Community-code notice on pg mod + moddable prompt defaults to yes

[UtkarshBhardwaj007]

What

Two small UX changes:

1. playground mod community-code notice. A light warning-tone callout now appears before any app source touches the user's machine:

   • above the app list in the interactive picker
   • on the setup screen for the direct playground mod <domain> path (which skips the picker but still downloads and runs the app's setup.sh)

   The copy follows the marketplace-standard register (community-published, not reviewed, use at your own risk) and is deliberately specific about the real exposure point: modding runs the app's setup script locally. It is a notice, not a gate; setup.sh still runs automatically.

   ╭──────────────────────────────────────────────────────────────────────────╮
   │ Community Code                                                           │
   │ Apps here are open source, published by the community, and not reviewed. │
   │ Modding downloads the source and runs its setup script on your machine.  │
   │ Review anything you don't trust first and use at your own risk.          │
   ╰──────────────────────────────────────────────────────────────────────────╯
   

   The copy lives in one module (src/commands/mod/communityNotice.ts) so both screens stay identical. The picker's viewport math reserves rows for the box so tall lists don't overflow the terminal.

2. playground deploy moddable prompt defaults to yes. The cursor on "make this app moddable?" now starts on "yes", so plain Enter opts in. First slice of the moddable-by-default work (Moddable-by-default deploy + guided GitHub login & repo creation flow #200); the graceful handling of a missing GitHub origin is a follow-up.

Verification

• pnpm format:check, pnpm lint:license, pnpm build, pnpm test (579 tests) all pass
• Callout rendering visually confirmed via a standalone Ink render

Changeset included.

[github-actions]

Dev build ready — try this branch:

curl -fsSL https://raw.githubusercontent.com/paritytech/playground-cli/main/install.sh | VERSION=dev/feat/mod-community-notice bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: feat/mod-community-notice · Commit: 957627b · Run logs

Cell	Result	Time
pr-install	✅ PASS	0m42s
pr-deploy-cdm	✅ PASS	4m07s
pr-init-session	✅ PASS	2m19s
pr-mod	✅ PASS	1m16s
pr-preflight	✅ PASS	2m23s
pr-deploy-frontend	✅ PASS	9m13s
pr-deploy-foundry	✅ PASS	0m40s
${{ matrix.cell }}	⏭️ SKIP	0m00s
${{ matrix.cell }}	⏭️ SKIP	0m00s

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