feat: Ultrabeam over USB, Paper QSL from the awards grid, per-role schemas

Ultrabeam on a serial port never worked, and three faults were stacked so
each hid the next:

  - Stop() did not wait for the poll loop, so a stopped client kept the COM
    port. Every later client then failed with "Serial port busy" — the
    program holding it being OpsLog itself.
  - startUltrabeam tore the old client down CONCURRENTLY with starting the
    new one, and "Test connection" built a second client on a port already
    ours. Harmless over TCP, fatal on a port with one owner.
  - A silent serial port returns (0, nil) and bufio retries that a hundred
    times: a 4 s timeout became ~7 minutes of a frozen poll loop logging
    nothing.

The controller then answered at once. Confirmed on hardware: the USB cable
presents TWO COM ports, only the second reaches the controller, and only at
19200 baud — so the speed is pinned in code (an FTDI cable opens at any
speed, and a wrong one is indistinguishable from a dead controller) and the
port field says which one to pick. The first exchange after each connect is
hex-dumped, which separates silence from a wrong baud from a misread frame.

Databases now carry only the tables their role needs. Every target used to
get the whole migration set, so a shared MySQL logbook grew settings and
station_profiles tables nothing ever wrote to — an operator inspecting the
server could not tell which copy was authoritative. Statements are filtered
by role, unknown tables are kept in both (fail-safe), and existing databases
are cleaned once, dropping only EMPTY tables. Settings → Database gains a
Compact button, since SQLite frees pages inside the file and never shrinks it.

Also:
  - Awards: the callsigns behind a cell open the QSL Manager on Paper QSL,
    searched, ready for the card dates.
  - The record button no longer goes missing after an update: whether manual
    recording is possible is a per-profile question that was asked once, at
    startup, before the profile was known.
  - Alert rules and filter presets confirm that they were saved.
  - Spot clicks on the radio panadapter carry the POTA park into F3.
  - The build gate is re-checked wherever the active callsign can change; it
    ran at startup alone, and a fresh install has no callsign then.

frontend/src/components/QSLManagerModal.tsx

@@ -134,9 +134,14 @@ export type GridActions = {
   onDelete?: (ids: number[]) => void;
 };
 
-export function QSLManagerPanel({ onEditQSO, actions }: {
+export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
   onEditQSO?: (id: number) => void;
   actions?: GridActions;
+  // A callsign to open the Paper QSL view on, sent from elsewhere in the app
+  // (the awards grid). Carries a counter rather than being a bare string: the
+  // panel is force-mounted and keeps its state, so asking twice for the SAME
+  // callsign has to be two requests, not one unchanged prop.
+  paperRequest?: { call: string; n: number };
 } = {}) {
   const { t } = useI18n();
   const [service, setService] = useState('lotw');
@@ -198,6 +203,27 @@ export function QSLManagerPanel({ onEditQSO, actions }: {
   }, [paperCall]);
 
 
+  // Honour an incoming request: switch to Paper QSL, fill the callsign, search.
+  // The search runs from the effect below once paperCall has actually changed —
+  // searchPaper closes over paperCall, so calling it here would search the
+  // PREVIOUS callsign.
+  // The pending request's callsign, so the search fires for THAT callsign and
+  // for nothing else: the effect below also wakes on every keystroke in the
+  // field, and searching on each of them would query the log letter by letter.
+  const pendingPaperCall = useRef('');
+  useEffect(() => {
+    const call = paperRequest?.call?.trim().toUpperCase();
+    if (!call) return;
+    setService('paper');
+    setPaperCall(call);
+    pendingPaperCall.current = call;
+  }, [paperRequest?.call, paperRequest?.n]);
+  useEffect(() => {
+    if (!pendingPaperCall.current || paperCall !== pendingPaperCall.current) return;
+    pendingPaperCall.current = '';
+    searchPaper();
+  }, [paperCall, searchPaper]);
+
   async function applyPaper() {
     const ids = paperRows.filter((r) => paperSel.has(r.id)).map((r) => r.id);
     if (ids.length === 0) return;