feat: Mail infinite scroll, remove sort header + pagination, connect filter/sort to MailList

frontend/src/components/mail/MailList.tsx

@@ -1,17 +1,15 @@
 /**
- * Mail list component with pagination and virtual scrolling.
- * Shows list of mails in selected folder with seen/flagged indicators.
+ * Mail list component with infinite scroll.
+ * No pagination, no sort header — sorting is in toolbar SortPanel.
  */
 
-import React, { useRef } from 'react';
+import React, { useRef, useEffect } from 'react';
 import clsx from 'clsx';
 import { useTranslation } from 'react-i18next';
-import { useVirtualizer } from '@tanstack/react-virtual';
 import type { Mail } from '@/api/mail';
 import { decodeMimeHeader } from '@/api/mail';
 import { EmptyState } from '@/components/ui/EmptyState';
-import { Pagination } from '@/components/ui/Pagination';
-import { ChevronUp, Loader2, Paperclip, Star } from 'lucide-react';
+import { Loader2, Paperclip, Star } from 'lucide-react';
 import { formatSmartDate } from '@/utils/date';
 
 export interface MailListProps {
@@ -19,16 +17,11 @@ export interface MailListProps {
   selectedMailId: string | null;
   onSelectMail: (mail: Mail) => void;
   loading: boolean;
-  currentPage: number;
-  total: number;
-  pageSize: number;
-  onPageChange: (page: number) => void;
   selectedMailIds: Set<string>;
   onToggleSelect: (mailId: string) => void;
   onSelectAll: () => void;
-  sortBy?: 'date' | 'from' | 'subject';
-  sortOrder?: 'asc' | 'desc';
-  onSortChange?: (sortBy: 'date' | 'from' | 'subject', sortOrder: 'asc' | 'desc') => void;
+  onLoadMore?: () => void;
+  hasMore?: boolean;
 }
 
 function formatDate(dateStr: string): string {
@@ -40,44 +33,25 @@ export function MailList({
   selectedMailId,
   onSelectMail,
   loading,
-  currentPage,
-  total,
-  pageSize,
-  onPageChange,
   selectedMailIds,
   onToggleSelect,
   onSelectAll,
-  sortBy = 'date',
-  sortOrder = 'desc',
-  onSortChange,
+  onLoadMore,
+  hasMore = false,
 }: MailListProps) {
   const { t } = useTranslation();
-  const totalPages = Math.ceil(total / pageSize);
   const allSelected = mails.length > 0 && mails.every((m) => selectedMailIds.has(m.id));
   const scrollRef = useRef<HTMLUListElement>(null);
 
-  // Auto-skip virtualization for small datasets
-  const shouldVirtualize = mails.length >= 50;
-
-  const rowVirtualizer = useVirtualizer({
-    count: shouldVirtualize ? mails.length : 0,
-    getScrollElement: () => scrollRef.current,
-    estimateSize: () => 80, // approx mail item height
-    overscan: 8,
-    enabled: shouldVirtualize,
-  });
-
-  const handleSortFieldChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
-    const newSortBy = e.target.value as 'date' | 'from' | 'subject';
-    onSortChange?.(newSortBy, sortOrder);
+  // Infinite scroll handler
+  const handleScroll = (e: React.UIEvent<HTMLUListElement>) => {
+    const el = e.currentTarget;
+    if (el.scrollTop + el.clientHeight >= el.scrollHeight - 200 && onLoadMore && !loading && hasMore) {
+      onLoadMore();
+    }
   };
 
-  const handleSortOrderToggle = () => {
-    const newOrder = sortOrder === 'asc' ? 'desc' : 'asc';
-    onSortChange?.(sortBy, newOrder);
-  };
-
-  if (loading) {
+  if (loading && mails.length === 0) {
     return (
       <div className="flex items-center justify-center py-12" data-testid="mail-list-loading">
         <Loader2 className="animate-spin h-5 w-5 text-secondary-400" aria-hidden="true" />
@@ -97,7 +71,7 @@ export function MailList({
   }
 
   const renderMailItem = (mail: Mail) => (
-    <li key={mail.id} role="listitem" className={clsx(selectedMailIds.has(mail.id) && 'bg-primary-50')}>
+    <li key={mail.id} role="listitem" className={clsx('divide-y divide-secondary-100', selectedMailIds.has(mail.id) && 'bg-primary-50')}>
       <div className="flex items-start gap-2">
         <div className="flex items-center pt-3 pl-3 md:pl-4">
           <input
@@ -167,7 +141,7 @@ export function MailList({
 
