feat(ui): PSK Reporter chip in the status bar

Beside the rig and amplifier chips, before ON AIR, because it is the same kind
of fact they report: a link that is either up or it is not. Clicking it opens
the settings that control it, like the amplifier chips do.

Shown ONLY while the opening watch is on. A permanently grey chip for a feature
nobody enabled is clutter, and the bar is 28 px tall — every chip in it has to
earn its width.

Green once decodes are arriving, amber while connected but silent: those are
different states and an operator wondering why no opening has been announced
needs to tell them apart. The count itself is in the tooltip, not on the chip —
it moves several times a second on an open band, and a number flickering in the
corner of the eye is a distraction rather than information.

frontend/src/lib/i18n.tsx

@@ -15,7 +15,7 @@ const en: Dict = {
   // Menu bar
   'prop.title': 'Propagation', 'prop.geomag': 'Geomag', 'prop.refresh': 'Refresh space weather',
   'live.onAir': 'On air', 'live.offline': 'Offline',
-  'live.onAirTip': 'On air — a QSO was logged in the last 5 minutes (published to the live status)',
+  'pskr.tip': 'PSK Reporter — {n} decodes received on {bands}. Click for settings.', 'live.onAirTip': 'On air — a QSO was logged in the last 5 minutes (published to the live status)',
   'live.offlineTip': 'Offline — no QSO logged in the last 5 minutes',
   'live.stationsTitle': 'Stations on air', 'live.stationsEmpty': 'No station reporting yet.', 'live.stationsHide': 'Hide',
   'upd.available': 'OpsLog v{v} available', 'upd.current': "You're on v{v}.",
@@ -451,7 +451,7 @@ const en: Dict = {
 const fr: Dict = {
   'prop.title': 'Propagation', 'prop.geomag': 'Géomag', 'prop.refresh': 'Actualiser la météo spatiale',
   'live.onAir': 'On air', 'live.offline': 'Hors ligne',
-  'live.onAirTip': "On air — un QSO a été loggé dans les 5 dernières minutes (publié dans le statut live)",
+  'pskr.tip': 'PSK Reporter — {n} décodages reçus sur {bands}. Cliquer pour les réglages.', 'live.onAirTip': "On air — un QSO a été loggé dans les 5 dernières minutes (publié dans le statut live)",
   'live.offlineTip': 'Hors ligne — aucun QSO loggé depuis 5 minutes',
   'live.stationsTitle': 'Stations on air', 'live.stationsEmpty': 'Aucune station ne reporte pour le moment.', 'live.stationsHide': 'Masquer',
   'rate.title': 'Rythme QSO (QSO/heure) — projeté sur les 10 / 60 dernières minutes',