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/src/approvals.rs

@@ -102,6 +102,22 @@ impl Approvals {
         Ok(())
     }
 
+    /// Last `limit` resolved approvals (approved / denied / failed),
+    /// newest-first. Drives the history tab on the dashboard.
+    pub fn recent_resolved(&self, limit: u64) -> Result<Vec<Approval>> {
+        let conn = self.conn.lock().unwrap();
+        let mut stmt = conn.prepare(
+            "SELECT id, agent, kind, commit_ref, requested_at, status, resolved_at, note, fetched_sha
+               FROM approvals
+              WHERE status IN ('approved', 'denied', 'failed')
+              ORDER BY resolved_at DESC, id DESC
+              LIMIT ?1",
+        )?;
+        let rows = stmt.query_map([limit], row_to_approval)?;
+        rows.collect::<rusqlite::Result<Vec<_>>>()
+            .map_err(Into::into)
+    }
+
     pub fn pending(&self) -> Result<Vec<Approval>> {
         let conn = self.conn.lock().unwrap();
         let mut stmt = conn.prepare(