Deconstruct VncThumbnailViewer 1.4.2 and add self-contained build

The shipped VncThumbnailViewerWin1.4.2.exe is a native launcher stub with a
Java JAR appended. This commit adds:

- src/: full Java source recovered from the bundled .class files (CFR),
  plus src/summary.txt with decompiler caveats
- ANALYSIS.md: architecture, data flow, hosts-file format, and security notes
- build-app-image.ps1: reproducible jpackage build that repackages the
  original classes and bundles a slim jlinked runtime (java.base + java.desktop)
  into a self-contained native app-image (no Java required on the target)

The 74 MB app-image is shipped as a release asset rather than tracked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/AuthPanel.java

@@ -0,0 +1,76 @@
+/*
+ * Decompiled with CFR 0.152.
+ */
+import java.awt.Button;
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+import java.awt.Label;
+import java.awt.Panel;
+import java.awt.TextField;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+class AuthPanel
+extends Panel
+implements ActionListener {
+    TextField passwordField;
+    Button okButton;
+
+    public AuthPanel(VncViewer vncViewer) {
+        Label label = new Label("VNC Authentication", 1);
+        label.setFont(new Font("Helvetica", 1, 18));
+        Label label2 = new Label("Password:", 1);
+        this.passwordField = new TextField(10);
+        this.passwordField.setForeground(Color.black);
+        this.passwordField.setBackground(Color.white);
+        this.passwordField.setEchoChar('*');
+        this.okButton = new Button("OK");
+        GridBagLayout gridBagLayout = new GridBagLayout();
+        GridBagConstraints gridBagConstraints = new GridBagConstraints();
+        this.setLayout(gridBagLayout);
+        gridBagConstraints.gridwidth = 0;
+        gridBagConstraints.insets = new Insets(0, 0, 20, 0);
+        gridBagLayout.setConstraints(label, gridBagConstraints);
+        this.add(label);
+        gridBagConstraints.fill = 0;
+        gridBagConstraints.gridwidth = 1;
+        gridBagConstraints.insets = new Insets(0, 0, 0, 0);
+        gridBagLayout.setConstraints(label2, gridBagConstraints);
+        this.add(label2);
+        gridBagLayout.setConstraints(this.passwordField, gridBagConstraints);
+        this.add(this.passwordField);
+        this.passwordField.addActionListener(this);
+        gridBagConstraints.gridwidth = 0;
+        gridBagConstraints.fill = 1;
+        gridBagConstraints.insets = new Insets(0, 20, 0, 0);
+        gridBagConstraints.ipadx = 30;
+        gridBagLayout.setConstraints(this.okButton, gridBagConstraints);
+        this.add(this.okButton);
+        this.okButton.addActionListener(this);
+    }
+
+    public void moveFocusToDefaultField() {
+        this.passwordField.requestFocus();
+    }
+
+    public synchronized void actionPerformed(ActionEvent actionEvent) {
+        if (actionEvent.getSource() == this.passwordField || actionEvent.getSource() == this.okButton) {
+            this.passwordField.setEnabled(false);
+            this.notify();
+        }
+    }
+
+    public synchronized String getPassword() throws Exception {
+        try {
+            this.wait();
+        }
+        catch (InterruptedException interruptedException) {
+            // empty catch block
+        }
+        return this.passwordField.getText();
+    }
+}
+