P1: path routing, prerender shells, E2E, and HelmetProvider donate fix.

Replace hash URLs with path-based routing, post-build prerender for money pages, Playwright smoke tests, and wrap the app in HelmetProvider so /donate mounts correctly.

Co-authored-by: Cursor <[email protected]>

mim-api/src/server.js

@@ -198,8 +198,8 @@ app.post('/api/create-checkout-session', requireStripe, async (req, res) => {
   try {
     const session = await stripe.checkout.sessions.create({
       mode: recurring ? 'subscription' : 'payment',
-      success_url: `${PUBLIC_URL}/#/donate?status=success&session_id={CHECKOUT_SESSION_ID}`,
-      cancel_url: `${PUBLIC_URL}/#/donate?status=cancelled`,
+      success_url: `${PUBLIC_URL}/donate?status=success&session_id={CHECKOUT_SESSION_ID}`,
+      cancel_url: `${PUBLIC_URL}/donate?status=cancelled`,
       customer_email: email || undefined,
       line_items: [
         recurring