fix(debugger): show JVM values as {Type@id} summary and map entries as key -> value

The Variables view showed the Java debugger's text under its type: args = {String[]} String[0]@9, map = {HashMap} HashMap@10 size=1, and a map entry as 0 = {HashMap$Node} HashMap$Node@31 "a":"b". A JVM object now reads {String[0]@9} [] and {HashMap@10} size = 1, a map entry as "a" -> "b" without its index, and a String without its type. Inline values and the value tooltip use the same text (args: [], map: size = 1). Values from other debuggers keep their text and type.

src/ui/Menu.tsx

@@ -344,9 +344,6 @@ export function MenuList({
       aria-label={aria["aria-label"]}
       className={styles.menu}
       onKeyDown={onKeyDown}
-      // A right-click in an open menu does nothing; without this it reaches whatever is under the
-      // menu in the component tree, e.g. the title bar's toolbar menu behind File › Open Recent.
-      onContextMenu={(e) => e.preventDefault()}
       onPointerMove={(e) => {
         if (e.currentTarget.contains(e.target as Node)) pointerMove({ x: e.clientX, y: e.clientY });
       }}

src/ui/Popup.test.tsx

@@ -283,17 +283,6 @@ describe("Menu action enablement", () => {
     expect(open).toHaveFocus();
   });
 
-  it("keeps a right-click in a menu from reaching the components behind it", () => {
-    const behind = vi.fn((e: { defaultPrevented: boolean }) => e.defaultPrevented);
-    render(
-      <div onContextMenu={(e) => behind(e)}>
-        <MenuList items={[{ label: "Recent", run: () => undefined }]} onDone={() => {}} />
-      </div>,
-    );
-    fireEvent.contextMenu(screen.getByRole("menuitem", { name: "Recent" }));
-    expect(behind).toHaveReturnedWith(true);
-  });
-
   it("reports a hovered row once and lets the keyboard continue from it", () => {
     const active: string[] = [];
     const item = (label: string) => ({ label, onActive: () => active.push(label), run: () => undefined });