Enhance error handling and user experience in AI-related features

- Introduced a mechanism to save partially generated responses in case of errors, ensuring users do not lose their input.
- Updated the RevizyonKutusu component to utilize a persistent request ID for retrying failed requests without double charging credits.
- Improved the Sayfalama component to support client-side pagination without changing the URL, enhancing user navigation.
- Added a timeout for AI generation requests to ensure credits are refunded in case of prolonged processing.
- Refactored various components for better clarity and responsiveness, including updates to the BolumProgramListesi and ListePaneli components.

src/app/api/soru/route.ts

@@ -247,9 +247,9 @@ export async function POST(request: NextRequest) {
   const readable = new ReadableStream({
     async start(controller) {
       let tamamlandi = false;
+      let metin = "";
       try {
         // Sağlayıcıya bağlanma hatası da ilk parçada burada yakalanır
-        let metin = "";
         for await (const parca of sohbetAkisi({
           system,
           mesajlar,
@@ -269,7 +269,20 @@ export async function POST(request: NextRequest) {
         controller.close();
       } catch (err) {
         if (!tamamlandi) {
-          // Hiç çıktı üretilmeden hata olduysa krediyi iade et
+          // Cevap tamamlanmadı: kredi iade edilir. Yarıda kalan metin varsa
+          // yine de kaydedilir ki kullanıcı ekranda gördüğü kısmı sayfa
+          // yenilenince kaybetmesin.
+          if (metin) {
+            try {
+              await appDb.insert(schema.chatMessages).values({
+                id: crypto.randomUUID(),
+                userId,
+                role: "assistant",
+                content: metin,
+                createdAt: new Date(),
+              });
+            } catch {}
+          }
           await grantCredits({
             userId,
             delta: 1,