Fix JavaDoc snippet validator and the snippets it surfaced

The headless snippet validator stopped catching real issues after a
chain of refactors: PlaygroundProjectExporter pulled in net.sf.zipme.*
breaking the harness build, the resolveDisplayBinding wrappers were
reverted out of PlaygroundRunner.bindGlobals so it tripped on
ExceptionInInitializerError, and CN1's Base64 grew a Simd dep that
forced Display.impl to be live before any encoding could happen.

Repairs:
- Add ZipSupport cn1lib to the harness classpath
- Restore resolveDisplay/UiManagerBinding in PlaygroundRunner
- Encode URIs via java.util.Base64 instead of reflecting into CN1's
- Best-effort Display.init from the locally-built JavaSE jar so
  "Undefined argument: icon" surfaces instead of an NPE
- Tighten the harness so undefined-identifier eval errors fail,
  while genuine headless-runtime failures still pass

Then fix the snippets the now-working validator flags:
- SpanLabel/SpanButton/MultiButton/CheckBox/RadioButton/ButtonGroup/
  Label/ImageViewer: add the missing Form/Image setup and hi.show()
- Preferences (and io/package-info copy): declare String myToken
- MathUtil.compare(float|double): turn the bare compareTo line into
  a runnable Form demo
- Component.getAllStyles / Graphics.fillArc: rewrite the broken
  "new Painter(cmp) { switch (style) ... }" pseudo-code (Painter is
  an interface; style/cmp were undefined) as a runnable Painter demo
- Validator: wrap the Constraint sample in a runnable Form
- system/package-info: relabel the Objective-C example block from
  java to objc
- Add the four genuinely-illustrative GroupLayout/LayoutStyle method-
  signature snippets to the exclusions list with documented reasons

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: shai-almog

CodenameOne/src/com/codename1/components/ImageViewer.java

@@ -47,8 +47,10 @@
 ///
 /// ```java
 /// Form hi = new Form("ImageViewer", new BorderLayout());
+/// Image duke = FontImage.createMaterial(FontImage.MATERIAL_INFO, "Label", 3.0f);
 /// ImageViewer iv = new ImageViewer(duke);
 /// hi.add(BorderLayout.CENTER, iv);
+/// hi.show();
 /// ```
 ///
 /// You can simulate pinch to zoom on the simulator by dragging the right button away from the top left corner to

CodenameOne/src/com/codename1/components/MultiButton.java

@@ -50,6 +50,11 @@
 /// a lead component. Up to 4 rows are supported.
 ///
 /// ```java
+/// Form hi = new Form("Test MultiButton", BoxLayout.y());
+///
+/// Image icon = FontImage.createMaterial(FontImage.MATERIAL_INFO, "Button", 3.0f);
+/// Image emblem = FontImage.createMaterial(FontImage.MATERIAL_ARROW_FORWARD, "Button", 3.0f);
+///
 /// MultiButton twoLinesNoIcon = new MultiButton("MultiButton");
 /// twoLinesNoIcon.setTextLine2("Line 2");
 /// MultiButton oneLineIconEmblem = new MultiButton("Icon + Emblem");
@@ -83,6 +88,7 @@
 ///         add(twoLinesIconEmblemHorizontal).
 ///         add(twoLinesIconCheckBox).
 ///         add(fourLinesIcon);
+/// hi.show();
 /// ```
 ///
 /// @author Shai Almog

CodenameOne/src/com/codename1/components/SpanButton.java

@@ -49,9 +49,14 @@
 /// button has the UIID style of a button.
 ///
 /// ```java
+/// Form hi = new Form("Test SpanButton", BoxLayout.y());
+///
+/// Image icon = FontImage.createMaterial(FontImage.MATERIAL_INFO, "Button", 3.0f);
+///
 /// SpanButton sb = new SpanButton("SpanButton is a composite component (lead component) that looks/acts like a Button but can break lines rather than crop them when the text is very long.");
 /// sb.setIcon(icon);
 /// hi.add(sb);
+/// hi.show();
 /// ```
 ///
 /// @author Shai Almog

CodenameOne/src/com/codename1/components/SpanLabel.java

@@ -44,6 +44,10 @@
 /// on a text area combined with a label.
 ///
 /// ```java
+/// Form hi = new Form("Test SpanLabel", BoxLayout.y());
+///
+/// Image icon = FontImage.createMaterial(FontImage.MATERIAL_INFO, "Label", 3.0f);
+///
 /// SpanLabel d = new SpanLabel("Default SpanLabel that can seamlessly line break when the text is really long.");
 /// d.setIcon(icon);
 /// SpanLabel l = new SpanLabel("NORTH Positioned Icon SpanLabel that can seamlessly line break when the text is really long.");
@@ -56,6 +60,7 @@
 /// c.setIcon(icon);
 /// c.setIconPosition(BorderLayout.EAST);
 /// hi.add(d).add(l).add(r).add(c);
+/// hi.show();
 /// ```
 ///
 /// @author Shai Almog

CodenameOne/src/com/codename1/io/Preferences.java

@@ -35,6 +35,7 @@
 ///
 /// ```java
 /// // save a token to storage
+/// String myToken = "abc123";
 /// Preferences.set("token", myToken);
 ///
 /// // get the token from storage or null if it isn't there

CodenameOne/src/com/codename1/io/package-info.java

@@ -58,6 +58,7 @@
 ///
 /// ```java
 /// // save a token to storage
+/// String myToken = "abc123";
 /// Preferences.set("token", myToken);
 ///
 /// // get the token from storage or null if it isn't there

