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.

.github/workflows/nightly-artifacts.yml

@@ -52,39 +52,23 @@ jobs:
         shell: pwsh
         run: choco install wixtoolset --no-progress -y
 
-      - name: Build JAR and copy runtime dependencies
-        shell: pwsh
-        run: |
-          .\gradlew.bat -S :app-desktop:collectRuntime
-          $jar = Get-ChildItem -Path target -Filter 'praktiKST-*.jar' | Sort-Object LastWriteTime -Descending | Select-Object -First 1
-          if (-not $jar) {
-            throw "No project JAR produced"
-          }
-          Copy-Item $jar.FullName app-desktop/build/dist-libs/app.jar
-
-      - name: Build app-image with jpackage
+      - name: Build app-image
         shell: pwsh
         run: |
+          .\gradlew.bat -S :app-desktop:createDistributable
           New-Item -ItemType Directory -Force -Path dist | Out-Null
-          $addModules = (Select-String -Path gradle.properties -Pattern '^jpackageAddModules=').Line.Split('=')[1]
-          if ($LASTEXITCODE -ne 0) { throw "Failed to resolve --add-modules from module-info.java" }
-          jpackage `
-            --type app-image `
-            --name praktiKST `
-            --icon packaging/icons/kst4contest.ico `
-            --input app-desktop/build/dist-libs `
-            --main-jar app.jar `
-            --main-class kst4contest.view.Main `
-            --add-modules $addModules `
-            --dest dist
+          # The next step reads dist/KST4Contest, so the Compose output goes
+          # there. The module list now lives in app-desktop/build.gradle.kts.
+          if (Test-Path dist/KST4Contest) { Remove-Item -Recurse -Force dist/KST4Contest }
+          Copy-Item -Recurse app-desktop/build/compose/binaries/main/app/KST4Contest dist/KST4Contest
 
       - name: Create Windows ZIP
         shell: pwsh
         run: |
-          if (-not (Test-Path dist/praktiKST)) {
-            throw "No Windows app-image produced by jpackage"
+          if (-not (Test-Path dist/KST4Contest)) {
+            throw "No Windows app-image produced by createDistributable"
           }
-          Compress-Archive -Path dist/praktiKST -DestinationPath "dist/$env:ASSET_BASENAME-windows-x64.zip" -Force
+          Compress-Archive -Path dist/KST4Contest -DestinationPath "dist/$env:ASSET_BASENAME-windows-x64.zip" -Force
 
       - name: Upload Windows artifact
         uses: actions/upload-artifact@v4.3.4
@@ -116,23 +100,14 @@ jobs:
       - name: Ensure gradlew is executable
         run: chmod +x gradlew
 
-      - name: Build JAR and copy runtime dependencies
-        run: |
-          ./gradlew -S :app-desktop:collectRuntime
-
-      - name: Build app-image with jpackage
+      - name: Build app-image
         run: |
+          ./gradlew -S :app-desktop:createDistributable
           mkdir -p dist
-          ADD_MODULES="$(grep -m1 '^jpackageAddModules=' gradle.properties | cut -d= -f2)"
-          jpackage \
-            --type app-image \
-            --name KST4Contest \
-            --icon packaging/icons/kst4contest.png \
-            --input app-desktop/build/dist-libs \
-            --main-jar app.jar \
-            --main-class kst4contest.view.Main \
-            --add-modules "$ADD_MODULES" \
-            --dest dist
+          # The following steps read dist/KST4Contest, so the Compose output goes
+          # there. The module list now lives in app-desktop/build.gradle.kts.
+          rm -rf dist/KST4Contest
+          cp -a app-desktop/build/compose/binaries/main/app/KST4Contest dist/
 
       - name: Create AppDir metadata
         run: |
@@ -203,27 +178,13 @@ jobs:
       - name: Ensure gradlew is executable
         run: chmod +x gradlew
 
