feat: add language aliases for TUI syntax highlighting

[mocksoul]

Issue for this PR

Closes #12211

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds a LANGUAGE_ALIASES map to the TUI code block highlighter so that common code fence language names that don't have their own tree-sitter parser resolve to an existing one.

For example, jsonc now highlights as JSON, tsx as TypeScript, ```sh as Bash, etc.

18 aliases added: jsonc, json5, jsonl, sh, zsh, shell, c++, c#, yml, py, rb, rs, hs, js, jsx, ts, tsx, md.

How did you verify your code works?

Tested locally in TUI — code blocks with jsonc, jsx, tsx, sh and other aliased languages now render with proper syntax highlighting.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[mocksoul]

I guess CI failures are unrelated to this PR — two Windows e2e tests (prompt-async-prompt...endpoint-is-unreachable and prompt-can-send-a-prompt-and-receive-a-reply) fail on all retries. All other checks pass: unit, typecheck, e2e linux, nix-eval.