Surface voice/photo processing errors instead of failing silently

The voice transcription and vision (photo) blocks in handleMessage
sat outside any try/catch. A thrown error (bad model id, Groq API
error, etc.) propagated past the code that replies to the user and
was only caught by the outer webhook handler, which returns JSON to
Supabase's gateway - never to Telegram. Users saw total silence with
no way to tell what went wrong. Now both paths catch their own
errors, reply to the user, and log the real cause.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: samasta-mahesh

supabase/functions/telegram-bot/index.ts

@@ -459,29 +459,39 @@ async function handleMessage(message: any) {
   if (message.text) {
     userMessage = message.text;
   } else if (message.voice) {
-    const fileUrl = await getTelegramFileUrl(message.voice.file_id);
-    const response = await fetch(fileUrl);
-    const buffer = await response.arrayBuffer();
-    const file = new File([buffer], "voice.ogg", { type: "audio/ogg" });
-    const transcription = await groq.audio.transcriptions.create({ file, model: "whisper-large-v3-turbo" });
-    userMessage = transcription.text;
+    try {
+      const fileUrl = await getTelegramFileUrl(message.voice.file_id);
+      const response = await fetch(fileUrl);
+      const buffer = await response.arrayBuffer();
+      const file = new File([buffer], "voice.ogg", { type: "audio/ogg" });
+      const transcription = await groq.audio.transcriptions.create({ file, model: "whisper-large-v3-turbo" });
+      userMessage = transcription.text;
+    } catch (err: any) {
+      console.error("Voice transcription error:", err);
+      return await sendTelegramMessage(chatId, "Sorry, I couldn't process that voice note: " + err.message);
+    }
   } else if (message.photo) {
-    const fileId = message.photo[message.photo.length - 1].file_id;
-    const fileUrl = await getTelegramFileUrl(fileId);
-    const response = await fetch(fileUrl);
-    const buffer = await response.arrayBuffer();
-    const base64 = btoa(String.fromCharCode(...new Uint8Array(buffer)));
-
-    const visionCompletion = await groq.chat.completions.create({
-      messages: [
-        { role: "user", content: [
-          { type: "text", text: `Extract any event details from this image. ${message.caption || ""}` },
-          { type: "image_url", image_url: { url: `data:image/jpeg;base64,${base64}` } },
-        ]},
-      ],
-      model: "qwen/qwen3.6-27b",
-    });
-    userMessage = visionCompletion.choices[0]?.message?.content || message.caption || "";
+    try {
+      const fileId = message.photo[message.photo.length - 1].file_id;
+      const fileUrl = await getTelegramFileUrl(fileId);
+      const response = await fetch(fileUrl);
+      const buffer = await response.arrayBuffer();
+      const base64 = btoa(String.fromCharCode(...new Uint8Array(buffer)));
+
+      const visionCompletion = await groq.chat.completions.create({
+        messages: [
+          { role: "user", content: [
+            { type: "text", text: `Extract any event details from this image. ${message.caption || ""}` },
+            { type: "image_url", image_url: { url: `data:image/jpeg;base64,${base64}` } },
+          ]},
+        ],
+        model: "qwen/qwen3.6-27b",
+      });
+      userMessage = visionCompletion.choices[0]?.message?.content || message.caption || "";
+    } catch (err: any) {
+      console.error("Vision processing error:", err);
+      return await sendTelegramMessage(chatId, "Sorry, I couldn't process that image: " + err.message);
+    }
   }
 
   if (!userMessage.trim()) return;