WRNexusJS 0.4.0 lint fix

Extract this archive into the WRNexusJS repository root and replace the included files.

Fixes:

• Removes the no-useless-assignment failure in the CAPTCHA page-grant endpoint.
• Restores the Button showcase's specialized examples so buttonUses is used.
• Declares browser globals for the package-owned CAPTCHA runtime.
• Replaces empty catch blocks with documented best-effort cleanup.
• Fixes prefer-const in package discovery.
• Removes unused plugin, style-audit, and UI-test bindings.
• Uses the UI-reference verifier in the release workflow.
• Declares Node globals correctly in installer and validation scripts.

Run:

bun run lint
bun run validate:0.4