Fix: Set isLoggedIn state and handle redirects

This commit addresses several issues related to the login flow:

- Corrects the `isLoggedIn` variable to use `setIsLoggedIn` in `App.jsx`.
- Passes `onLogin` and `isLoggedIn` props to `CampfireAppBar`.
- Enables logout functionality in `AppBar.jsx`.
- Modifies `AppRoutes.jsx` to conditionally render `CampfireAppBar`.
- Converts pages to use `React.forwardRef` for page transitions.
- Fixes the `useState` import in `App.jsx`.
- Moves `NotificationGroup` to the top of the form in `LoginComponent.jsx` to prevent overlap.
- Corrects the logo path in `LoginPage.jsx`.
- Improves input accessibility with a border in `LoginComponent.jsx`.

src/assets/css/index.css

@@ -0,0 +1,93 @@
+:root {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}
+
+.page-enter {
+  opacity: 0;
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+}
+.page-enter-active {
+  opacity: 1;
+  transition: opacity 300ms;
+}
+.page-exit {
+  opacity: 1;
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+}
+.page-exit-active {
+  opacity: 0;
+  transition: opacity 300ms;
+}