feat: Enhance StopSheet component with error handling and loading states

- Added skeleton loading state to StopSheet for better UX during data fetch.
- Implemented error handling with descriptive messages for network and server errors.
- Introduced manual refresh functionality to reload stop estimates.
- Updated styles for loading and error states.
- Created StopSheetSkeleton and TimetableSkeleton components for consistent loading indicators.

feat: Improve StopList component with loading indicators and network data fetching

- Integrated loading state for StopList while fetching stops from the network.
- Added skeleton loading indicators for favourite and recent stops.
- Refactored data fetching logic to include favourite and recent stops with full data.
- Enhanced user experience with better loading and error handling.

feat: Update Timetable component with loading and error handling

- Added loading skeletons to Timetable for improved user experience.
- Implemented error handling for timetable data fetching.
- Refactored data loading logic to handle errors gracefully and provide retry options.

chore: Update package dependencies

- Upgraded react-router, lucide-react, and other dependencies to their latest versions.
- Updated types for TypeScript compatibility.

1 files changed, 82 insertions, 0 deletions

diff --git a/src/frontend/app/components/ErrorDisplay.css b/src/frontend/app/components/ErrorDisplay.css
new file mode 100644
index 0000000..096182a
--- /dev/null
+++ b/src/frontend/app/components/ErrorDisplay.css
@@ -0,0 +1,82 @@
+.error-display {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  padding: 2rem;
+  min-height: 200px;
+}
+
+.error-content {
+  text-align: center;
+  max-width: 400px;
+}
+
+.error-icon {
+  width: 48px;
+  height: 48px;
+  color: #e74c3c;
+  margin: 0 auto 1rem;
+  display: block;
+}
+
+.error-title {
+  font-size: 1.5rem;
+  font-weight: 600;
+  color: #2c3e50;
+  margin: 0 0 0.5rem;
+}
+
+.error-message {
+  color: #7f8c8d;
+  margin: 0 0 1.5rem;
+  line-height: 1.5;
+}
+
+.error-retry-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  background: #3498db;
+  color: white;
+  border: none;
+  padding: 0.75rem 1.5rem;
+  border-radius: 0.5rem;
+  font-size: 0.9rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: background-color 0.2s ease;
+}
+
+.error-retry-button:hover {
+  background: #2980b9;
+}
+
+.error-retry-button:active {
+  transform: translateY(1px);
+}
+
+.retry-icon {
+  width: 16px;
+  height: 16px;
+}
+
+/* Compact version for smaller spaces */
+.error-display.compact {
+  min-height: 120px;
+  padding: 1rem;
+}
+
+.error-display.compact .error-icon {
+  width: 32px;
+  height: 32px;
+  margin-bottom: 0.75rem;
+}
+
+.error-display.compact .error-title {
+  font-size: 1.2rem;
+}
+
+.error-display.compact .error-message {
+  font-size: 0.9rem;
+  margin-bottom: 1rem;
+}