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/AlertsModal.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { Bell, Plus, Trash2, Volume2, Mail, Eye, X, Search } from 'lucide-react';
 import {
   Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription,
@@ -102,17 +102,40 @@ export function AlertsModal({ onClose, bands, modes, countries }: {
     return alerts.Rule.createFrom({ ...d, [key]: next });
   });
 
+  // Saving used to be silent: the dialog stays open and the rule looks exactly
+  // as it did a second earlier, so there was nothing to tell an operator whether
+  // the click had registered. A line that says so, and clears itself.
+  const [savedMsg, setSavedMsg] = useState('');
+  const savedTimer = useRef(0);
+  function flashSaved(text: string) {
+    setSavedMsg(text);
+    window.clearTimeout(savedTimer.current);
+    savedTimer.current = window.setTimeout(() => setSavedMsg(''), 3000);
+  }
+  useEffect(() => () => window.clearTimeout(savedTimer.current), []);
+
   async function save() {
     if (!draft) return;
     if (!draft.name.trim()) { setErr(t('altm.giveName')); return; }
-    try { const saved = await SaveAlertRule(draft); await refresh(); loadDraft(saved as Rule); setErr(''); }
-    catch (e: any) { setErr(String(e?.message ?? e)); }
+    try {
+      const saved = await SaveAlertRule(draft);
+      await refresh();
+      loadDraft(saved as Rule);
+      setErr('');
+      flashSaved(t('altm.saved', { name: draft.name.trim() }));
+    } catch (e: any) { setErr(String(e?.message ?? e)); }
   }
   async function del() {
     if (!draft) return;
     if (!draft.id) { loadDraft(null); return; }
     if (!window.confirm(t('altm.deleteConfirm', { name: draft.name }))) return;
-    try { await DeleteAlertRule(draft.id); loadDraft(null); await refresh(); }
+    try {
+      const name = draft.name;
+      await DeleteAlertRule(draft.id);
+      loadDraft(null);
+      await refresh();
+      flashSaved(t('altm.deleted', { name }));
+    }
     catch (e: any) { setErr(String(e?.message ?? e)); }
   }
 
@@ -257,6 +280,7 @@ export function AlertsModal({ onClose, bands, modes, countries }: {
                 {/* Editor actions */}
                 <div className="flex items-center gap-2 px-3 py-2 border-t border-border/60">
                   {err && <span className="text-[11px] text-danger flex-1 truncate">{err}</span>}
+                  {!err && savedMsg && <span className="text-[11px] text-success flex-1 truncate">{savedMsg}</span>}
                   <div className="flex-1" />
                   <Button variant="ghost" size="sm" className="text-danger" onClick={del}><Trash2 className="size-3.5" /> {t('altm.delete')}</Button>
                   <Button size="sm" onClick={save}>{t('altm.saveRule')}</Button>