fix(tasks): adjust styles watcher implementation

[Hugoer]

This PR fixes an issue with SCSS file watchers caused by Chokidar version > 3. In versions 4+, Chokidar no longer supports glob patterns directly.

Description

Downgraded chokidar from v5 to v4 to maintain NC FE Build compatibility (node version).

Use fast-glob to have the observer pre-filter the SCSS files and listen only to the specific list of files., instead of monitoring the entire ${config.general.sourcesPath} folder. This ensures reliable detection of SCSS changes and improves watcher performance.

Related Issue

Fixes #138

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• All new and existing tests passed.