Add style selector and preferences shortcut to entry preview bottom bar

[Copilot]

The entry preview had no inline way to switch preview styles — users had to cycle blindly via keyboard shortcuts or navigate to preferences manually.

Changes

• PreviewPanel: Adds a bottom toolbar (HBox) to the preview VBox with:

  • A "Preview style" ComboBox (left) populated from previewPreferences.getLayoutCycle(), displaying each layout's getDisplayName(). Selecting an item immediately updates the active layout and persists the cycle position.
  • A preferences gear Button (right) that opens the JabRef preferences dialog directly to the Entry Preview tab via PreferencesDialogView(PreviewTab.class).
  • VBox.setVgrow(previewView, Priority.ALWAYS) keeps the toolbar pinned to the bottom.

• Sync logic: Bidirectional binding between the ComboBox and layoutCyclePositionProperty() — external position changes (keyboard cycling) update the ComboBox; ComboBox selection updates the position. A guard (selectedIndex != currentPosition) prevents feedback loops. After the preferences dialog closes, the preview layout is explicitly refreshed.

• JabRef_en.properties: Adds Preview style and Open preview preferences localization keys.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.foojay.io
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -Xmx6g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant (dns block)
• central.sonatype.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED --add-opens=java.base/java.time=ALL-UNNAMED -Xmx6g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant (dns block)
• files.jabref.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java -Xmx64m -Xms64m -Dorg.gradle.appname=gradlew -jar /home/REDACTED/work/jabref/jabref/gradle/wrapper/gradle-wrapper.jar :jabgui:compileJava --no-daemon -x test (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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