feat(omnirig): say which of its two CW bits means CW on this rig

Reported on an IC-7610 shared through OmniRig: clicking a CW spot put
the radio in CW-R every time, and the only way out was to edit the
OmniRig rig file by hand.

OmniRig's model has two CW modes, PM_CW_U and PM_CW_L, and nothing in it
says which one an .ini calls plain CW. Icom rig files disagree with each
other — on some PM_CW_U is CI-V mode 0x03 (CW), on others 0x07 (CW-R) —
so asking for "CW" is a question with two right answers and OpsLog was
only ever giving one of them.

Settings ▸ CAT ▸ OmniRig now carries the answer for THIS rig, and it is
pushed to a radio that is already connected rather than waiting for a
reconnect: which bit a mode maps to is not worth dropping the link, and
with it WSJT-X's rigctl session. Same shape as the Yaesu RTTY sideband,
for the same reason.

Nothing changes for anyone whose rig file already agrees with us.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

frontend/src/components/SettingsModal.tsx

@@ -1859,7 +1859,7 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
   // IC-7610 the moment they chose Other.
   const [icomCustom, setIcomCustom] = useState(false);
   const [catCfg, setCatCfg] = useState<CATSettings>({
-    enabled: false, backend: 'omnirig', omnirig_rig: 1, omnirig_vfo: '', flex_host: '', flex_port: 4992, flex_spots: false, flex_decode_spots: false, flex_decode_secs: 120, flex_dvk_dax: false,
+    enabled: false, backend: 'omnirig', omnirig_rig: 1, omnirig_vfo: '', omnirig_cw_lower: false, flex_host: '', flex_port: 4992, flex_spots: false, flex_decode_spots: false, flex_decode_secs: 120, flex_dvk_dax: false,
     yaesu_port: '', yaesu_baud: 38400, yaesu_low_lines: false, yaesu_rtty_usb: false, kenwood_low_lines: false, kenwood_port: '', kenwood_baud: 9600, kenwood_host: '', kenwood_link: 'usb', kenwood_data_mode: 'usb', xiegu_port: '', xiegu_baud: 19200, xiegu_addr: 0x70, xiegu_ptt_line: '',
     icom_port: '', icom_baud: 115200, icom_addr: 0x98, icom_net_host: '', icom_net_user: '', icom_net_pass: '', icom_net_audio: false,
     tci_host: '', tci_port: 40001, tci_spots: false, poll_ms: 250, delay_ms: 0, offset_on: false, offset_hz: 0,
@@ -3640,6 +3640,16 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
               <p className="text-[10px] text-muted-foreground">{t('cat.omnirigVfoHint')}</p>
             </div>
             )}
+            {catCfg.backend === 'omnirig' && (
+            <div className="space-y-1 col-span-2">
+              <label className="flex items-start gap-2 text-sm cursor-pointer">
+                <Checkbox className="mt-0.5" checked={!!catCfg.omnirig_cw_lower}
+                  onCheckedChange={(c) => setCatCfg((s) => ({ ...s, omnirig_cw_lower: !!c }))} />
+                <span>{t('cat.omnirigCwLower')}</span>
+              </label>
+              <p className="text-[10px] text-muted-foreground">{t('cat.omnirigCwLowerHint')}</p>
+            </div>
+            )}
             {catCfg.backend === 'flex' && (
             <>
               <div className="space-y-1">