feat(email): editable subject/body for the QSO recording e-mail

The recording e-mail's subject and body round-tripped through EmailSettings and
the backend (keyEmailSubject/keyEmailBody) but had no UI editor — only the QSL
card e-mail did, so the recording mail was stuck on the default text. Add the
same subject/body editor to the E-mail panel, above the QSL block, sharing the
{CALL}/{DATE}/{BAND}/{MODE}/{MYCALL} template variables.

frontend/src/components/SettingsModal.tsx

@@ -5802,6 +5802,17 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             <span className="text-[11px] text-muted-foreground">{emailMsg}</span>
           </div>
 
+          <div className="pt-2 mt-2 border-t border-border space-y-2">
+            <Label className="text-sm font-semibold">{t('em.recEmail')}</Label>
+            <div className="text-[11px] text-muted-foreground">
+              {t('em.recVarsHint')} {'{CALL}'} {'{DATE}'} {'{BAND}'} {'{MODE}'} {'{MYCALL}'}.
+            </div>
+            <Input className="h-8" placeholder={t('em.subject')} value={emailCfg.subject}
+              onChange={(e) => setEmailField({ subject: e.target.value })} />
+            <Textarea rows={3} className="text-sm" placeholder={t('em.body')} value={emailCfg.body}
+              onChange={(e) => setEmailField({ body: e.target.value })} />
+          </div>
+
           <div className="pt-2 mt-2 border-t border-border space-y-2">
             <Label className="text-sm font-semibold">{t('em.qslCardEmail')}</Label>
             <div className="text-[11px] text-muted-foreground">