remove retired apps from monorepo

[kilemensi]

Description

• Removed retired promisetracker app from the workspace.
• Removed retired uibook Storybook app and its repo references.
• Cleaned related workspace/lockfile entries and stale Storybook dependencies.
• Allowed Playwright app scripts to pass when an app has no e2e tests.

Motivation

promisetracker has been superseded by v2 in a separate repo, and uibook is no longer actively used as the shared component showcase. Keeping them in this monorepo adds CI/tooling maintenance cost without clear product value.

Removing uibook also avoids spending more time fixing its Storybook build only to delete it shortly after.

Type of change

• Chore

Screenshots

N/A

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[kilemensi]

@codex review