[Security] Mask SHOPIFY_API_SECRET in CLI output

[gonzaloriestra]

WHY are these changes introduced?

To improve security by preventing sensitive API secrets from being displayed in cleartext in the console output.

WHAT is this pull request doing?

• Introduces outputToken.mask utility in cli-kit for redacting sensitive values.
• Masks SHOPIFY_API_SECRET in app env show (text format).
• Masks SHOPIFY_API_SECRET in app env pull console output, including file content previews and diff context.

How to test your changes?

shopify app env show
shopify app env pull

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

---

PR created automatically by Jules for task 18035476117825723708 started by @gonzaloriestra

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[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/private/node/content-tokens.d.ts

@@ -42,4 +42,7 @@ export declare class SubHeadingContentToken extends ContentToken<OutputMessage>
 }
 export declare class ItalicContentToken extends ContentToken<OutputMessage> {
     output(): string;
+}
+export declare class MaskContentToken extends ContentToken<string> {
+    output(): string;
 }
\ No newline at end of file

packages/cli-kit/dist/public/node/output.d.ts

@@ -1,7 +1,7 @@
 import { PackageManager } from './node-package-manager.js';
 import { AbortSignal } from './abort.js';
 import { TokenItem } from './ui.js';
-import { ColorContentToken, CommandContentToken, ContentToken, ErrorContentToken, HeadingContentToken, ItalicContentToken, JsonContentToken, LinesDiffContentToken, LinkContentToken, PathContentToken, RawContentToken, SubHeadingContentToken } from '../../private/node/content-tokens.js';
+import { ColorContentToken, CommandContentToken, ContentToken, ErrorContentToken, HeadingContentToken, ItalicContentToken, JsonContentToken, LinesDiffContentToken, LinkContentToken, MaskContentToken, PathContentToken, RawContentToken, SubHeadingContentToken } from '../../private/node/content-tokens.js';
 import { Writable } from 'stream';
 import type { Change } from 'diff';
 export type Logger = Writable | ((message: string, logLevel?: LogLevel) => void);
@@ -29,6 +29,7 @@ export declare const outputToken: {
     successIcon(): ColorContentToken;
     failIcon(): ErrorContentToken;
     linesDiff(value: Change[]): LinesDiffContentToken;
+    mask(value: string): MaskContentToken;
 };
 /**
  * Given a command and its arguments, it formats it depending on the package manager.