Detect package manager for create app add

[Tomeshwari-02]

Summary

• Detect the package manager for create-termui-app add from project lockfiles
• Use npm install by default instead of requiring bun
• Add coverage for npm fallback, bun.lock, and pnpm-lock.yaml flows

Fixes #1977

Testing

• Not run: Bun is not installed in this environment

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8f2b2bee-79f3-4f81-8404-a776845c266c

📥 Commits

Reviewing files that changed from the base of the PR and between 5f479e6 and fcb15f1.

📒 Files selected for processing (2)

• packages/create-termui-app/src/commands/add.test.ts
• packages/create-termui-app/src/commands/add.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Hi @Tomeshwari-02 👋

⭐ Star this repo before your PR merges.

Why? GSSoC 2026 contributors who star get priority review and points credit. After you star, push any commit (or re-run this check). The needs-star label lifts automatically.

Thanks for your contribution to TermUI.