feat: implement period-over-period comparison in Ads tab

- AdsPerformance.tsx: Automatically activate comparison view when 2 periods are selected
- AdsPerformance.tsx: Add growth percentages and trend indicators to table and summary
- AdsPerformance.tsx: Implement chronological sorting for previous vs current periods
- App.tsx: Pass filters to AdsPerformance component

App.tsx

@@ -493,7 +493,7 @@ const App: React.FC = () => {
                 {view === 'table' && <DataGrid data={combinedAdsData} hasCustomerFilter={filters.customer.length > 0} adsData={filteredAdsData} />}
                 {view === 'weekly' && <WeeklyGrid data={combinedAdsData} top50Ranking={top50Ranking2025} />}
                 {view === 'movers' && <TopMovers data={filteredData} />}
-                {view === 'ads' && <AdsPerformance data={combinedAdsData} />}
+                {view === 'ads' && <AdsPerformance data={combinedAdsData} filters={filters} />}
               </Suspense>
             </div>
           </>