Polish: npm test runs every test file, two silent failures now log, Loading placeholders shimmer

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/store-view.js

@@ -136,7 +136,7 @@ function stPickFile() {
     const el = openSheet('Choose a file from Files', '', '<div id="stpk"></div>'); const finish = v => { done = true; closeSheet(); resolve(v); };
     el.querySelector('.scrim').addEventListener('click', () => { if (!done) resolve(null); });
     const draw = async () => {
-      const box = el.querySelector('#stpk'); box.innerHTML = '<p class="empty">Loading…</p>';
+      const box = el.querySelector('#stpk'); box.innerHTML = '<p class="empty loading" role="status">Loading…</p>';
       try {
         if (!repo) { const repos = (await sf.req('/api2/repos/')).filter(r => !r.encrypted).sort((a, b) => a.name.localeCompare(b.name));
           box.innerHTML = `<div class="list" style="max-height:50dvh;overflow:auto">${repos.map(r => `<button class="row" data-r="${esc(r.id)}">${icon('files')}<span class="grow"><b>${esc(r.name)}</b></span></button>`).join('')}</div><div class="bar"><button class="btn ghost" id="pcx" style="flex:1;justify-content:center">Cancel</button></div>`;