style(settings): drop the verbose CW Keyer explanations (Flex/Icom notes, ESM hint)

They took vertical space in the CW Keyer panel for text operators already know.
Kept the actionable CAT-backend mismatch warnings and the checkbox labels.

frontend/src/components/SettingsModal.tsx

@@ -3106,20 +3106,14 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
               <Checkbox checked={wk.esc_clears_call} onCheckedChange={(c) => setWkField({ esc_clears_call: !!c })} />
               {t('wk.escClears')}
             </label>
-            <label className="flex items-start gap-2 text-sm cursor-pointer col-span-3 pb-1.5">
-              <Checkbox checked={wk.esm} onCheckedChange={(c) => setWkField({ esm: !!c })} className="mt-0.5" />
-              <span>
-                {t('wk.esm')}
-                <span className="block text-xs text-muted-foreground">{t('wk.esmHint')}</span>
-              </span>
+            <label className="flex items-center gap-2 text-sm cursor-pointer col-span-3 pb-1.5">
+              <Checkbox checked={wk.esm} onCheckedChange={(c) => setWkField({ esm: !!c })} />
+              {t('wk.esm')}
             </label>
           </div>
 
           {wk.engine === 'icom' ? (
             <>
-              <p className="text-xs text-muted-foreground -mt-2">
-                {t('wk.icomNote')}
-              </p>
               {(!catCfg.enabled || catCfg.backend !== 'icom') && (
                 <p className="text-xs font-medium text-warning -mt-1 flex items-start gap-1.5">
                   <span aria-hidden>⚠</span>
@@ -3135,9 +3129,6 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             </>
           ) : wk.engine === 'flex' ? (
             <>
-              <p className="text-xs text-muted-foreground -mt-2">
-                {t('wk.flexNote')}
-              </p>
               {(!catCfg.enabled || catCfg.backend !== 'flex') && (
                 <p className="text-xs font-medium text-warning -mt-1 flex items-start gap-1.5">
                   <span aria-hidden>⚠</span>