Gitlab GUI Improvements

A collection of improvements for GitLab's UI. The first (and currently only, more improvements are planned) feature replaces GitLab's built-in project pipeline list with an enhanced view that offers filtering GitLab's UI does not: - **Search by pipeline name** - partial, case-insensitive, multi-word matching (convenience: also matches branch/ref, SHA, commit message and the user who triggered it). - **Status filtering** - two compact dropdowns (Active / Finished); tick any combination of statuses (e.g. only *Passed*/*Failed*, or exclude *Skipped* pipelines). A single selected status is filtered on the server. - **Rich columns** - stages shown as colored "balls" (mini pipeline graph; hovering a ball loads and shows its jobs, linking to the job pages), the commit message (truncated) with the short SHA, and the user who triggered the pipeline. - **Pipeline actions** - "Run pipeline" and the admin-only "Clear runner caches" are mirrored from the original view (shown only when GitLab's own buttons are present). - **Pagination** - configurable page size (20/50/100 rows) with a windowed page pager. The rows-per-page choice is remembered across pages and browser sessions; the API is queried in batches of the same size for a fast initial load. It works on gitlab.com and self-hosted GitLab instances, using the GraphQL API (`/api/graphql`, cursor-paginated) with an automatic fallback to the REST pipelines endpoint on older instances. Licensed under MIT.