feat(dataset): add dataset contributor display and editing

[xuang7]

What changes were proposed in this PR?

This PR adds the frontend for dataset contributor metadata so that dataset authors and other contributors can be properly acknowledged, on top of the backend added in #6952.

Changes:

• Dataset detail page: a new "Metadata" card in the Data Card tab with a collapsible "Contributors" section. Each contributor is shown as a card with name, email, affiliation, and comments; the dataset creator is marked with a star. Long field values are truncated to two lines with the full content shown in tooltips.
• Users with WRITE access can add, edit, and delete contributors through a dropdown menu on each card, with optimistic updates and rollback if saving fails.
• A new user-dataset-contributor-editor modal component for adding and editing a contributor, backed by a shared Formly field group (contributor-form-fields.ts) with client-side validation (required name, email format, length limits).
• Dataset creation: the create-dataset form accepts an optional initial list of contributors, sent with the create request.
• DatasetService: createDataset gains a contributors argument, and a new updateDatasetContributors method posts the full list to POST /dataset/update/contributors.
• Types: Contributor interface, DashboardDataset.contributors, and an optional isPlaceholder flag on User with a "placeholder" tag in the admin user list. The tag stays hidden until the follow-up backend that auto-creates placeholder accounts for contributor emails lands; it is included here so the admin UI is ready for it.

Demo

Create a dataset with contributor metadata	Add a contributor from the dataset detail page

Contributor list:

Any related issues, documentation, discussions?

Depends on #6952
Closes #6926

How was this PR tested?

New vitest cases across four spec files: contributor card rendering and add/edit/delete flows with rollback on failure (dataset-detail), editor form validation and modal results (contributor-editor), request shapes for create/update (dataset.service), and the extended create-dataset form fields (version-creator). The flow was also manually tested in the UI.

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Claude Code (Claude Fable 5)

[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @rbelavadi, @aglinxinyuan, @jaeyun0503
  You can notify them by mentioning @rbelavadi, @aglinxinyuan, @jaeyun0503 in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.36364% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.86%. Comparing base (e7cd5b1) to head (1eb1f4e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ser-dataset-explorer/dataset-detail.component.html	92.59%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6953      +/-   ##
============================================
+ Coverage     82.73%   82.86%   +0.12%     
  Complexity     4089     4089              
============================================
  Files          1162     1165       +3     
  Lines         46302    46412     +110     
  Branches       5162     5173      +11     
============================================
+ Hits          38308    38458     +150     
+ Misses         6302     6257      -45     
- Partials       1692     1697       +5     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from e7cd5b1
agent-service	83.65% <ø> (ø)		Carriedforward from e7cd5b1
amber	79.53% <ø> (ø)		Carriedforward from e7cd5b1
computing-unit-managing-service	43.60% <ø> (ø)		Carriedforward from e7cd5b1
config-service	65.97% <ø> (ø)		Carriedforward from e7cd5b1
file-service	67.74% <ø> (ø)		Carriedforward from e7cd5b1
frontend	83.84% <96.36%> (+0.28%)	⬆️
notebook-migration-service	78.89% <ø> (ø)		Carriedforward from e7cd5b1
pyamber	97.36% <ø> (ø)		Carriedforward from e7cd5b1
workflow-compiling-service	26.31% <ø> (ø)		Carriedforward from e7cd5b1

*This pull request uses carry forward flags. Click here to find out more.

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[Copilot]

Pull request overview

This PR adds Angular frontend support for dataset contributor metadata (introduced in the backend/API in #6952), enabling contributors to be displayed on the dataset detail page and edited via a modal, and allowing contributors to be provided during dataset creation.

Changes:

• Adds contributor typing and wires contributors through dataset create + dataset detail retrieval flows.
• Introduces a contributor editor modal (Formly-based) and integrates contributor add/edit/delete into the dataset detail UI with optimistic updates.
• Adds/updates frontend unit tests covering service calls and contributor edit flows.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
frontend/src/app/dashboard/type/dashboard-dataset.interface.ts	Extends dashboard dataset typing to include contributors.
frontend/src/app/dashboard/service/user/dataset/dataset.service.ts	Sends contributors on dataset creation; adds contributors update API call.
frontend/src/app/dashboard/service/user/dataset/dataset.service.spec.ts	Adds tests for contributors in create request + update contributors endpoint.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-version-creator/user-dataset-version-creator.component.ts	Adds optional contributors form array to dataset creation flow.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-version-creator/user-dataset-version-creator.component.spec.ts	Updates Formly stubs/expectations to include contributors field.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-contributor-editor/user-dataset-contributor-editor.component.ts	New modal component + reusable Formly contributor field group (incl. email validation).
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-contributor-editor/user-dataset-contributor-editor.component.spec.ts	Unit tests for contributor editor modal behavior and validation.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-contributor-editor/user-dataset-contributor-editor.component.scss	Styles for contributor editor modal layout and buttons.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/user-dataset-contributor-editor/user-dataset-contributor-editor.component.html	Template for contributor editor modal form + actions.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/dataset-detail.component.ts	Stores contributors from dataset response; adds optimistic add/edit/delete + persistence.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/dataset-detail.component.spec.ts	Adds tests for contributor mapping and optimistic update/rollback behavior.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/dataset-detail.component.scss	Adds contributor section/card styling with truncation and tooltips.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset-explorer/dataset-detail.component.html	Adds Contributors UI section, action dropdown, and add-card control.
frontend/src/app/common/type/dataset.ts	Adds Contributor type and contributors on Dataset.

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[aicam]

LGTM