fix: the Yaesu keyer asked for a COM port it does not use

Selecting the Yaesu keyer fell through to the WinKeyer branch of the settings,
which offers a serial port picker and a Connect button. So the operator went
hunting for the right port — trying the standard COM and the enhanced one in turn
— and neither connected, because this keyer uses NEITHER: it keys over the CAT
link already configured in Settings → CAT.

It now has its own branch, like the Flex one: a speed field, the warning when the
CAT backend is not a Yaesu, and a line saying explicitly that keying rides the
CAT link. Speed changes go to the rig's keyer instead of a WinKeyer that is not
there.

frontend/src/components/SettingsModal.tsx

@@ -3325,12 +3325,6 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             </label>
           </div>
 
-          {wk.engine === 'yaesu' && (!catCfg.enabled || catCfg.backend !== 'yaesu') && (
-            <p className="text-xs font-medium text-warning -mt-1 flex items-start gap-1.5">
-              <span aria-hidden>⚠</span>
-              <span>{t('wk.catWarnYaesu', { backend: catCfg.enabled ? (catCfg.backend || 'none') : 'disabled' })}</span>
-            </p>
-          )}
           {wk.engine === 'icom' ? (
             <>
               {(!catCfg.enabled || catCfg.backend !== 'icom') && (
@@ -3346,6 +3340,22 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
                 </div>
               </div>
             </>
+          ) : wk.engine === 'yaesu' ? (
+            <>
+              {(!catCfg.enabled || catCfg.backend !== 'yaesu') && (
+                <p className="text-xs font-medium text-warning -mt-1 flex items-start gap-1.5">
+                  <span aria-hidden>⚠</span>
+                  <span>{t('wk.catWarnYaesu', { backend: catCfg.enabled ? (catCfg.backend || 'none') : 'disabled' })}</span>
+                </p>
+              )}
+              <p className="text-xs text-muted-foreground -mt-1">{t('wk.yaesuHint')}</p>
+              <div className="grid grid-cols-4 gap-3">
+                <div className="space-y-1">
+                  <Label>{t('wk.speed')}</Label>
+                  <Input type="number" min={4} max={60} value={wk.wpm} onChange={(e) => setWkField({ wpm: num(e.target.value, 25) })} className="font-mono" />
+                </div>
+              </div>
+            </>
           ) : wk.engine === 'flex' ? (
             <>
               {(!catCfg.enabled || catCfg.backend !== 'flex') && (