fix: stop losing decodes, hanging on exit, and wedging the rig link

Three faults an operator's log finally made visible, plus the interface
work that came out of the same session.

Reliability:

- UDP events were dropped on backpressure without a word. A period hands
  over twenty-odd decodes at once, and one slow write to the radio was
  enough to fill the queue — so a decode simply never appeared, and the
  only detector was the operator comparing the panel with JTDX. The drop
  is now counted and logged, panadapter spots went to their own goroutine
  so the radio can no longer hold the decode stream up, and the queue is
  deep enough for a full period.

- The CAT manager waited for its poll loop with a bare <-done. A loop
  wedged in a serial read then blocked every later restart inside Start,
  before it could even try to connect: the rig stayed dead, no line was
  written anywhere, and only killing the process recovered it. The wait
  is bounded at ten seconds and says what it abandoned and why the next
  connect may fail.

- Shutdown had no logging at all, so a hang left nothing to go on and a
  process the operator had to kill — which then blocked the restart after
  an update. Every step is logged, and a watchdog forces the exit if one
  of them never returns.

Auto-call:

- A QSO in progress is now held by OpsLog itself rather than inferred
  from the sender's Status. The moment WSJT-X/JTDX dropped the DX call or
  the Enable-Tx flag between overs, the exchange looked finished and the
  next CQ was answered, interleaving two and then three QSOs on one
  slice. Released on log, on halt, on taking over, and by a watchdog.

Cluster console:

- Replies to a command were buried under the spot flood; a Replies
  toggle hides the DX spots, which the list above already shows.
- Twelve named command buttons beside the input, configured in
  Settings -> Cluster; a button with no command is not drawn.
- Following the tail is now an explicit switch, and sending a command
  re-arms it. It used to measure "am I at the bottom" AFTER committing
  the new lines, so a ten-line reply looked like the operator had
  scrolled up and was never followed — the one case it exists for.

Awards:

- An award can name NO field. The matching controls disappear with it
  and only hand-assigned references count, which is the only thing that
  can feed a reference like WWBOTA. A test pins that nothing else is
  scanned.
- WWBOTA added to the catalogue with its 31 342 references.

Elsewhere: the rotor widget's Stop button acknowledges the press like
the direction presets already did, and the docked band map can be
switched to fit-to-band from its own header.

frontend/src/components/AwardEditor.tsx

@@ -62,6 +62,10 @@ type Preset = { key: string; name: string; field: string; dxcc: number; refs: Aw
 // organizational only; matching is driven by the field/pattern/dynamic options,
 // so there's no need for separate GRID/DXCC types (use QSOFIELDS + the field).
 const AWARD_TYPES = ['REFERENCE', 'QSOFIELDS', 'CALLSIGN'];
+// Sentinel for "no QSO field at all". The definition stores an empty field, and
+// the matcher already treats that as "nothing to scan" — this only gives the
+// operator a way to ASK for it.
+const NO_FIELD = '__none__';
 const CONFIRM_SRC = [
   { id: 'lotw', label: 'LoTW' }, { id: 'qsl', label: 'QSL' }, { id: 'eqsl', label: 'eQSL' },
   { id: 'qrzcom', label: 'QRZ.com' }, { id: 'custom', label: 'Custom' },
@@ -277,6 +281,7 @@ export function AwardEditor({ open, onClose, onSaved }: Props) {
     }
     return groups;
   }, [testRows]);
+  const noField = !String(cur?.field ?? '').trim();
   const patch = (p: Partial<AwardDef>) => setDefs((ds) => ds.map((d, j) => (j === sel ? { ...d, ...p } : d)));
   const toggleIn = (key: keyof AwardDef, v: string) => {
     const arr = ((cur?.[key] as string[]) ?? []);
@@ -566,11 +571,26 @@ export function AwardEditor({ open, onClose, onSaved }: Props) {
                     <div className="border-t pt-2.5 mt-1 space-y-2.5">
                       <p className="text-[11px] text-muted-foreground">{t('awed.qsoParams')}</p>
                       <Field2 label={t('awed.searchInField')}>
-                        <Select value={cur.field} onValueChange={(v) => patch({ field: v })}>
+                        {/* NO_FIELD is a sentinel because the stored value is the
+                            empty string and a Select cannot carry one — an empty
+                            item value means "show the placeholder" to Radix. */}
+                        <Select value={cur.field || NO_FIELD}
+                          onValueChange={(v) => patch({ field: v === NO_FIELD ? '' : v })}>
                           <SelectTrigger className="h-8 text-xs w-56"><SelectValue /></SelectTrigger>
-                          <SelectContent className="max-h-72">{fields.map((f) => <SelectItem key={f} value={f}>{f}</SelectItem>)}</SelectContent>
+                          <SelectContent className="max-h-72">
+                            <SelectItem value={NO_FIELD}>{t('awed.fieldNone')}</SelectItem>
+                            {fields.map((f) => <SelectItem key={f} value={f}>{f}</SelectItem>)}
+                          </SelectContent>
                         </Select>
                       </Field2>
+                      {/* An award whose references live in no ADIF field at all —
+                          WWBOTA has no column anywhere — has nothing to match on,
+                          and every control below would be a question with no
+                          answer. Hiding them is the point: the references are the
+                          ones the operator assigns to a QSO by hand. */}
+                      {noField ? (
+                        <p className="text-[11px] text-muted-foreground pl-[128px]">{t('awed.fieldNoneHint')}</p>
+                      ) : (<>
                       <Field2 label={t('awed.matchBy')}>
                         <div className="flex items-center gap-3 text-xs">
                           {['code', 'description', 'pattern'].map((m) => (
@@ -630,6 +650,7 @@ export function AwardEditor({ open, onClose, onSaved }: Props) {
                           );
                         })}
                       </div>
+                      </>)}
                     </div>
                   </TabsContent>