-      - name: Build JAR and copy runtime dependencies
-        run: |
-          ./gradlew -S :app-desktop:collectRuntime
-
       - name: Build Debian package
         run: |
+          ./gradlew -S :app-desktop:packageDeb
           mkdir -p dist
-          ADD_MODULES="$(grep -m1 '^jpackageAddModules=' gradle.properties | cut -d= -f2)"
-          jpackage \
-            --type deb \
-            --name KST4Contest \
-            --icon packaging/icons/kst4contest.png \
-            --input app-desktop/build/dist-libs \
-            --main-jar app.jar \
-            --main-class kst4contest.view.Main \
-            --add-modules "$ADD_MODULES" \
-            --linux-package-deps "libgstreamer1.0-0,libgstreamer-plugins-base1.0-0,gstreamer1.0-plugins-good" \
-            --dest dist
-          DEB="$(ls dist/*.deb | head -n 1)"
+          DEB="$(ls app-desktop/build/compose/binaries/main/deb/*.deb | head -n 1)"
           if [ -z "$DEB" ]; then
-            echo "No DEB produced by jpackage" && exit 1
+            echo "No DEB produced by packageDeb" && exit 1
           fi
           mv "$DEB" "dist/${ASSET_BASENAME}-debian-amd64.deb"
 
@@ -262,27 +223,13 @@ jobs:
       - name: Ensure gradlew is executable
         run: chmod +x gradlew
 
-      - name: Build JAR and copy runtime dependencies
-        run: |
-          ./gradlew -S :app-desktop:collectRuntime
-
       - name: Build Fedora package
         run: |
+          ./gradlew -S :app-desktop:packageRpm
           mkdir -p dist
-          ADD_MODULES="$(grep -m1 '^jpackageAddModules=' gradle.properties | cut -d= -f2)"
-          jpackage \
-            --type rpm \
-            --name KST4Contest \
-            --icon packaging/icons/kst4contest.png \
-            --input app-desktop/build/dist-libs \
-            --main-jar app.jar \
-            --main-class kst4contest.view.Main \
-            --add-modules "$ADD_MODULES" \
-            --linux-package-deps "gstreamer1,gstreamer1-plugins-base,gstreamer1-plugins-good" \
-            --dest dist
-          RPM="$(ls dist/*.rpm | head -n 1)"
+          RPM="$(ls app-desktop/build/compose/binaries/main/rpm/*.rpm | head -n 1)"
           if [ -z "$RPM" ]; then
-            echo "No RPM produced by jpackage" && exit 1
+            echo "No RPM produced by packageRpm" && exit 1
           fi
           mv "$RPM" "dist/${ASSET_BASENAME}-fedora-x86_64.rpm"
 
@@ -323,23 +270,14 @@ jobs:
       - name: Ensure gradlew is executable
         run: chmod +x gradlew
 
-      - name: Build JAR and copy runtime dependencies
-        run: |
-          ./gradlew -S :app-desktop:collectRuntime
-
-      - name: Build app-image with jpackage
+      - name: Build app-image
         run: |
+          ./gradlew -S :app-desktop:createDistributable
           mkdir -p dist
-          ADD_MODULES="$(grep -m1 '^jpackageAddModules=' gradle.properties | cut -d= -f2)"
-          jpackage \
-            --type app-image \
-            --name KST4Contest \
-            --icon packaging/icons/kst4contest.png \
-            --input app-desktop/build/dist-libs \
-            --main-jar app.jar \
-            --main-class kst4contest.view.Main \
-            --add-modules "$ADD_MODULES" \
-            --dest dist
+          # The following steps read dist/KST4Contest, so the Compose output goes
+          # there. The module list now lives in app-desktop/build.gradle.kts.
+          rm -rf dist/KST4Contest
+          cp -a app-desktop/build/compose/binaries/main/app/KST4Contest dist/
 
       - name: Build Arch Linux package artifact
         run: |
@@ -445,20 +383,13 @@ jobs:
           flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
           flatpak --user install -y flathub org.freedesktop.Platform//24.08 org.freedesktop.Sdk//24.08
 
-      - name: Build app-image with jpackage
+      - name: Build app-image
         run: |
-          ./gradlew -S :app-desktop:collectRuntime
+          ./gradlew -S :app-desktop:createDistributable
           mkdir -p target/flatpak-src
-          ADD_MODULES="$(grep -m1 '^jpackageAddModules=' gradle.properties | cut -d= -f2)"
-          jpackage \
-            --type app-image \
-            --name KST4Contest \
-            --icon packaging/icons/kst4contest.png \
-            --input app-desktop/build/dist-libs \
-            --main-jar app.jar \
-            --main-class kst4contest.view.Main \
-            --add-modules "$ADD_MODULES" \
-            --dest target/flatpak-src
+          # The manifest's source is flatpak-src/KST4Contest.
+          rm -rf target/flatpak-src/KST4Contest
+          cp -a app-desktop/build/compose/binaries/main/app/KST4Contest target/flatpak-src/
 
       - name: Create Flatpak manifest
         run: |