Refactor DogList component and enhance type annotations in server app

Author: GeekTrainer

client/src/components/DogList.svelte

@@ -11,7 +11,7 @@
     let loading = true;
     let error: string | null = null;
 
-    async function fetchDogs() {
+    const fetchDogs = async () => {
         loading = true;
         try {
             const response = await fetch('/api/dogs');
@@ -25,7 +25,7 @@
         } finally {
             loading = false;
         }
-    }
+    };
 
     onMount(() => {
         fetchDogs();

server/app.py

@@ -1,20 +1,20 @@
-# filepath: server/app.py
 import os
-from flask import Flask, jsonify
+from typing import Dict, List, Any, Optional
+from flask import Flask, jsonify, Response
 from models import init_db, db, Dog, Breed
 
 # Get the server directory path
-base_dir = os.path.abspath(os.path.dirname(__file__))
+base_dir: str = os.path.abspath(os.path.dirname(__file__))
 
-app = Flask(__name__)
+app: Flask = Flask(__name__)
 app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{os.path.join(base_dir, "dogshelter.db")}'
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
 # Initialize the database with the app
 init_db(app)
 
 @app.route('/api/dogs', methods=['GET'])
-def get_dogs():
+def get_dogs() -> Response:
     query = db.session.query(
         Dog.id, 
         Dog.name, 
@@ -24,7 +24,7 @@ def get_dogs():
     dogs_query = query.all()
 
     # Convert the result to a list of dictionaries
-    dogs_list = [
+    dogs_list: List[Dict[str, Any]] = [
         {
             'id': dog.id,
             'name': dog.name,
@@ -36,7 +36,7 @@ def get_dogs():
     return jsonify(dogs_list)
 
 @app.route('/api/dogs/<int:id>', methods=['GET'])
-def get_dog(id):
+def get_dog(id: int) -> tuple[Response, int] | Response:
     # Query the specific dog by ID and join with breed to get breed name
     dog_query = db.session.query(
         Dog.id,
@@ -53,7 +53,7 @@ def get_dog(id):
         return jsonify({"error": "Dog not found"}), 404
 
     # Convert the result to a dictionary
-    dog = {
+    dog: Dict[str, Any] = {
         'id': dog_query.id,
         'name': dog_query.name,
         'breed': dog_query.breed,