feat(entry): one padlock instead of five

Logging a contact from a piece of paper — a contest sheet, a friend's
report, a QSO worked on another radio — means the frequency, the band,
the mode, the date and both times all have to stop following the rig and
the clock at once. That is a single decision, and it was five clicks in
five different places, each of which had to be found first.

The padlock beside Start UTC now holds all five and releases all five,
with the same behaviour as before: locking pre-fills the times so the
fields are not empty, unlocking hands them back to the clock and snaps a
QSO already in progress to now.

The five per-field locks stay underneath. Everything downstream reads
them, and individually they say the right thing — "this value is
decoupled from the rig". Only the control is one.

frontend/src/lib/i18n.tsx

@@ -72,7 +72,7 @@ const en: Dict = {
   'field.band': 'Band', 'field.mode': 'Mode', 'field.country': 'Country', 'field.comment': 'Comment',
   'field.note': 'Note', 'field.rstTx': 'RST tx', 'field.rstRx': 'RST rx',
   'field.txFreq': 'TX Freq (MHz)', 'field.freqTuneHint': 'Type a frequency and press Enter to tune the radio here.', 'field.freq': 'Freq (MHz)', 'field.rxFreq': 'RX Freq (MHz)', 'field.rxBand': 'RX Band',
-  'field.startUtc': 'Start UTC', 'field.endUtc': 'End UTC', 'field.snt': 'Snt', 'field.rcv': 'Rcv',
+  'field.manualEntryOn': 'Manual entry — hold the frequency, band, mode and both times so you can log a contact from paper while the radio stays where it is', 'field.manualEntryOff': 'Back to following the radio and the clock', 'field.startUtc': 'Start UTC', 'field.endUtc': 'End UTC', 'field.snt': 'Snt', 'field.rcv': 'Rcv',
   'btn.logQso': 'Log QSO', 'btn.clear': 'Clear', 'btn.spot': 'Spot', 'btn.saving': '…',
   // Language chooser
   'lang.choose': 'Choose your language', 'lang.chooseHint': 'You can change this later in Settings → General.',
@@ -691,7 +691,7 @@ const fr: Dict = {
   'field.band': 'Bande', 'field.mode': 'Mode', 'field.country': 'Pays', 'field.comment': 'Commentaire',
   'field.note': 'Note', 'field.rstTx': 'RST tx', 'field.rstRx': 'RST rx',
   'field.txFreq': 'Fréq TX (MHz)', 'field.freqTuneHint': 'Tape une fréquence et appuie sur Entrée pour y accorder la radio.', 'field.freq': 'Fréq (MHz)', 'field.rxFreq': 'Fréq RX (MHz)', 'field.rxBand': 'Bande RX',
-  'field.startUtc': 'Début UTC', 'field.endUtc': 'Fin UTC', 'field.snt': 'Env', 'field.rcv': 'Reç',
+  'field.manualEntryOn': 'Saisie manuelle — fige la fréquence, la bande, le mode et les deux heures, pour enregistrer un contact depuis une feuille pendant que la radio reste où elle est', 'field.manualEntryOff': 'Revenir au suivi de la radio et de l’horloge', 'field.startUtc': 'Début UTC', 'field.endUtc': 'Fin UTC', 'field.snt': 'Env', 'field.rcv': 'Reç',
   'btn.logQso': 'Enregistrer', 'btn.clear': 'Effacer', 'btn.spot': 'Spot', 'btn.saving': '…',
   'lang.choose': 'Choisissez votre langue', 'lang.chooseHint': 'Modifiable plus tard dans Réglages → Général.',
   'lang.english': 'English', 'lang.french': 'Français', 'whatsnew.title': 'Nouveautés', 'whatsnew.newTag': 'Nouveau', 'whatsnew.close': 'Compris', 'whatsnew.none': 'Aucune nouveauté pour cette version pour le moment.',