Fix NPE race condition in AssistantChat.updateLoading

[Copilot]

updateLoading checked handle != null on the calling thread, but stopLoading() could null out handle before the scheduled invokeLater lambda executed on the EDT, causing a NPE at handle.setDisplayName(progress).

Change

• Added a null guard for handle inside the invokeLater lambda in updateLoading, so a concurrent stopLoading() call between scheduling and execution is handled safely.

// Before
SwingUtilities.invokeLater(() -> {
    handle.setDisplayName(progress); // NPE if stopLoading() ran before this
});

// After
SwingUtilities.invokeLater(() -> {
    if (handle != null) {
        handle.setDisplayName(progress);
    }
});

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:

• www.netbeans.org
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/tools/linux64/java/bin/java /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.24.3/x64/codeql/xml/tools/xml-extractor.jar --fileList=/tmp/codeql-scratch-cd61c9847ee61009/dbs/java/working/files-to-index17235296391050999240.list --sourceArchiveDir=/tmp/codeql-scratch-cd61c9847ee61009/dbs/java/src --outputDir=/tmp/codeql-scratch-cd61c9847ee61009/dbs/java/trap/java (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
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