CodenameOne/src/com/codename1/system/package-info.java

@@ -63,7 +63,7 @@
 /// combined where the "." elements are replaced by underscores. This class can be implemented in Objective-C
 /// (by providing both a header and an "m" file) or in Swift. Objective-C classes follow this convention e.g.:
 ///
-/// ```java
+/// ```objc
 /// @interface com_my_code_MyNative : NSObject {
 /// }
 /// - (id)init;

CodenameOne/src/com/codename1/ui/ButtonGroup.java

@@ -36,6 +36,10 @@
 /// the specific `ButtonGroup`.
 ///
 /// ```java
+/// Form hi = new Form("Test ButtonGroup", BoxLayout.y());
+///
+/// Image icon = FontImage.createMaterial(FontImage.MATERIAL_INFO, "CheckBox", 3.0f);
+///
 /// CheckBox cb1 = new CheckBox("CheckBox No Icon");
 /// cb1.setSelected(true);
 /// CheckBox cb2 = new CheckBox("CheckBox With Icon", icon);
@@ -49,6 +53,7 @@
 /// new ButtonGroup(rb1, rb2, rb3);
 /// rb2.setSelected(true);
 /// hi.add(cb1).add(cb2).add(cb3).add(cb4).add(rb1).add(rb2).add(rb3);
+/// hi.show();
 /// ```
 ///
 /// @author Nir Shabi

CodenameOne/src/com/codename1/ui/CheckBox.java

@@ -38,6 +38,10 @@
 /// mode using the `com.codename1.ui.Button#setToggle(boolean)` API.
 ///
 /// ```java
+/// Form hi = new Form("Test CheckBox", BoxLayout.y());
+///
+/// Image icon = FontImage.createMaterial(FontImage.MATERIAL_INFO, "CheckBox", 3.0f);
+///
 /// CheckBox cb1 = new CheckBox("CheckBox No Icon");
 /// cb1.setSelected(true);
 /// CheckBox cb2 = new CheckBox("CheckBox With Icon", icon);
@@ -51,6 +55,7 @@
 /// new ButtonGroup(rb1, rb2, rb3);
 /// rb2.setSelected(true);
 /// hi.add(cb1).add(cb2).add(cb3).add(cb4).add(rb1).add(rb2).add(rb3);
+/// hi.show();
 /// ```
 ///
 /// @author Chen Fishbein

CodenameOne/src/com/codename1/ui/Component.java

@@ -692,50 +692,29 @@ public Object getNativeOverlay() {
     /// style will be meaningless and will return 0 values. Usage:
     ///
     /// ```java
-    /// Painter p = new Painter(cmp) {
+    /// Form hi = new Form("Painter via getAllStyles", new BorderLayout());
+    /// Container cmp = new Container();
+    /// cmp.setPreferredSize(new Dimension(300, 300));
+    /// Painter p = new Painter() {
     ///     public void paint(Graphics g, Rectangle rect) {
     ///         boolean antiAliased = g.isAntiAliased();
     ///         g.setAntiAliased(true);
-    ///         int r = Math.min(rect.getWidth(), rect.getHeight())/2;
-    ///         int x = rect.getX() + rect.getWidth()/2 - r;
-    ///         int y = rect.getY() + rect.getHeight()/2 - r;
-    ///         switch (style) {
-    ///             case CircleButtonStrokedDark:
-    ///             case CircleButtonStrokedLight: {
-    ///                 if (cmp.getStyle().getBgTransparency() != 0) {
-    ///                     int alpha = cmp.getStyle().getBgTransparency();
-    ///                     if (alpha <0) {
-    ///                         alpha = 0xff;
-    ///                     }
-    ///                     g.setColor(cmp.getStyle().getBgColor());
-    ///                     g.setAlpha(alpha);
-    ///                     g.fillArc(x, y, 2*r-1, 2*r-1, 0, 360);
-    ///                     g.setAlpha(0xff);
-    ///                 }
-    ///                 g.setColor(cmp.getStyle().getFgColor());
-    ///                 g.drawArc(x, y, 2*r-1, 2*r-1, 0, 360);
-    ///                 break;
-    ///             }
-    ///             case CircleButtonFilledDark:
-    ///             case CircleButtonFilledLight:
-    ///             case CircleButtonTransparentDark:
-    ///             case CircleButtonTransparentLight: {
-    ///                 int alpha = cmp.getStyle().getBgTransparency();
-    ///                 if (alpha < 0) {
-    ///                     alpha = 0xff;
-    ///                 }
-    ///                 g.setAlpha(alpha);
-    ///                 g.setColor(cmp.getStyle().getBgColor());
-    ///                 g.fillArc(x, y, 2*r, 2*r, 0, 360);
-    ///                 g.setAlpha(0xff);
-    ///                 break;
-    ///             }
-    ///         }
-    ///
+    ///         int r = Math.min(rect.getWidth(), rect.getHeight()) / 2;
+    ///         int x = rect.getX() + rect.getWidth() / 2 - r;
+    ///         int y = rect.getY() + rect.getHeight() / 2 - r;
+    ///         g.setColor(cmp.getStyle().getBgColor());
+    ///         g.fillArc(x, y, 2 * r, 2 * r, 0, 360);
+    ///         g.setColor(cmp.getStyle().getFgColor());
+    ///         g.drawArc(x, y, 2 * r - 1, 2 * r - 1, 0, 360);
     ///         g.setAntiAliased(antiAliased);
     ///     }
     /// };
+    /// cmp.getAllStyles().setBgColor(0x4488ff);
+    /// cmp.getAllStyles().setBgTransparency(255);
+    /// cmp.getAllStyles().setFgColor(0xffffff);
     /// cmp.getAllStyles().setBgPainter(p);
+    /// hi.add(BorderLayout.CENTER, cmp);
+    /// hi.show();
     /// ```
     ///
     /// #### Returns