Open same-page launchers without navigation

[tataihono]

Summary

• intercept same-page launcher links and open the global launcher directly in client state
• keep the current URL and document position unchanged
• remove the scroll-restoration workaround
• retain URL-driven launcher handling for shared and directly opened links

Verification

• pnpm exec vitest run src/components/launcher/NextStepsLauncher.test.tsx
• pnpm exec eslint src/components/launcher/NextStepsLauncher.tsx src/components/launcher/NextStepsLauncher.test.tsx
• railway run --service website --environment production -- pnpm build