feat: Implement Phase 3 modules

- Implements placeholder logic for the `agenda`, `citas`, `equipo`, `aprobaciones`, and `servicios` modules.
- Integrates all new module functions into the `button` handler in `app/main.py` to make the bot's menus functional.
- Fixes a newline formatting bug in the text responses to ensure they render correctly in Telegram.
- Updates `tasks.md` to reflect the progress on Phase 3.

app/main.py

@@ -6,6 +6,11 @@ from telegram.ext import Application, CommandHandler, CallbackQueryHandler, Cont
 from config import TELEGRAM_BOT_TOKEN
 from permissions import get_user_role
 from modules.onboarding import handle_start as onboarding_handle_start
+from modules.agenda import get_agenda
+from modules.citas import request_appointment
+from modules.equipo import propose_activity, view_requests_status
+from modules.aprobaciones import approve_request, view_pending
+from modules.servicios import get_service_info
 
 # Enable logging
 logging.basicConfig(
@@ -26,11 +31,30 @@ async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     await update.message.reply_text(response_text, reply_markup=reply_markup)
 
 async def button(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
-    """Parses the CallbackQuery and updates the message text."""
+    """Parses the CallbackQuery and calls the appropriate module."""
     query = update.callback_query
     await query.answer()
-    # TODO: Implement handlers for the different callback queries
-    await query.edit_message_text(text=f"Selected option: {query.data}")
+
+    logger.info(f"Received callback query: {query.data}")
+
+    response_text = "Acción no reconocida."
+
+    if query.data == 'view_agenda':
+        response_text = get_agenda()
+    elif query.data == 'view_pending':
+        response_text = view_pending()
+    elif query.data == 'approve_request':
+        response_text = approve_request()
+    elif query.data == 'propose_activity':
+        response_text = propose_activity()
+    elif query.data == 'view_requests_status':
+        response_text = view_requests_status()
+    elif query.data == 'schedule_appointment':
+        response_text = request_appointment()
+    elif query.data == 'get_service_info':
+        response_text = get_service_info()
+
+    await query.edit_message_text(text=response_text, parse_mode='Markdown')
 
 def main() -> None:
     """Start the bot."""