Draw the whole interface in Compose

Etappen 3 to 6a of the migration (129 commits). Every window the operator sees
is Compose; the JavaFX ones still exist beside them so the two could be
compared against a live session, which is the only way the differences came to
light.

The toolchain first, then the settings window with its eleven tabs and 72 real
preferences; then the multi-column table as a component, and with it the rules
it needs -- stable row identity, a selection that survives a refresh, column
order the operator can drag, and a repaint when the rows change rather than
when the list instance does. Then the update and monitor windows, and the main
window: 22 station columns, the filter bar, the selected-station panel, the
message tabs, the priority bar, the sked controls, the status indicators and
the timeline, assembled behind a splitter because Compose has none.

The map stops being a WebView. A Compose canvas projects WebMercator tiles
itself, with the clustering in core and an asynchronous fetcher in place of the
local tile proxy; derive() becomes a pure Kotlin reimplementation instead of a
reflection call into com.sun.javafx.

Most of the volume here is parity the operator would notice rather than new
behaviour: desktop density instead of Material's phone minimums, colours taken
from the JavaFX stylesheets instead of Material's palette, row dividers, band
columns, grid-square labels and their colours, the home marker and antenna
beam, pinch-to-zoom under Wayland, and layouts that survive a window narrower
than the chart they stack.

Two lessons are worth more than the diff. A control bound to a value Compose
cannot observe writes through and never redraws -- that one shipped repeatedly
with a green build, because no test drew anything. And a layout that clips
instead of wrapping is worse than one that is merely too narrow: half a word
is the worst available outcome.

app-desktop/src/test/resources/settings-fields.txt

@@ -0,0 +1,72 @@
+setAirScout_asBandString
+setAirScout_asClientNameString
+setAirScout_asCommunicationPort
+setAirScout_asServerNameString
+setAirScout_asUDPListenerEnabled
+setAirScout_autoBandSelectionEnabled
+setBcn_beaconsEnabledMainCat
+setBcn_beaconsEnabledSecondCat
+setGUI_darkModeActiveByDefault
+setGuiOptions_defaultFilterNothing
+setGuiOptions_defaultFilterPmToMe
+setGuiOptions_defaultFilterPmToOther
+setGuiOptions_defaultFilterPublicMsgs
+setGuiOptions_showFreshCallHintInBandColumns
+setGuiOptions_showGrossFieldWorkedHintInBandColumns
+setLoginChatCategoryMain
+setLoginChatCategorySecond
+setLoginToSecondChatEnabled
+setLogsynch_fileBasedWkdCallInterpreterEnabled
+setLogsynch_fileBasedWkdCallInterpreterFileNameReadOnly
+setLogsynch_ucxUDPWkdCallListenerEnabled
+setLogsynch_ucxUDPWkdCallListenerPort
+setLogsynch_wintestNetworkBroadcastAddress
+setLogsynch_wintestNetworkListenerEnabled
+setLogsynch_wintestNetworkPort
+setLogsynch_wintestNetworkStationNameOfKST
+setLogsynch_wintestNetworkStationNameOfWintestClient1
+setLogsynch_wintestQrgSyncEnabled
+setLogsynch_wintestUsePassQrg
+setMessageHandling_autoAnswerEnabled
+setMessageHandling_autoAnswerEnabledSecondCat
+setMessageHandling_autoAnswerTextMainCat
+setMessageHandling_autoAnswerTextSecondCat
+setMessageHandling_autoAnswerToQRGRequestEnabled
+setNotify_bandUpgradeHintOnLogEnabled
+setNotify_bandUpgradePriorityBoostEnabled
+setNotify_dxClusterServerEnabled
+setNotify_dxclusterServerPort
+setNotify_DXCSrv_SpottersCallSign
+setNotify_optionalFrequencyPrefix
+setNotify_playCWCallsignsOnRxedPMs
+setNotify_playSimpleSounds
+setNotify_playVoiceCallsignsOnRxedPMs
+setStn_antennaBeamWidthDeg
+setStn_bandActive10G
+setStn_bandActive1240
+setStn_bandActive144
+setStn_bandActive2300
+setStn_bandActive3400
+setStn_bandActive432
+setStn_bandActive50
+setStn_bandActive5600
+setStn_bandActive70
+setStn_loginCallSign
+setStn_loginLocatorMainCat
+setStn_loginNameMainCat
+setStn_loginNameSecondCat
+setStn_loginPassword
+setStn_maxQRBDefault
+setStn_on4kstServersDns
+setStn_on4kstServersPort
+setStn_pathAnalysisDefaultTargetAntennaGainDbi
+setStn_pathAnalysisDefaultTargetTxPowerWatts
+setStn_pathAnalysisDemRootDirectory
+setStn_pathAnalysisOwnAntennaGainDbi
+setStn_pathAnalysisOwnAntennaHeightMeters
+setStn_pathAnalysisOwnTxPowerWatts
+setStn_pstRotatorEnabled
+setStn_pstRotatorHost
+setStn_pstRotatorPort
+setStn_qtfDefault
+setTrxSynch_ucxLogUDPListenerEnabled

app-desktop/src/test/resources/settings-foreign-writes.txt

@@ -0,0 +1,5 @@
+setCallSign
+setChatCategoryMain
+setChatCategorySecondChat
+setFrequency
+setQra