,
   extractExpenseClaimItems,
@@ -787,6 +820,14 @@ const INLINE_ANSWER_STREAM_CHUNK_SIZE = 6
 const INLINE_ANSWER_STREAM_DELAY_MS = 24
 const INLINE_AUTO_SCROLL_THRESHOLD = 96
 const INLINE_LAYOUT_SETTLE_SCROLL_DELAY_MS = 260
+const AI_COMPOSER_FILE_TYPE_META = {
+  pdf: { label: 'PDF', icon: 'mdi mdi-file-pdf-box', tone: 'pdf' },
+  image: { label: '图片', icon: 'mdi mdi-file-image-outline', tone: 'image' },
+  spreadsheet: { label: '表格', icon: 'mdi mdi-file-excel-outline', tone: 'spreadsheet' },
+  document: { label: '文档', icon: 'mdi mdi-file-document-outline', tone: 'document' },
+  archive: { label: '压缩包', icon: 'mdi mdi-folder-zip-outline', tone: 'archive' },
+  file: { label: '文件', icon: 'mdi mdi-file-outline', tone: 'file' }
+}
 const {
   applicationPreviewEditor,
   resolveApplicationPreviewEditorControl,
@@ -854,6 +895,12 @@ const aiModeActionItems = [
   }
 ]
 
+const selectedFileCards = computed(() => selectedFiles.value.map((file) => ({
+  key: buildFileIdentity(file),
+  name: resolveAiComposerFileName(file),
+  ...resolveAiComposerFileType(file)
+})))
+
 const displayUserName = computed(() => {
   const user = currentUser.value || {}
   return String(user.name || user.username || '同事').trim() || '同事'
@@ -2815,6 +2862,32 @@ function markInlineMessageFeedback(message, feedback) {
   toast(feedback === 'up' ? '已记录有帮助反馈。' : '已记录需要改进反馈。')
 }
 
+function resolveAiComposerFileName(file) {
+  return String(file?.name || '未命名附件').trim() || '未命名附件'
+}
+
+function resolveAiComposerFileType(file) {
+  const fileName = resolveAiComposerFileName(file).toLowerCase()
+  const mimeType = String(file?.type || '').toLowerCase()
+  const extension = fileName.includes('.') ? fileName.split('.').pop() : ''
+  if (extension === 'pdf' || mimeType.includes('pdf')) {
+    return AI_COMPOSER_FILE_TYPE_META.pdf
+  }
+  if (/^(png|jpe?g|gif|webp|bmp|svg|heic)$/.test(extension) || mimeType.startsWith('image/')) {
+    return AI_COMPOSER_FILE_TYPE_META.image
+  }
+  if (/^(xls|xlsx|csv|numbers)$/.test(extension) || mimeType.includes('spreadsheet') || mimeType.includes('excel')) {
+    return AI_COMPOSER_FILE_TYPE_META.spreadsheet
+  }
+  if (/^(doc|docx|txt|md|pages)$/.test(extension) || mimeType.includes('word') || mimeType.includes('text')) {
+    return AI_COMPOSER_FILE_TYPE_META.document
+  }
+  if (/^(zip|rar|7z|tar|gz)$/.test(extension) || mimeType.includes('zip') || mimeType.includes('compressed')) {
+    return AI_COMPOSER_FILE_TYPE_META.archive
+  }
+  return AI_COMPOSER_FILE_TYPE_META.file
+}
+
 function triggerAiModeFileUpload() {
   if (isAiModeInputLocked.value) {
     toast('请等待费用测算完成后再继续操作。')
@@ -2831,6 +2904,14 @@ function handleAiModeFilesChange(event) {
   focusAiModeInput()
 }
 
+function removeAiModeFile(fileKey) {
+  selectedFiles.value = selectedFiles.value.filter((file) => buildFileIdentity(file) !== fileKey)
+  if (!selectedFiles.value.length && fileInputRef.value) {
+    fileInputRef.value.value = ''
+  }
+  focusAiModeInput()
+}
+
 function clearAiModeFiles() {
   selectedFiles.value = []
   if (fileInputRef.value) {