fix(02-03): fix upload file selection — pass abs path to refreshFileList

- Options use /app/shows/filename as value
- Upload response returns /app/shows/filename as path
- Pass path directly to refreshFileList so pre-selection matches

lightsync/frontend/app.js

@@ -272,19 +272,8 @@ document.getElementById('audio-upload')?.addEventListener('change', async (e) =>
         if (beats && beats.beats) {
             beatTimestamps = beats.beats;
         }
-        await refreshFileList(`/shows/${path.split('/').pop()}`);
-        // Auto-select and load the just-uploaded file
-        const sel = document.getElementById('audio-select');
-        const serverPath = `/shows/${path.split('/').pop()}`;
-        if (sel) {
-            // find matching option and select it
-            for (const opt of sel.options) {
-                if (opt.value === serverPath || opt.value === path) {
-                    opt.selected = true;
-                    break;
-                }
-            }
-        }
+        // Options use /app/shows/filename as value — pass abs path to pre-select
+        await refreshFileList(path);
         loadSelectedFile(path);
     } catch (err) {
         console.error('[audio] upload error:', err);