shared push token support

review.html

@@ -76,9 +76,17 @@ footer .sp { flex: 1; }
   <button id="hubBtn" onclick="exp()">export</button>
 </footer>
 <script>
-let SINK = null, HFFUSER = null;
+let SINK = null, HFFUSER = null, SHAREDTOK = null;
 fetch('./sink.json').then(r => r.ok ? r.json() : null).then(async j => {
-  if (!j || !j.url) return;
+  if (!j) return;
+  // Optional shared push token (see README: public repo = public token,
+  // scope it to data-use-annotations writes only, rotate after the round).
+  if (j.pushToken) {
+    SHAREDTOK = j.pushToken;
+    const h = $('hubtok');
+    if (h) h.style.display = 'none';
+  }
+  if (!j.url) return;
   SINK = j.url.replace(/\/$/, '');
   paintLogin();
   try {
@@ -300,9 +308,10 @@ async function sinkCommit(entry) {
   return hubCommit(entry);
 }
 async function hubCommit(entry) {
-  // static hosting has no ruling sink: commit straight to the public
-  // dataset with the annotator's own write token (stored locally only).
-  const tok = ($('hubtok').value || '').trim();
+  // commit straight to the public dataset: personal token first,
+  // else the shared push token from sink.json (public repo = public
+  // token: scope it to data-use-annotations writes only).
+  const tok = ($('hubtok').value || '').trim() || SHAREDTOK || '';
   if (!tok) return 'this browser only (add HF token to sync)';
   try {
     const repo = 'rafmacalaba/data-use-annotations';
@@ -328,8 +337,8 @@ async function pushAll() {
   // one read, merge every local ruling, one commit to your own file.
   // use after pasting your token, or to retry anything saved locally only.
   if (needName()) return;
-  const tok = ($('hubtok').value || '').trim();
-  if (!tok) { $('mine').textContent = 'paste your HF write token first (footer field)'; $('hubtok').focus(); return; }
+  const tok = ($('hubtok').value || '').trim() || SHAREDTOK || '';
+  if (!tok) { $('mine').textContent = 'push unavailable — no shared token configured'; return; }
   const btn = $('pushBtn');
   btn.disabled = true;
   try {