Fix json mode

[joshi4]

• fix(contracts): output well formed json from --json flag
• feat(cli): if json flag is specified do not display app banner or nudge users to upgrade

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
src/index.ts	50% smaller
src/lib/contracts/index.tsx	0% smaller

[greptile-apps]

PR Summary

This PR improves JSON output handling in the CLI by ensuring clean, well-formed JSON for the contracts list --json command and suppressing non-JSON output when using the --json flag.

• Modified src/lib/contracts/index.tsx to properly format JSON output using JSON.stringify with formatting parameters
• Added conditional check in src/index.ts to skip app banner and version check when --json flag is present
• Optimized listContracts function call to avoid duplicate execution
• Ensures machine-readable output suitable for programmatic consumption

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[sigmachirality]

can you run deno fmt rq? other lgtm

we may want to spend some time thinking about how to handle more cases of printing to output that we don't want to print in --json mode in a nice way in the future (like, a logger class/closure/object?)