   return (
     <div className="flex flex-col h-full" data-testid="mail-list" role="listbox" aria-label={t('mail.selectMail')}>
-      {/* Select-all + Sort header in one row */}
+      {/* Select-all header — no sort controls (sorting is in toolbar) */}
       <div className="flex items-center justify-between gap-2 px-3 py-2 md:px-4 md:py-2 border-b border-secondary-200 bg-secondary-50 flex-shrink-0">
         <div className="flex items-center gap-2">
           <input
@@ -184,87 +158,24 @@ export function MailList({
             </span>
           )}
         </div>
-        {onSortChange && (
-          <div className="flex items-center gap-2" data-testid="mail-sort-bar">
-            <label htmlFor="mail-sort-by" className="text-xs text-secondary-600">
-              {t('mail.sortBy')}:
-            </label>
-            <select
-              id="mail-sort-by"
-              value={sortBy}
-              onChange={handleSortFieldChange}
-              className="text-xs rounded border border-secondary-300 bg-white px-1.5 py-0.5 text-secondary-700 focus:outline-none focus:ring-1 focus:ring-primary-500"
-              aria-label={t('mail.sortBy')}
-              data-testid="mail-sort-by"
-            >
-              <option value="date">{t('mail.sortDate')}</option>
-              <option value="from">{t('mail.sortFrom')}</option>
-              <option value="subject">{t('mail.sortSubject')}</option>
-            </select>
-            <button
-              onClick={handleSortOrderToggle}
-              className="inline-flex items-center gap-1 text-xs rounded border border-secondary-300 bg-white px-1.5 py-0.5 text-secondary-700 hover:bg-secondary-100 focus:outline-none focus:ring-1 focus:ring-primary-500"
-              aria-label={sortOrder === 'asc' ? t('mail.sortAsc') : t('mail.sortDesc')}
-              title={sortOrder === 'asc' ? t('mail.sortAsc') : t('mail.sortDesc')}
-              data-testid="mail-sort-order"
-            >
-              <ChevronUp className="w-3 h-3" aria-hidden="true" strokeWidth={2} />
-              <span>{sortOrder === 'asc' ? t('mail.sortAsc') : t('mail.sortDesc')}</span>
-            </button>
-          </div>
-        )}
+        {loading && mails.length > 0 && <Loader2 className="w-4 h-4 animate-spin text-secondary-400" />}
       </div>
-      {/* Mail list — scrolls, pagination stays fixed */}
-      {shouldVirtualize ? (
-        <ul
-          ref={scrollRef}
-          className="divide-y divide-secondary-100 flex-1 overflow-y-auto"
-          role="list"
-          style={{ contain: 'strict' }}
-        >
-          <li
-            key="__virtual-spacer"
-            style={{
-              height: rowVirtualizer.getTotalSize(),
-              position: 'relative',
-              width: '100%',
-            }}
-          >
-            {rowVirtualizer.getVirtualItems().map((virtualRow) => {
-              const mail = mails[virtualRow.index];
-              return (
-                <div
-                  key={mail.id}
-                  style={{
-                    position: 'absolute',
-                    top: 0,
-                    left: 0,
-                    width: '100%',
-                    transform: `translateY(${virtualRow.start}px)`,
-                  }}
-                >
-                  {renderMailItem(mail)}
-                </div>
-              );
-            })}
+
+      {/* Mail list — infinite scroll, no pagination */}
+      <ul
+        ref={scrollRef}
+        className="divide-y divide-secondary-100 flex-1 overflow-y-auto"
+        role="list"
+        data-testid="mail-list-items"
+        onScroll={handleScroll}
+      >
+        {mails.map((mail) => renderMailItem(mail))}
+        {loading && mails.length > 0 && (
+          <li className="flex items-center justify-center py-4">
+            <Loader2 className="w-5 h-5 animate-spin text-secondary-400" />
           </li>
-        </ul>
-      ) : (
-        <ul className="divide-y divide-secondary-100 flex-1 overflow-y-auto" role="list">
-          {mails.map((mail) => renderMailItem(mail))}
-        </ul>
-      )}
-      {totalPages > 1 && (
-        <div className="flex-shrink-0">
-          <Pagination
-            currentPage={currentPage}
-            totalPages={totalPages}
-            total={total}
-            pageSize={pageSize}
-            onPageChange={onPageChange}
-          />
-        </div>
-      )}
+        )}
+      </ul>
     </div>
   );
 }