feat(ftx): the digital corner gets its own menu, and the watchlist learns to line up

An FTx menu between View and Tools gathers FT Decodes, FT Map and the
Grid squares map — three views of the same UDP feed that were buried in
Tools. And the watchlist spot rows swap the elastic country column for
fixed widths, so band, mode and frequency read as columns instead of
starting wherever each country name happened to end.

frontend/src/App.tsx

@@ -5117,13 +5117,17 @@ export default function App() {
       { type: 'item', label: t('view.refresh'), action: 'view.refresh', shortcut: 'F5' },
       { type: 'item', label: t('view.clearFilters'), action: 'view.clearfilters' },
     ]},
+    // The digital-mode corner gets its own menu: the decode list, its map,
+    // and the grid-square chase all live off the same UDP feed.
+    { name: 'ftx', label: t('menu.ftx'), items: [
+      { type: 'item', label: t('dec.tab'), action: 'tools.decodes' },
+      { type: 'item', label: t('ftmap.tab'), action: 'tools.ftmap' },
+      { type: 'item', label: t('gsm.title'), action: 'tools.grids' },
+    ]},
     { name: 'tools', label: t('menu.tools'), items: [
       { type: 'item', label: t('tools.qslManager'), action: 'tools.qslmanager' },
       { type: 'item', label: t('stats.tab'), action: 'tools.stats' },
       { type: 'item', label: t('station.title'), action: 'tools.station' },
-      { type: 'item', label: t('dec.tab'), action: 'tools.decodes' },
-      { type: 'item', label: t('ftmap.tab'), action: 'tools.ftmap' },
-      { type: 'item', label: t('gsm.title'), action: 'tools.grids' },
       { type: 'item', label: t('tools.qslDesigner'), action: 'tools.qsldesigner' },
       { type: 'separator' },
       { type: 'item', label: (wkEnabled ? '✓ ' : '') + t('tools.winkeyer'), action: 'tools.winkeyer' },