BridgeJS: Emit static members in declare global class declarations

[krodak]

Overview

Static members of a globally-exposed @JS(namespace:) class were rendered incorrectly in the generated declare global { namespace ... } TypeScript declarations: every method was emitted without static, and properties were filtered to instance-only. As a result a @JS static func was typed as an instance method and a @JS static var was dropped from the .d.ts entirely.

This is a type-only defect. The emitted JavaScript already exposes these members statically (and the class's namespace export entry types them correctly), so the runtime behavior is unaffected and only TypeScript consumers were impacted: static access such as MyNamespace.MyClass.makeDefault() would not type-check even though the call works at runtime. We found it now, as we have tsc --noEmit check over consumer code.

The fix splits static and instance members in this path, emitting static methods with static and including static properties (with static/readonly as appropriate).

Before / after

// before
class Greeter {
    constructor(name: string);
    greet(): string;
    makeDefault(): Greeter;   // wrongly typed as instance, defaultGreeting missing
    release(): void;
}

// after
class Greeter {
    constructor(name: string);
    greet(): string;
    static makeDefault(): Greeter;
    static readonly defaultGreeting: string;
    release(): void;
}