Fix system collection view fallback & Windows extension build

[Manas-5461X]

This PR addresses an issue where system collections (like "All Bookmarks") would revert to the default list view and ignore global user settings after a data refresh.

Changes:

• System Collection View Fix (items.js): Updated the defColls mapping to properly respect locally overridden views (item.view) and fall back to the global user.config.default_collection_view. Previously, the view was being dropped during loadCollections, causing it to fall back to the hardcoded list default during normalization.

• Windows Build Fix (build/extension.js): Tweaked the manifest/index.js regex to support both Windows (\) and Unix (/) directory separators. This prevents Webpack from mistakenly trying to bundle the manifest script for the browser on Windows (which was causing fs and path not found crashes).

Tested On

• Windows 11

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