feat: add Open Graph image generation and SEO metadata

- Introduced `PageSeo` component for managing page metadata for social sharing.
- Created Open Graph image templates using SVG and static fonts for better visual representation.
- Implemented service alert management with functions to check active alerts and format route numbers.
- Added utility functions for generating and watching alert validity.
- Developed a script to generate Open Graph images dynamically based on page content.
- Included tests for service alert functionalities to ensure correctness and reliability.

pages/api/departures.ts

@@ -1,22 +1,21 @@
 import type { NextApiRequest, NextApiResponse } from 'next';
 import { createRideBusClient, parseRequest, RideBusError } from '@/lib/ridebus';
 
-const ridebus = createRideBusClient();
-
-export default async function departures(
-  req: NextApiRequest,
-  res: NextApiResponse
-) {
-  res.setHeader('Cache-Control', 'no-store');
-  if (req.method !== 'GET') {
-    res.setHeader('Allow', 'GET');
-    return res.status(405).json({ error: 'method_not_allowed' });
-  }
-  try {
-    return res.status(200).json(await ridebus.get(parseRequest(req.query)));
-  } catch (error) {
-    const status = error instanceof RideBusError ? error.status : 502;
-    // Never forward upstream responses or configuration details to the browser.
-    return res.status(status).json({ error: 'departures_unavailable' });
-  }
+export function createDeparturesHandler(ridebus = createRideBusClient()) {
+  return async function departures(req: NextApiRequest, res: NextApiResponse) {
+    res.setHeader('Cache-Control', 'no-store');
+    if (req.method !== 'GET') {
+      res.setHeader('Allow', 'GET');
+      return res.status(405).json({ error: 'method_not_allowed' });
+    }
+    try {
+      return res.status(200).json(await ridebus.get(parseRequest(req.query)));
+    } catch (error) {
+      const status = error instanceof RideBusError ? error.status : 502;
+      // Never forward upstream responses or configuration details to the browser.
+      return res.status(status).json({ error: 'departures_unavailable' });
+    }
+  };
 }
+
+export default createDeparturesHandler();