style(flex): narrow the chaser's offset box, give it room

An offset is a handful of Hz, never a wide number, and the box sat flush
against the button it belongs to.

frontend/src/components/FlexPanel.tsx

@@ -708,7 +708,7 @@ export function FlexPanel({ onCWSpeed, onReportRST }: { onCWSpeed?: (wpm: number
                   className="w-16 h-6 rounded border border-input bg-background px-1 text-[11px] font-mono uppercase" />
               )}
               {rstChase.enabled && (
-                <label className="flex items-center gap-1 text-[11px] text-muted-foreground whitespace-nowrap">
+                <label className="flex items-center gap-1 text-[11px] text-muted-foreground whitespace-nowrap ml-2">
                   {t('flxp.rstChaseOffset')}
                   <input type="number" step={10} value={rstChaseOffsetText}
                     onChange={(e) => setRstChaseOffsetText(e.target.value)}
@@ -721,7 +721,7 @@ export function FlexPanel({ onCWSpeed, onReportRST }: { onCWSpeed?: (wpm: number
                       const next = { ...rstChase, offset_hz: v };
                       setRstChase(next); SaveFlexRSTChase(next as any).catch(() => {});
                     }}
-                    className="w-16 h-6 rounded border border-input bg-background px-1 text-[11px] font-mono" />
+                    className="w-12 h-6 rounded border border-input bg-background px-1 text-[11px] font-mono" />
                   Hz
                 </label>
               )}