fix: RST fields too narrow for a 59+30 report

I took the callsign field's extra width from the RST pair, on the assumption
that five characters was the most they would ever hold. A signal report of
"59+30" is exactly five characters plus its padding, and it was clipped.

The RST fields are back to their original width. The callsign keeps its extra
room — the row has space for both.

frontend/src/App.tsx

@@ -3719,8 +3719,10 @@ export default function App() {
   // The callsign field is WIDER than the fields around it, deliberately: it is
   // the one field always typed into, it carries the REC badges on its right, and
   // a long portable call (VK9/OH1ABC/MM) must stay readable as it is entered.
-  // The room comes from the RST pair, which never needs more than five
+  // It was widened by taking room from the RST pair — until a signal report of
-  // characters.
+  // "59+30" turned up, which is five characters plus its padding and no longer
+  // fitted. The RST fields are back to their original width; the callsign keeps
+  // the rest of the row.
   const callsignBlock = (
     <div className="flex flex-col w-56" data-esm="call">
       <Label className="flex items-center gap-2 h-3.5" style={{ marginBottom: 6 }}>
@@ -3869,12 +3871,12 @@ export default function App() {
     </div>
   );
   const rstTxBlock = (
-    <div className="flex flex-col w-16" data-esm="rsttx"><Label className="mb-1 h-3.5">{t('field.rstTx')}</Label>
+    <div className="flex flex-col w-20" data-esm="rsttx"><Label className="mb-1 h-3.5">{t('field.rstTx')}</Label>
       <Combobox value={rstSent} options={rstOptions(mode, rstLists)} commitOnType onChange={(v) => { setRstSent(v); rstUserEditedRef.current = true; }} />
     </div>
   );
   const rstRxBlock = (
-    <div className="flex flex-col w-16" data-esm="rstrx"><Label className="mb-1 h-3.5">{t('field.rstRx')}</Label>
+    <div className="flex flex-col w-20" data-esm="rstrx"><Label className="mb-1 h-3.5">{t('field.rstRx')}</Label>
       <Combobox value={rstRcvd} options={rstOptions(mode, rstLists)} commitOnType onChange={(v) => { setRstRcvd(v); rstUserEditedRef.current = true; }} />
     </div>
   );