fix(dashboard): sort datasets by creation time (newest first)

[tanishqgandhi1908]

What changes were proposed in this PR?

The Datasets listing did not show newly created datasets first — they appeared in an effectively undefined order.

Root cause: the datasets listing defaulted to EditTimeDesc, but datasets have no "last modified" timestamp. DatasetSearchQueryBuilder never maps
lastModifiedTime, so it falls back to NULL for every dataset in
UnifiedResourceSchema. The resulting ORDER BY resourceLastModifiedTime DESC NULLS LAST ties on NULL for all rows, so the database returns datasets in an arbitrary order and creation time has no effect. The "Your Work" datasets page
also had no sort control at all, so there was no way to notice or work around it. The Hub's dataset view shared the same latent bug.

This PR:

1. Default the datasets listing to CreateTimeDesc (newest first) on both the "Your Work" datasets page and the Hub dataset view — datasets do have a populated creation_time.
2. Add the shared sort button to the "Your Work" datasets page, which previously had none, laid out consistently with the Workflows page (Create Dataset → [ Sort · List · Card ] → Filters).
3. Make SortButtonComponent reusable by adding showEditTime and showExecutionTime inputs (both default true). Datasets have neither an edit nor an execution time, so those two options are hidden for datasets to prevent them from re-introducing the NULL-ordering behavior. Workflows, Search, and the Hub's workflow view are unchanged.

No backend or schema changes.

Any related issues, documentation, discussions?

Closes #6215

How was this PR tested?

• Updated/added frontend unit tests:
  • SortButtonComponent — new tests covering the showEditTime / showExecutionTime inputs and their defaults.
  • UserDatasetComponent — asserts the default sort is CreateTimeDesc.
  • All affected specs pass (sort-button 8/8, user-dataset 18/18).
• Full production build (ng build) passes with no template/type errors.
• Manually verified on the datasets page and also Confirmed the same on the Hub dataset view, and that Workflows / Search still show all sort options.

Screenshot shows the datasets page in Your Work section

Screenshot shows the datasets page in Hub's section

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

Generated-by: Claude Code (Claude Opus 4.8)

[github-actions]

Automated Reviewer Suggestions

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

• Contributors with relevant context: @xuang7, @roshiiiz
  You can notify them by mentioning @xuang7, @roshiiiz in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 31.57895% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.01%. Comparing base (3e08ebb) to head (1ae5bb7).

Files with missing lines	Patch %	Lines
...nent/user/user-dataset/user-dataset.component.html	0.00%	13 Missing ⚠️

❌ Your patch status has failed because the patch coverage (31.57%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6320      +/-   ##
============================================
- Coverage     61.03%   61.01%   -0.03%     
  Complexity     3378     3378              
============================================
  Files          1140     1140              
  Lines         44923    44932       +9     
  Branches       4942     4944       +2     
============================================
- Hits          27419    27415       -4     
- Misses        15992    16003      +11     
- Partials       1512     1514       +2     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.00% <ø> (ø)		Carriedforward from 3e08ebb
agent-service	44.59% <ø> (ø)		Carriedforward from 3e08ebb
amber	66.44% <ø> (ø)		Carriedforward from 3e08ebb
computing-unit-managing-service	0.00% <ø> (ø)		Carriedforward from 3e08ebb
config-service	52.30% <ø> (ø)		Carriedforward from 3e08ebb
file-service	63.97% <ø> (ø)		Carriedforward from 3e08ebb
frontend	53.28% <31.57%> (-0.04%)	⬇️
notebook-migration-service	78.94% <ø> (ø)		Carriedforward from 3e08ebb
pyamber	91.18% <ø> (ø)		Carriedforward from 3e08ebb
workflow-compiling-service	55.14% <ø> (ø)		Carriedforward from 3e08ebb

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

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[Copilot]

Pull request overview

This PR fixes dataset listings being returned in an effectively undefined order by switching the default dataset sort to creation-time-desc (newest first) and preventing users from selecting sort options that would produce NULL-based ordering for datasets. It also makes the existing sort button reusable across resource types by allowing edit-time and execution-time options to be hidden.

Changes:

• Default dataset views (Your Work + Hub dataset view) to SortMethod.CreateTimeDesc.
• Add the shared sort button to the Your Work datasets page and align the utility controls layout with the workflows page.
• Make SortButtonComponent configurable via showEditTime / showExecutionTime inputs and hide invalid options for datasets.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
frontend/src/app/hub/component/hub-search-result/hub-search-result.component.ts	Defaults Hub dataset view sorting to CreateTimeDesc when browsing datasets.
frontend/src/app/hub/component/hub-search-result/hub-search-result.component.html	Hides edit/execution sort options for dataset search results via SortButtonComponent inputs.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset.component.ts	Defaults Your Work datasets sort to CreateTimeDesc and wires in SortButtonComponent import.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset.component.html	Adds the sort button to the datasets page UI and groups it with view-mode controls.
frontend/src/app/dashboard/component/user/user-dataset/user-dataset.component.spec.ts	Adds/updates unit assertion for default dataset sort being CreateTimeDesc.
frontend/src/app/dashboard/component/user/sort-button/sort-button.component.ts	Adds showEditTime / showExecutionTime inputs to make sort options reusable per resource type.
frontend/src/app/dashboard/component/user/sort-button/sort-button.component.html	Conditionally renders edit/execution sort menu items based on the new inputs.
frontend/src/app/dashboard/component/user/sort-button/sort-button.component.spec.ts	Adds tests for the new inputs (needs stronger DOM-level assertions).

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[aglinxinyuan]

LGTM!

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated no new comments.