feat: ADIF monitor — auto-import QSOs from watched external ADIF files

Watches a configurable list of external ADIF files (fldigi RTTY logbook,
N1MM, VarAC…) and imports newly appended QSOs automatically. Each record
goes through the existing UDP-log path, so it gets full enrichment, ±2-minute
dedup (shared udpLogMu, can't race the UDP auto-log) and automatic upload to
the configured external services — no per-file toggles like Log4OM.

A newly added file starts at its current size (offset -1 sentinel → size on
first scan), so the QSOs already in it are NOT bulk-imported; only contacts
logged after it was added come in. Reads only up to the last complete <eor>
so a half-written record waits. Handles truncation/rotation (re-reads from 0,
dedup protects) and persists per-file offsets without clobbering a concurrent
UI edit of the file list.

New Settings → ADIF monitor section: master enable + add/remove/toggle files.
Backend emits adifmon:imported → the grid refreshes and a toast reports the
count. i18n EN + FR.

frontend/src/components/SettingsModal.tsx

@@ -42,6 +42,7 @@ import {
   ComputeStationInfo,
   GetUIPref, SetUIPref,
   GetFlexState, GetFlexBandAntennas, SaveFlexBandAntennas,
+  GetADIFMonitor, SaveADIFMonitor, PickADIFMonitorFile,
 } from '../../wailsjs/go/main/App';
 import type { profile as profileModels } from '../../wailsjs/go/models';
 import type { LookupSettingsForm, StationSettingsForm, ListsSettingsForm, ModePresetForm } from '@/types';
@@ -169,6 +170,7 @@ type SectionId =
   | 'confirmations'
   | 'external-services'
   | 'udp'
+  | 'adifmon'
   | 'lookup'
   | 'lists-bands'
   | 'lists-modes'
@@ -225,6 +227,7 @@ function buildTree(flexAvailable: boolean, t: (k: string) => string): TreeNode[]
       ]},
       { kind: 'item', label: t('sec.cluster'),     id: 'cluster' },
       { kind: 'item', label: t('sec.udp'), id: 'udp' },
+      { kind: 'item', label: t('sec.adifmon'), id: 'adifmon' },
       { kind: 'item', label: t('sec.uscounties'), id: 'uscounties' },
       { kind: 'item', label: t('sec.database'), id: 'database' },
       { kind: 'item', label: t('sec.autostart'), id: 'autostart' },
@@ -241,6 +244,7 @@ const SECTION_KEY: Partial<Record<SectionId, string>> = {
   station: 'sec.station', profiles: 'sec.profiles', operating: 'sec.operating', confirmations: 'sec.confirmations',
   'external-services': 'sec.external', lookup: 'sec.lookup', 'lists-bands': 'sec.bands', 'lists-modes': 'sec.modes',
   cluster: 'sec.cluster', backup: 'sec.backup', database: 'sec.database', autostart: 'sec.autostart', udp: 'sec.udp',
+  adifmon: 'sec.adifmon',
   uscounties: 'sec.uscounties',
   awards: 'sec.awards', cat: 'sec.cat', rotator: 'sec.rotator', winkeyer: 'sec.winkeyer', antenna: 'sec.antenna',
   antgenius: 'sec.antgenius', pgxl: 'sec.pgxl', flex: 'sec.flex', audio: 'sec.audio', general: 'sec.general', email: 'sec.email',
@@ -261,6 +265,7 @@ const SECTION_LABELS: Partial<Record<SectionId, string>> = {
   database: 'Database',
   autostart: 'Autostart',
   udp: 'UDP integrations',
+  adifmon: 'ADIF monitor',
   awards: 'Awards',
   cat: 'CAT interface',
   rotator: 'Rotator',
@@ -576,6 +581,61 @@ function LiveStatusToggle() {
   );
 }
 
+// ADIFMonitorPanel watches a list of external ADIF files (fldigi RTTY, N1MM,
+// VarAC…) and auto-imports newly appended QSOs — deliberately option-free: a
+// contact that arrives is imported and uploaded automatically like any log entry.
+type ADIFWatchFileUI = { path: string; enabled: boolean; offset: number };
+type ADIFMonitorCfgUI = { enabled: boolean; files: ADIFWatchFileUI[] };
+function ADIFMonitorPanel() {
+  const { t } = useI18n();
+  const [cfg, setCfg] = useState<ADIFMonitorCfgUI>({ enabled: false, files: [] });
+  const [loaded, setLoaded] = useState(false);
+  useEffect(() => {
+    GetADIFMonitor()
+      .then((c: any) => { if (c) setCfg({ enabled: !!c.enabled, files: (c.files ?? []) as ADIFWatchFileUI[] }); })
+      .catch(() => {})
+      .finally(() => setLoaded(true));
+  }, []);
+  // Offsets are managed backend-side; SaveADIFMonitor ignores the ones we send and
+  // keeps each existing file's read position (a new file starts at end-of-file).
+  const persist = (next: ADIFMonitorCfgUI) => { setCfg(next); SaveADIFMonitor(next as any).catch(() => {}); };
+  const addFile = async () => {
+    try {
+      const p = await PickADIFMonitorFile();
+      if (!p || cfg.files.some((f) => f.path === p)) return;
+      persist({ ...cfg, files: [...cfg.files, { path: p, enabled: true, offset: -1 }] });
+    } catch { /* dialog cancelled */ }
+  };
+  return (
+    <div className="space-y-4 max-w-2xl">
+      <p className="text-xs text-muted-foreground">{t('adifmon.hint')}</p>
+      <label className="flex items-center gap-2 text-sm cursor-pointer">
+        <Checkbox checked={cfg.enabled} disabled={!loaded} onCheckedChange={(c) => persist({ ...cfg, enabled: !!c })} />
+        {t('adifmon.enable')}
+      </label>
+      <div className="space-y-1.5">
+        {cfg.files.length === 0 && <p className="text-xs text-muted-foreground italic">{t('adifmon.empty')}</p>}
+        {cfg.files.map((f, i) => (
+          <div key={i} className="flex items-center gap-2 rounded-md border border-border bg-muted/20 px-2 py-1.5">
+            <Checkbox checked={f.enabled}
+              onCheckedChange={(c) => persist({ ...cfg, files: cfg.files.map((x, idx) => idx === i ? { ...x, enabled: !!c } : x) })} />
+            <span className="flex-1 font-mono text-xs truncate" title={f.path}>{f.path}</span>
+            <button type="button" title={t('adifmon.remove')}
+              className="text-muted-foreground hover:text-destructive shrink-0"
+              onClick={() => persist({ ...cfg, files: cfg.files.filter((_, idx) => idx !== i) })}>
+              <Trash2 className="size-3.5" />
+            </button>
+          </div>
+        ))}
+      </div>
+      <Button variant="outline" size="sm" onClick={addFile}>
+        <FolderOpen className="size-3.5 mr-1" /> {t('adifmon.add')}
+      </Button>
+      <p className="text-[11px] text-muted-foreground">{t('adifmon.note')}</p>
+    </div>
+  );
+}
+
 // MainViewPanes lets the operator choose what the Main tab's left and right
 // panes show, independently: the great-circle map, the locator street map, the
 // cluster grid or the worked-before grid. Per-profile (stored via SetUIPref,
@@ -4451,6 +4511,7 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
     'lists-modes':  ModesPanel,
     cluster:        ClusterPanel,
     udp:            UDPIntegrationsPanelWrapper,
+    adifmon:        ADIFMonitorPanel,
     backup:         BackupPanel,
     database:       DatabasePanel,
     uscounties:     USCountiesPanel,