fix: 筛选面板删除X关闭按钮，底部加确认按钮点击后关闭

- 库存/区域/客户三个筛选面板移除X图标
- 底部增加"确认"按钮，点击后关闭面板
- 移除背景遮罩点击关闭，只能通过确认按钮关闭

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/App.tsx

@@ -1007,7 +1007,7 @@ export default function App() {
                 <AnimatePresence>
                   {isInventoryFilterOpen && (
                     <>
-                      <div className="fixed inset-0 z-40" onClick={() => setIsInventoryFilterOpen(false)} />
+                      <div className="fixed inset-0 z-40" />
                       <motion.div
                         initial={{ opacity: 0, y: 10, scale: 0.95 }}
                         animate={{ opacity: 1, y: 0, scale: 1 }}
@@ -1016,17 +1016,12 @@ export default function App() {
                       >
                         <div className="flex justify-between items-center mb-4">
                           <h3 className="text-xs font-bold text-slate-800">库存统计 - 数据筛选</h3>
-                          <div className="flex items-center gap-2">
                           <button
                             onClick={() => setInventoryFilters({ region: '', city: '', brand: '', batch: '', model: '' })}
                             className="text-[10px] text-blue-500 hover:underline"
                           >
                             重置所有
                           </button>
-                            <button onClick={() => setIsInventoryFilterOpen(false)} className="text-slate-400 hover:text-slate-600">
-                              <PlusCircle className="rotate-45" size={16} />
-                            </button>
-                          </div>
                         </div>
 
                         <div className="space-y-3 text-left">
@@ -1056,6 +1051,7 @@ export default function App() {
                             <SearchSelect value={inventoryFilters.model} onChange={(v) => setInventoryFilters({...inventoryFilters, model: v})} options={uniqueInventoryModels} placeholder="全部车型" />
                           </div>
                         </div>
+                        <button onClick={() => setIsInventoryFilterOpen(false)} className="w-full mt-4 py-2 bg-blue-600 text-white rounded-lg text-xs font-bold hover:bg-blue-700 transition-colors">确认</button>
                       </motion.div>
                     </>
                   )}
@@ -1914,7 +1910,7 @@ export default function App() {
               <AnimatePresence>
                 {isRegionFilterOpen && (
                   <>
-                    <div className="fixed inset-0 z-40" onClick={() => setIsRegionFilterOpen(false)} />
+                    <div className="fixed inset-0 z-40" />
                     <motion.div 
                       initial={{ opacity: 0, y: 10, scale: 0.95 }}
                       animate={{ opacity: 1, y: 0, scale: 1 }}
@@ -1923,17 +1919,12 @@ export default function App() {
                     >
                       <div className="flex items-center justify-between mb-4">
                         <h3 className="text-sm font-bold text-gray-900">区域筛选</h3>
-                        <div className="flex items-center gap-2">
                         <button
                           onClick={() => setRegionFilters({ region: '', city: '', customer: '' })}
                           className="text-[10px] text-slate-600 hover:text-slate-700 font-medium"
                         >
                           重置所有
                         </button>
-                          <button onClick={() => setIsRegionFilterOpen(false)} className="text-slate-400 hover:text-slate-600 sm:hidden">
-                            <PlusCircle className="rotate-45" size={16} />
-                          </button>
-                        </div>
                       </div>
 
                       <div className="space-y-4">
@@ -1959,7 +1950,7 @@ export default function App() {
                           </div>
                         </div>
                       </div>
-
+                      <button onClick={() => setIsRegionFilterOpen(false)} className="w-full mt-4 py-2 bg-slate-800 text-white rounded-lg text-xs font-bold hover:bg-slate-900 transition-colors">确认</button>
                     </motion.div>
                   </>
                 )}
@@ -2213,11 +2204,8 @@ export default function App() {
               <AnimatePresence>
                 {isCustomerFilterOpen && (
                   <>
-                    {/* Backdrop for closing */}
+                    {/* Backdrop */}
-                    <div 
+                    <div className="fixed inset-0 z-40" />
-                      className="fixed inset-0 z-40" 
-                      onClick={() => setIsCustomerFilterOpen(false)}
-                    />
                     
                     {/* Popover Content */}
                     <motion.div
@@ -2235,9 +2223,6 @@ export default function App() {
                           >
                             重置所有
                           </button>
-                          <button onClick={() => setIsCustomerFilterOpen(false)} className="text-slate-400 hover:text-slate-600 sm:hidden">
-                            <PlusCircle className="rotate-45" size={16} />
-                          </button>
                         </div>
                       </div>
 
@@ -2276,7 +2261,7 @@ export default function App() {
                           </div>
                         </div>
                       </div>
-
+                      <button onClick={() => setIsCustomerFilterOpen(false)} className="w-full mt-4 py-2 bg-emerald-600 text-white rounded-lg text-xs font-bold hover:bg-emerald-700 transition-colors">确认</button>
                     </motion.div>
                   </>
                 )}