Fix dependencies

[pasere-smeup]

This pull request primarily updates documentation and configuration files in the ketchup package. The main changes include clarifying callback type signatures in several README files, updating TypeScript configuration to skip library type checking, and removing an unused optional dependency.

Documentation updates (improving callback type signatures):

• Updated the callback type signatures for dateChange, delete, phaseDrop, and progressChange in both kup-gantt/readme.md and kup-grid-renderer/readme.md to consistently allow Promise<void> and Promise<boolean> return types in any order. Also, fixed the argument order for the eventStart callback. [1] [2] [3]

Configuration changes:

• Added "skipLibCheck": true to tsconfig.json to speed up TypeScript builds by skipping type checking of library files.

Dependency cleanup:

• Removed the unused canvas package from optionalDependencies in package.json.