Fix project name prompt placeholder leak

[tannerlinsley]

Summary

Fixes the interactive project-name prompt so pressing Enter for the current directory no longer lets the placeholder text leak into validation.

Details

The prompt used Clack's placeholder for the current-directory hint. In this edge case, the placeholder could be treated like input after Enter, then validated as a project name and duplicated in the prompt output. The hint now lives in the prompt message, and the project-name prompt no longer sets a placeholder.

Validation

• pnpm --filter @tanstack/cli test -- ui-prompts
• pnpm --filter @tanstack/cli build
• Commit hook: nx run-many --target=build --parallel 5
• Commit hook: pnpm test:unit && pnpm test:e2e

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• Commit unit tests in branch taren/fix-create-name-placeholder

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