dashboard: approval history tab on P3NDING APPR0VALS

new tabs above the approvals list: 'pending · N' and
'history · M'. active tab persists in localStorage so the
operator can park on history if they prefer. on a fresh
dashboard the default is pending (matches the prior shape).

history view shows the last 30 resolved approvals — newest
first by resolved_at — with one row per approval: status
glyph (✓ approved / ✗ denied / ⚠ failed), id, agent, kind,
short sha, status label, and a relative time chip. when the
row has a note (deny reason or build error), it renders
below in a muted block with line wraps preserved.

backend: Approvals::recent_resolved(limit) queries by
status IN ('approved', 'denied', 'failed') ORDER BY
resolved_at DESC. StateSnapshot gets approval_history (a
lean ApprovalHistoryView without diff_html — rendering 30
git diffs per state poll would be expensive and the operator
already saw the diff at decision time). dashboard's
history_view fn projects the sqlite row.

retires the matching TODO entry.

hive-c0re/assets/app.js

@@ -601,6 +601,7 @@
     root.append(ul);
   }
 
+  const APPROVAL_TAB_KEY = 'hyperhive:approvals:tab';
   function renderApprovals(s) {
     const root = $('approvals-section');
     root.innerHTML = '';
@@ -622,6 +623,41 @@
     );
     root.append(spawn);
 
+    const history = s.approval_history || [];
+    const active = localStorage.getItem(APPROVAL_TAB_KEY) || 'pending';
+    const tabs = el('div', { class: 'approval-tabs' });
+    const pendingTab = el(
+      'button',
+      {
+        type: 'button',
+        class: 'approval-tab' + (active === 'pending' ? ' active' : ''),
+      },
+      `pending · ${s.approvals.length}`,
+    );
+    const historyTab = el(
+      'button',
+      {
+        type: 'button',
+        class: 'approval-tab' + (active === 'history' ? ' active' : ''),
+      },
+      `history · ${history.length}`,
+    );
+    pendingTab.addEventListener('click', () => {
+      localStorage.setItem(APPROVAL_TAB_KEY, 'pending');
+      renderApprovals(s);
+    });
+    historyTab.addEventListener('click', () => {
+      localStorage.setItem(APPROVAL_TAB_KEY, 'history');
+      renderApprovals(s);
+    });
+    tabs.append(pendingTab, historyTab);
+    root.append(tabs);
+
+    if (active === 'history') {
+      renderApprovalHistory(root, history);
+      return;
+    }
+
     if (!s.approvals.length) {
       root.append(el('p', { class: 'empty' }, 'queue empty'));
       return;
@@ -681,6 +717,49 @@
     root.append(ul);
   }
 
+  function renderApprovalHistory(root, history) {
+    if (!history.length) {
+      root.append(el('p', { class: 'empty' }, 'no resolved approvals yet'));
+      return;
+    }
+    const ul = el('ul', { class: 'approvals approvals-history' });
+    for (const a of history) {
+      const li = el('li');
+      const row = el('div', { class: 'row' });
+      const glyph = a.status === 'approved' ? '✓'
+        : a.status === 'denied' ? '✗'
+        : '⚠';
+      row.append(
+        el('span', { class: 'glyph glyph-' + a.status }, glyph), ' ',
+        el('span', { class: 'id' }, '#' + a.id), ' ',
+        el('span', { class: 'agent' }, a.agent), ' ',
+        el('span', { class: 'kind' }, a.kind === 'apply_commit' ? 'apply' : 'spawn'), ' ',
+      );
+      if (a.sha_short) row.append(el('code', {}, a.sha_short), ' ');
+      row.append(
+        el('span', { class: 'status status-' + a.status }, a.status), ' ',
+        el('span', { class: 'msg-ts' }, fmtAgo(a.resolved_at)),
+      );
+      li.append(row);
+      if (a.note) {
+        li.append(el('div', { class: 'history-note' }, a.note));
+      }
+      ul.append(li);
+    }
+    root.append(ul);
+  }
+
+  // Relative time, anchored to now. resolved_at is unix seconds (server-
+  // authored), so we don't have to worry about client/server clock skew
+  // for sub-minute precision.
+  function fmtAgo(unixSecs) {
+    const ageSec = Math.max(0, Math.floor(Date.now() / 1000 - unixSecs));
+    if (ageSec < 60) return ageSec + 's ago';
+    if (ageSec < 3600) return Math.floor(ageSec / 60) + 'm ago';
+    if (ageSec < 86400) return Math.floor(ageSec / 3600) + 'h ago';
+    return Math.floor(ageSec / 86400) + 'd ago';
+  }
+
   // ─── state polling ──────────────────────────────────────────────────────
   let pollTimer = null;
   // Sections whose innerHTML gets blown away on each refresh. If the