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/BulkEditModal.tsx

@@ -12,7 +12,7 @@ import {
 } from '@/components/ui/select';
 import { useI18n } from '@/lib/i18n';
 
-type FieldKind = 'status' | 'text';
+type FieldKind = 'status' | 'text' | 'freq';
 type FieldDef = { id: string; label: string; group: string; kind: FieldKind; upper?: boolean };
 
 // Fields a bulk edit may target. status → Y/N/R/I dropdown; text → free input.
@@ -74,6 +74,9 @@ const FIELDS: FieldDef[] = [
   { id: 'sig',      label: 'bulk.fSig',     group: 'Contacted station', kind: 'text' },
   { id: 'sig_info', label: 'bulk.fSigInfo', group: 'Contacted station', kind: 'text' },
   // Misc
+  // Frequency (MHz) — sets freq_hz AND recomputes band. Main use: fixing a batch
+  // logged on a stale/default frequency after CAT dropped.
+  { id: 'freq',    label: 'bulk.fFreq',    group: 'Misc', kind: 'freq' },
   { id: 'comment', label: 'bulk.fComment', group: 'Misc', kind: 'text' },
   { id: 'notes',   label: 'bulk.fNotes',   group: 'Misc', kind: 'text' },
   { id: 'rig',     label: 'bulk.fRig',     group: 'Misc', kind: 'text' },
@@ -180,7 +183,8 @@ export function BulkEditModal({ open, ids, onClose, onApplied }: Props) {
               <Input
                 className="h-8 text-xs"
                 value={textValue}
-                placeholder={t('bulk.clearPlaceholder')}
+                inputMode={def.kind === 'freq' ? 'decimal' : undefined}
+                placeholder={def.kind === 'freq' ? t('bulk.freqPlaceholder') : t('bulk.clearPlaceholder')}
                 onChange={(e) => setTextValue(def.upper ? e.target.value.toUpperCase() : e.target.value)}
               />
             )}
@@ -188,7 +192,7 @@ export function BulkEditModal({ open, ids, onClose, onApplied }: Props) {
 
           <div className="text-[11px] text-muted-foreground">
             {t('bulk.willSet')} <span className="font-semibold">{t(def.label)}</span> ={' '}
-            <span className="font-mono">{effectiveValue === '' ? t('bulk.blank') : effectiveValue}</span> {t('bulk.onQsos', { n: ids.length })}
+            <span className="font-mono">{effectiveValue === '' ? t('bulk.blank') : effectiveValue}{def.kind === 'freq' && effectiveValue !== '' ? ' MHz' : ''}</span> {t('bulk.onQsos', { n: ids.length })}
           </div>
           {error && <div className="text-xs text-danger">{error}</div>}
         </div>