feat: add clear X button to all search inputs

src/components/HistoryView.tsx

@@ -1,5 +1,5 @@
 import React, { useState, useEffect } from 'react';
-import { History, RotateCcw, ChevronDown, ChevronRight, User, Calendar, Tag } from 'lucide-react';
+import { History, RotateCcw, ChevronDown, ChevronRight, User, Calendar, Tag, Search, X } from 'lucide-react';
 import { getHistory, deleteHistoryEntry, HistoryEntry } from '../lib/supabase';
 import { ExcelRow, COLUMNS } from '../types';
 import { cn } from '../lib/utils';
@@ -102,8 +102,16 @@ export function HistoryView({ headers, data, onRevert, sessionToken }: HistoryVi
               placeholder="Search history..."
               value={search}
               onChange={(e) => setSearch(e.target.value)}
-              className="pl-10 pr-4 py-2 bg-slate-800 border border-slate-700 rounded-md text-sm text-slate-200 focus:outline-none focus:border-blue-500 transition-colors w-64"
+              className="pl-10 pr-10 py-2 bg-slate-800 border border-slate-700 rounded-md text-sm text-slate-200 focus:outline-none focus:border-blue-500 transition-colors w-64"
             />
+            {search && (
+              <button
+                onClick={() => setSearch('')}
+                className="absolute right-3 top-1/2 -translate-y-1/2 text-slate-400 hover:text-white"
+              >
+                <X className="w-4 h-4" />
+              </button>
+            )}
           </div>
           <button 
             onClick={loadHistory}