Functional login and logout, login system should be fucntionally implemented.

Testing and polishing are next.

app/templates/dashboard.html

@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Dashboard</title>
+</head>
+
+<body>
+
+    <nav>
+        <a href="{{ url_for('main.dashboard') }}">Dashboard</a>
+        <a href="{{ url_for('login.logout') }}">Logout</a>
+    </nav>
+
+    <div class="container">
+
+        ```
+        <h1>Dashboard</h1>
+
+        <p>Welcome back <strong>{{ current_user.username }}</strong> 👋</p>
+
+        <div class="user-info">
+            <h3>Your Account</h3>
+
+            <p><strong>User ID:</strong> {{ current_user.id }}</p>
+            <p><strong>Username:</strong> {{ current_user.username }}</p>
+
+            {% if current_user.email %}
+            <p><strong>Email:</strong> {{ current_user.email }}</p>
+            {% else %}
+            <p><strong>Email:</strong> Not set</p>
+            {% endif %}
+
+            <p><strong>Account created:</strong> {{ current_user.created_at }}</p>
+        </div>
+
+        <div class="logout">
+            <form action="{{ url_for('login.logout') }}" method="post">
+                <button type="submit">Logout</button>
+            </form>
+        </div>
+        ```
+
+    </div>
+
+</body>
+
+</html>

app/templates/index.html

@@ -27,7 +27,7 @@
                 <a href="/dashboard">Dashboard</a>
                 <a href="/logout">Logout</a>
                 {% else %}
-                <a href="/login">Login</a>
+                <a href="{{ url_for('login.login') }}">Login</a>
                 {% endif %}
             </nav>
         </div>

app/templates/login.html

@@ -19,8 +19,8 @@
 <body>
     <nav>
         <ul>
-            <li><a href="/login">Login</a></li>
-            <li><a href="/register">Create account</a></li>
+            <li><a href="{{ url_for('login.login') }}">Login</a></li>
+            <li><a href="{{ url_for('login.register') }}">Create account</a></li>
         </ul>
     </nav>
     <h1>Login to your account</h1>
@@ -29,7 +29,7 @@
     <p class="error">{{ error }}</p>
     {% endif %}
 
-    <form action="/login" method="post">
+    <form action="{{ url_for('login.login') }}" method="post">
         <label for="username">Username:</label>
         <input type="text" name="username" required />
         <label for="password">Password:</label>

app/templates/sign_up.html

@@ -19,8 +19,8 @@
 <body>
     <nav>
         <ul>
-            <li><a href="/login">Login</a></li>
-            <li><a href="/register">Create account</a></li>
+            <li><a href="{{ url_for('login.login') }}">Login</a></li>
+            <li><a href="{{ url_for('login.register') }}">Create account</a></li>
         </ul>
     </nav>
     <h1>Create an account</h1>
@@ -29,7 +29,7 @@
     <p class="error">{{ error }}</p>
     {% endif %}
 
-    <form action="/register" method="post">
+    <form action="{{ url_for('login.register') }}" method="post">
         <label for="username">Username:</label>
         <input type="text" name="username" required />
         <label for="password">Password:</label>