Add manual stop creation and override alerts with alternate stop codes (#74)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: arielcostas <94913521+arielcostas@users.noreply.github.com>
Co-authored-by: Ariel Costas Guerrero <ariel@costas.dev>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/frontend/app/components/StopAlert.tsx b/src/frontend/app/components/StopAlert.tsx
new file mode 100644
index 0000000..69ecc22
--- /dev/null
+++ b/src/frontend/app/components/StopAlert.tsx
@@ -0,0 +1,36 @@
+import React from "react";
+import { AlertCircle, Info } from "lucide-react";
+import type { Stop } from "~/data/StopDataProvider";
+import "./StopAlert.css";
+
+interface StopAlertProps {
+  stop: Stop;
+  compact?: boolean;
+}
+
+export const StopAlert: React.FC<StopAlertProps> = ({ stop, compact = false }) => {
+  // Don't render anything if there's no alert content
+  const hasContent = stop.title || stop.message;
+  if (!hasContent) {
+    return null;
+  }
+
+  const isError = stop.cancelled === true;
+
+  return (
+    <div className={`stop-alert ${isError ? 'stop-alert-error' : 'stop-alert-info'} ${compact ? 'stop-alert-compact' : ''}`}>
+      <div className="stop-alert-icon">
+        {isError ? <AlertCircle /> : <Info />}
+      </div>
+      <div className="stop-alert-content">
+        {stop.title && <div className="stop-alert-title">{stop.title}</div>}
+        {stop.message && <div className="stop-alert-message">{stop.message}</div>}
+        {stop.alternateCodes && stop.alternateCodes.length > 0 && (
+          <div className="stop-alert-alternate-codes">
+            Alternative stops: {stop.alternateCodes.join(", ")}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};