feat: Add About and Favourites pages, update routing and context management

- Added new routes for About and Favourites pages.
- Implemented About page with version information and credits.
- Created Favourites page with a placeholder message for empty favourites.
- Refactored RegionConfig import paths for consistency.
- Introduced PageTitleContext to manage page titles dynamically.
- Updated various components to utilize the new context for setting page titles.
- Enhanced AppShell layout with a responsive Drawer for navigation.
- Added CSS styles for new components and pages.
- Integrated commit hash display in the About page for version tracking.

4 files changed, 98 insertions, 0 deletions

diff --git a/src/frontend/app/components/ui/Button.css b/src/frontend/app/components/ui/Button.css
new file mode 100644
index 0000000..bf02a7c
--- /dev/null
+++ b/src/frontend/app/components/ui/Button.css
@@ -0,0 +1,39 @@
+.ui-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.75rem 1.5rem;
+  border-radius: 0.5rem;
+  font-size: 0.9rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background-color 0.2s ease, transform 0.1s ease;
+  border: none;
+}
+
+.ui-button:active {
+  transform: translateY(1px);
+}
+
+.ui-button--primary {
+  background: var(--button-background-color);
+  color: white;
+}
+
+.ui-button--primary:hover {
+  background: var(--button-hover-background-color);
+}
+
+.ui-button--secondary {
+  background: var(--border-color);
+  color: var(--text-color);
+}
+
+.ui-button--secondary:hover {
+  background: #e0e0e0;
+}
+
+.ui-button__icon {
+  display: flex;
+  align-items: center;
+}
diff --git a/src/frontend/app/components/ui/Button.tsx b/src/frontend/app/components/ui/Button.tsx
new file mode 100644
index 0000000..18a15b2
--- /dev/null
+++ b/src/frontend/app/components/ui/Button.tsx
@@ -0,0 +1,25 @@
+import React from "react";
+import "./Button.css";
+
+interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  variant?: "primary" | "secondary" | "outline";
+  icon?: React.ReactNode;
+}
+
+export const Button: React.FC<ButtonProps> = ({
+  children,
+  variant = "primary",
+  icon,
+  className = "",
+  ...props
+}) => {
+  return (
+    <button
+      className={`ui-button ui-button--${variant} ${className}`}
+      {...props}
+    >
+      {icon && <span className="ui-button__icon">{icon}</span>}
+      {children}
+    </button>
+  );
+};
diff --git a/src/frontend/app/components/ui/PageContainer.css b/src/frontend/app/components/ui/PageContainer.css
new file mode 100644
index 0000000..8a86035
--- /dev/null
+++ b/src/frontend/app/components/ui/PageContainer.css
@@ -0,0 +1,20 @@
+.page-container {
+  max-width: 100%;
+  padding: 0 16px;
+  background-color: var(--background-color);
+  color: var(--text-color);
+}
+
+@media (min-width: 768px) {
+  .page-container {
+    width: 90%;
+    max-width: 768px;
+    margin: 0 auto;
+  }
+}
+
+@media (min-width: 1024px) {
+  .page-container {
+    max-width: 1024px;
+  }
+}
diff --git a/src/frontend/app/components/ui/PageContainer.tsx b/src/frontend/app/components/ui/PageContainer.tsx
new file mode 100644
index 0000000..4c9684a
--- /dev/null
+++ b/src/frontend/app/components/ui/PageContainer.tsx
@@ -0,0 +1,14 @@
+import React from "react";
+import "./PageContainer.css";
+
+interface PageContainerProps {
+  children: React.ReactNode;
+  className?: string;
+}
+
+export const PageContainer: React.FC<PageContainerProps> = ({
+  children,
+  className = "",
+}) => {
+  return <div className={`page-container ${className}`}>{children}</div>;
+};