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.

gradle.properties

@@ -1,10 +1,8 @@
 version=1.50.0-nightly
+# nativeDistributions requires MAJOR.MINOR.PATCH with digits only. MSI and DMG
+# reject a qualifier, so the nightly suffix from `version` cannot be used here.
+composePackageVersion=1.50.0
 group=de.x08
-# Runtime modules jlink must keep. Derived from the former module-info.java
-# requires clauses, minus javafx.* (JavaFX now comes from the classpath) and
-# plus jdk.unsupported, which javafx.graphics used to pull in transitively.
-# Single source for the Gradle build, the workflows and the AUR PKGBUILDs.
-jpackageAddModules=java.desktop,java.net.http,java.sql,jdk.crypto.ec,jdk.jsobject,jdk.net,jdk.xml.dom,jdk.unsupported
 
 org.gradle.parallel=true
 org.gradle.caching=true