Frontend: Update Visual Language of the Visualization Tab
## Goal Update the visual styling of the Pipeline Editor's Visualization tab to align with the latest Figma designs, without changing interaction behavior. ## Scope This iteration focuses **only** on visual language updates: - Updated node styling (colors, borders, typography) - Updated connection lines and arrows - Alignment with design system specifications **Out of scope for this iteration:** - Drag & drop functionality - Artifact management - Other features from the original Visual Canvas proposal ## Acceptance Criteria - [ ] Visual language matches the latest Figma designs - [ ] Existing interaction behavior remains unchanged - [ ] Known limitations (e.g., maximum displayable nodes) are documented for users and stakeholders ## Design Reference - [Figma](https://www.figma.com/design/pbWiw8cizNEZMOz1ObAVd5/Ideation--AI-first-pipeline-editing-experience?node-id=1607-99138&m=dev) ## Technical implementation - Update the current graph in: https://gitlab.com/gitlab-org/gitlab/-/tree/master/app/assets/javascripts/ci/pipeline_editor/components/graph - Use a feature flag to ensure that the previous visualization remains available until full rollout
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