refactor(cli): replace styleText with picocolors

[liangmiQwQ]

Close #1947

This PR replaces JS CLI uses of node:util styleText with picocolors, matching Rust and Vite side's CI behavior.

It updates create, migrate, terminal, help, editor, agent, and tsconfig prompt formatting, plus the CLI output polish RFC reference.

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[liangmiQwQ]

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[liangmiQwQ]

@codex

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[chatgpt-codex-connector]

Preserve non-TTY color suppression

With the default picocolors export, color support is computed from environment variables and treats CI=true as color-capable even when stdout is not a TTY; styleText() previously returned plain text in that same non-TTY CI case unless color was explicitly forced. For invocations such as CI=true vp create ... > log without NO_COLOR, these shared helpers now inject ANSI escapes into captured output, which changes the documented no-behavior-change refactor and can break log/snapshot consumers. Consider creating a local colors wrapper with the previous stream/TTY gating instead of using the default export directly.

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[liangmiQwQ]

This does bring a behavior change, but I think it should be treated as an improvement.

In Rust side, we use owo_colors which emits ANSI chars, the same behavior as Vite, who has already used picocolors for a long time. So use default picocolors exports can help create more united mental model.

[fengmk2]

@liangmiQwQ may be worth adding a small regression snap test to check that imports the JS CLI entry under a Node version older than 20.12, since the original failure happens during module loading rather than command execution.

[liangmiQwQ]

Well... there are upstream dependencies using styleText (@clack/core), so this PR could not solve Node.js version problem.

So, the only tiny value this PR has left is #1950 (comment), I will modify the PR description, you can decide to close or merge this PR.

[1]> vp run hi
file://<homedir>/code/voidzero-dev/vite-plus/packages/cli/dist/tsconfig-YOTZAtzV.js:8
import { stripVTControlCharacters, styleText } from "node:util";
                                   ^^^^^^^^^
SyntaxError: The requested module 'node:util' does not provide an export named 'styleText'

Node.js v<semver>

[fengmk2]

@liangmiQwQ Just as I expected, after all, many of our dependencies no longer support older versions of Node.js.