chore(ci): remove CodeSandbox CI configuration

[tristandubbeld]

Summary

Removes CodeSandbox CI from the repository. CodeSandbox CI was causing failures during yarn install because it didn't install zstd before running the postinstall script. Since CircleCI already handles CI/CD, CodeSandbox CI is redundant.

This error caused CodeSandbox CI to fail for a long time already.

Changes

• Removed .codesandbox/ci.json — CodeSandbox CI configuration file
• Reverted standalone-packages/vscode-extensions/package.json — Restored original decompress-extensions script (no longer needed since CodeSandbox CI is removed)

Why remove CodeSandbox CI?

• Redundant with CircleCI — CircleCI already provides full CI/CD coverage
• Caused CI failures — CodeSandbox CI didn't install zstd before yarn install, causing the vscode-extensions decompression step to fail
• Not blocking — CircleCI handles all necessary checks (build, test, lint, typecheck, deploy)

Testing

• CircleCI builds should continue to work as before
• CodeSandbox CI will no longer run on PRs

[codesandbox]

Review or Edit in CodeSandbox

Open the branch in Web Editor • VS Code • Insiders

Open Preview

• Application (fast + production)
• Application (fast + stream)