feat: Station Control amp parity + all amps, Help→Send log to F4BPO, bulk-edit frequency, fix Cluster midnight sort

- Station Control: the amplifier panel is now the exact same card as the FlexRadio panel (extracted shared AmpCard: OPERATE/STANDBY, ON/OFF, power level, output-power bar, live FWD/ID/temp meters). Every configured amp gets its own card — no dropdown.
- Help → "Send log to F4BPO" (only when SMTP is configured): e-mails opslog.log + previous session + crash log to the developer. New email.SendFiles for multi-attachment.
- Bulk edit: new "Frequency (MHz)" field sets freq_hz AND recomputes band; out-of-band values rejected. Fixes a run logged on a stale/default freq after CAT dropped.
- Cluster: Time column sorted lexically on the HHMMZ string, so spots after 0000Z sorted below 2359Z and looked frozen at the UTC rollover. Now sorts by real arrival time.
- Also folds in the DVK auto-CQ/2-column layout and Station Control dashboard batch (changelog 0.20.10, EN+FR).

frontend/src/components/ClusterGrid.tsx

@@ -149,6 +149,16 @@ const makeColCatalog = (t: TFn): ColEntry[] => [
     headerName: t('clg2.c.time'), field: 'time_utc' as any, width: 80, cellClass: 'font-mono',
     defaultVisible: true,
     sort: 'desc',
+    // Sort by the real arrival timestamp, NOT the "HHMMZ" display string. A
+    // lexical sort of time_utc breaks at the UTC day rollover: "0001Z" sorts
+    // below "2359Z", so spots received just after midnight fell to the bottom
+    // and looked like the cluster had stopped. received_at is a full datetime
+    // that keeps ordering correct across 0000Z.
+    comparator: (_a: any, _b: any, nodeA: any, nodeB: any) => {
+      const ta = Date.parse(nodeA?.data?.received_at ?? '') || 0;
+      const tb = Date.parse(nodeB?.data?.received_at ?? '') || 0;
+      return ta - tb;
+    },
     cellStyle: { color: 'var(--muted-foreground)' },
   },
   {