feat: panadapter spots that read, a CI-V link that survives, no auto-call

Panadapter spots are now worth reading. The comment carries the spotter, the
entity and the status in DXHunter's own shape — "CQ up 2 [F4BPO] [Franz Josef
Land] [New Slot]" — which needed two things nothing documents: SmartSDR splits
its command line on SPACES, so the words ran together until every space became
non-breaking; and it truncates past ~60 characters, so the cluster's own words
are trimmed first and the three brackets always survive. RBN column padding is
collapsed on the way in, or a preserved run of spaces opened a gap wide enough
to push the rest off screen.

"Already worked" means the CALLSIGN is in the log, not the entity: saying it of
a station never contacted was simply wrong. Each status can also be kept off the
panadapter entirely, and the WSJT-X decode spots obey the same switches — the
palette governs the panadapter, not one of the two things that feed it.

And the radio is no longer hammered: a spot whose frequency, colour and comment
are unchanged is not removed and redrawn. A busy skimmer feed re-spots the same
station every few seconds; one two-minute session sent 2128 adds, 88 of them for
a single callsign, and the display did not move a pixel for any of them.

CI-V, from an IC-7850 that kept killing JTDX: a reply the rig sent to another
controller on the same bus is no longer taken for ours, and a set_ptt, set_freq
or set_mode whose acknowledgement goes missing is verified by reading the rig
back instead of being reported as a failure. WSJT-X and JTDX answer a failed
command with a Rig Control Error and drop the link mid-over — 98 keyings, 6 lost
acknowledgements, 2 dropped connections in one session. The check waits 700 ms,
not the poll's 150: the rig has just failed to answer twice because it was
retuning, and a short probe would fail for the same reason.

Auto-call is withdrawn — it duplicated DXHunter, which already answers decodes,
and two programs deciding that from one shack key over each other. The library
is kept whole and dormant; a guard in App.tsx makes sure a stored preference
cannot key a transmitter whose switch no longer exists.

Also:
  - the log rotates while running, not only at startup: the CI-V trace left on
    wrote 416 MB and nothing would have stopped it before the disk did. Closing
    it now releases the crash file too — the runtime keeps its own duplicate.
  - the interface zoom announces itself, with a badge, a click back to 100% and
    a View menu; Ctrl+wheel and Ctrl+0 always worked and nothing said so.
  - no more elastic bounce, and no swipe-to-navigate out of the app.
  - Edit QSO: your own TX power and the contacted station's extended locator
    were saved and written back with no box to set them.
  - FT decodes: continents are a multiple choice; a compound MSHV message that
    answers two stations in one line is recognised as addressed to you.

frontend/src/components/QSOEditModal.tsx

@@ -626,6 +626,7 @@ export function QSOEditModal({ qso, onSave, onDelete, onClose, countries = [], b
                   </div>
                   <div className="flex items-end gap-2">
                     <div className="flex flex-col flex-1"><Label>{t('qedit.grid')}</Label><Input value={draft.grid ?? ''} onChange={(e) => set('grid', e.target.value)} className="font-mono uppercase" /></div>
+                    <div className="flex flex-col w-24"><Label>{t('qedit.gridExt')}</Label><Input title={t('qedit.gridExtTip')} value={draft.gridsquare_ext ?? ''} onChange={(e) => set('gridsquare_ext', e.target.value)} className="font-mono uppercase" /></div>
                     <div className="flex flex-col w-24"><Label>PFX</Label><Input readOnly value={pfxOf(draft.callsign ?? '')} className="font-mono bg-muted/40" /></div>
                   </div>
                   <div><Label>{t('qedit.comment')}</Label><Input value={draft.comment ?? ''} onChange={(e) => set('comment', e.target.value)}
@@ -867,7 +868,7 @@ export function QSOEditModal({ qso, onSave, onDelete, onClose, countries = [], b
                 <F label={t('qedit.stationCallsign')} span={3}><Input value={draft.station_callsign ?? ''} onChange={(e) => set('station_callsign', e.target.value)} /></F>
                 <F label={t('qedit.operator')} span={3}><Input value={draft.operator ?? ''} onChange={(e) => set('operator', e.target.value)} /></F>
                 <F label={t('qedit.myGrid')}><Input value={draft.my_grid ?? ''} onChange={(e) => set('my_grid', e.target.value)} /></F>
-                <F label={t('qedit.gridExt')}><Input value={draft.my_gridsquare_ext ?? ''} onChange={(e) => set('my_gridsquare_ext', e.target.value)} /></F>
+                <F label={t('qedit.myGridExt')}><Input title={t('qedit.gridExtTip')} value={draft.my_gridsquare_ext ?? ''} onChange={(e) => set('my_gridsquare_ext', e.target.value)} /></F>
                 <F label={t('qedit.country')} span={2}><Combobox value={draft.my_country ?? ''} options={countries} placeholder={t('qedit.country')} onChange={(v) => set('my_country', v)} /></F>
                 <F label={t('qedit.state')}><Input value={draft.my_state ?? ''} onChange={(e) => set('my_state', e.target.value)} /></F>
                 <F label={t('qedit.county')}><Input value={draft.my_cnty ?? ''} onChange={(e) => set('my_cnty', e.target.value)} /></F>
@@ -903,6 +904,10 @@ export function QSOEditModal({ qso, onSave, onDelete, onClose, countries = [], b
               <div>
                 <p className="text-[11px] font-semibold text-muted-foreground uppercase tracking-wider mb-2">{t('qedit.powerWeather')}</p>
                 <div className="grid grid-cols-6 gap-3">
+                  {/* YOUR power first, then theirs. tx_pwr was saved by this
+                      editor but had no field: a contact logged at the wrong
+                      power could be read back and never corrected. */}
+                  <F label={t('qedit.txPower')}><Input type="number" value={draft.tx_pwr ?? ''} onChange={(e) => set('tx_pwr', numOrUndef(e.target.value) as any)} /></F>
                   <F label={t('qedit.rxPower')}><Input type="number" value={draft.rx_pwr ?? ''} onChange={(e) => set('rx_pwr', numOrUndef(e.target.value) as any)} /></F>
                   <F label={t('qedit.distance')}><Input type="number" value={draft.distance ?? ''} onChange={(e) => set('distance', numOrUndef(e.target.value) as any)} /></F>
                   <F label={t('qedit.aIndex')}><Input type="number" value={draft.a_index ?? ''} onChange={(e) => set('a_index', numOrUndef(e.target.value) as any)} /></F>