fix(events): fix Ticketmaster URL encoding + add error logging

Colons in startDateTime were being percent-encoded which Ticketmaster
may reject. Also log errors/status so backend logs reveal the cause
when no events appear.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/novasonic-server.js

@@ -317,19 +317,23 @@ app.get('/api/itunes/:endpoint', (req, res) => {
 
 app.get('/api/events/:artist', (req, res) => {
   const key = CONFIG.ticketmasterKey;
-  if (!key) return res.json([]);
+  if (!key) { console.warn('[events] TICKETMASTER_API_KEY not set'); return res.json([]); }
   const artist = req.params.artist;
-  const now    = new Date().toISOString().replace(/\.\d{3}Z$/, 'Z');
+  const now    = new Date().toISOString().replace(/\.\d{3}Z$/, 'Z'); // 2024-06-08T12:00:00Z
   const url    = `https://app.ticketmaster.com/discovery/v2/events.json` +
     `?keyword=${encodeURIComponent(artist)}&classificationName=music` +
-    `&startDateTime=${encodeURIComponent(now)}&size=20&sort=date%2Casc` +
-    `&apikey=${encodeURIComponent(key)}`;
+    `&startDateTime=${now}&size=20&sort=date,asc` +
+    `&apikey=${key}`;
   https.get(url, { headers: { 'Accept': 'application/json' } }, upstream => {
     let body = '';
     upstream.on('data', d => body += d);
     upstream.on('end', () => {
       try {
         const data = JSON.parse(body);
+        if (upstream.statusCode !== 200 || data.fault || data.errors) {
+          console.error('[events] Ticketmaster error:', upstream.statusCode, JSON.stringify(data).slice(0, 200));
+          return res.json([]);
+        }
         const raw    = data?._embedded?.events || [];
         const events = raw.map(e => {
           const venue   = e._embedded?.venues?.[0] || {};
@@ -349,10 +353,11 @@ app.get('/api/events/:artist', (req, res) => {
             offers: e.url ? [{ url: e.url, status: soldOut ? 'unavailable' : 'available' }] : [],
           };
         }).filter(e => e.datetime);
+        console.log(`[events] ${artist}: ${events.length} events`);
         res.json(events);
-      } catch { res.json([]); }
+      } catch(err) { console.error('[events] parse error:', err); res.json([]); }
     });
-  }).on('error', () => res.json([]));
+  }).on('error', e => { console.error('[events] request error:', e.message); res.json([]); });
 });
 
 app.get('/api/health', (req, res) => {