fix: add global error handler to surface silent exceptions to user

src/main.py

@@ -1,15 +1,28 @@
+import logging
+from telegram import Update
 from telegram.ext import ApplicationBuilder, CommandHandler, MessageHandler, filters
 from config import TELEGRAM_BOT_TOKEN
 import database as db
 from handlers import admin as admin_handler
 from handlers import user as user_handler
 
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+async def error_handler(update: object, context) -> None:
+    logger.error("Exception saat handle update:", exc_info=context.error)
+    if isinstance(update, Update) and update.message:
+        await update.message.reply_text(f"❌ Terjadi kesalahan: {str(context.error)[:200]}")
+
 
 def main():
     db.init_db()
 
     app = ApplicationBuilder().token(TELEGRAM_BOT_TOKEN).build()
 
+    app.add_error_handler(error_handler)
+
     # --- User commands ---
     app.add_handler(CommandHandler("start", user_handler.start))
     app.add_handler(CommandHandler("remember", user_handler.remember))
@@ -27,18 +40,14 @@ def main():
     app.add_handler(CommandHandler("help_admin", admin_handler.help_admin))
 
     # --- Document upload via caption ---
-    # User: kirim file dengan caption "/upload"
     app.add_handler(MessageHandler(
         filters.Document.ALL & filters.CaptionRegex(r"^/upload$"),
         user_handler.upload_doc
     ))
-    # Admin: kirim file dengan caption "/upload_global"
     app.add_handler(MessageHandler(
         filters.Document.ALL & filters.CaptionRegex(r"^/upload_global$"),
         admin_handler.upload_global
     ))
-
-    # Fallback: dokumen tanpa caption yang valid
     app.add_handler(MessageHandler(filters.Document.ALL, user_handler.upload_doc))
 
     print("🤖 Second Brain Bot is running...")