T15: buang voter basi di scan + hapus bobot suara & UI basi di web

get_voters.py kini menyimpan hanya pemilih segar (last_vote tak
diketahui atau > VEX_STALE_DAYS dibuang di normalize, V13). Web
menampilkan kolom RANK/AKUN/STAKE/VOTE TERAKHIR, tanpa BOBOT SUARA,
stat VOTE BASI, penanda/ filter ?stale=1 (V15). voters.db dipangkas
336 → 42. Oracle diperbarui dan lolos.

static/app.js

@@ -29,6 +29,13 @@
     });
   }
 
+  function shortdate(value) {
+    if (!value) {
+      return '—';
+    }
+    return String(value).slice(0, 10);
+  }
+
   function setSearchMode(on) {
     if (on && originalRows === null) {
       originalRows = rows.innerHTML;
@@ -53,7 +60,7 @@
           '<span class="rank">' + r.rank + '</span>' +
           '<span class="owner">' + escapeHtml(r.owner) + '</span>' +
           '<span class="stake" data-label="STAKE (VEX)">' + vex(r.staked) + '</span>' +
-          '<span class="weight" data-label="BOBOT SUARA">' + escapeHtml(r.weight) + '</span>' +
+          '<span class="vote-date" data-label="VOTE TERAKHIR">' + shortdate(r.last_vote) + '</span>' +
           '</div>';
       }).join('');
     }