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/modules/equipo.py

@@ -1,9 +1,15 @@
 # app/modules/equipo.py
 
-def request_activity(chat_id, activity_details):
+def propose_activity():
     """
-    Handles a team member's request for an activity.
+    Handles a team member's request to propose an activity.
     """
-    print(f"[{chat_id}] Requesting activity: {activity_details}")
-    # TODO: Implement team activity request logic
-    return "Your activity request has been sent for approval."
+    # TODO: Implement the full workflow for proposing an activity
+    return "Estás a punto de proponer una actividad. Por favor, describe la actividad, su duración y el objetivo."
+
+def view_requests_status():
+    """
+    Allows a team member to see the status of their requests.
+    """
+    # TODO: Fetch the status of recent requests
+    return "Aquí está el estado de tus solicitudes recientes:\n\n- Grabación de proyecto (4h): Aprobado\n- Taller de guion (2h): Pendiente"