Remove unused MiniKiosk from action settings

[soamdesai-tfh]

Summary

• remove the unreachable embedded MiniKiosk from V2 and V3 action Settings
• simplify both TryAction views to render the existing integration code directly
• preserve the full navigable Kiosk route, navigation, and shared Kiosk implementation

Why

Every current TryAction callsite passed enableKiosk={false}, so users could never open the embedded preview. Its static imports still placed IDKit and QR rendering in the Settings client graph.

MiniKiosk was intentionally disabled in #1962 because it used a mock RP signature that World App could not trust. Re-enabling it would require a server-side RP-signing flow.

The production manifest now excludes the runtime IDKit chunk (110.1 KB parsed / 30.3 KB gzip) and react-qr-code chunk (25.9 KB parsed / 9.4 KB gzip) from action Settings. Including deleted route-local code, the bundle-audit estimate is about 144 KB parsed / 41.7 KB gzip removed from initial Settings JS.

User impact

• code samples remain unchanged
• the unused view switcher, including its always-selected Code icon, is removed
• legacy cloud actions still reach Kiosk through the action's Kiosk tab
• the full Kiosk retains IDKit and QR rendering
• on-chain Kiosk availability is unchanged

Validation

• pnpm format:check
• npx tsc --noEmit
• npx jest tests/unit lib/schema --maxWorkers=2 --no-cache — 79 suites, 367 tests passed
• pnpm build using the repository's documented dummy build-time values
• compiled client-manifest assertions:
  • Settings excludes runtime IDKit and react-qr-code
  • full Kiosk retains runtime IDKit and react-qr-code
  • Profile retains runtime IDKit