refactor(UI): unify dataset card view onto the shared CardItemComponent

[xuang7]

What changes were proposed in this PR?

[Stacked on #5947]

This PR consolidates the public and private dataset listings to use the shared CardItemComponent.

• Replace texera-dataset-card-item with the shared read-only texera-card-item in the public hub.
• Remove the unused DatasetCardItemComponent and its tests.
• Align the hub list/card toggle with the workflow and private dataset listings.
• Update the like button styling on the shared card.

This keeps dataset cards consistent across all listings and reduces duplicated code.

Demo:

Any related issues, documentation, discussions?

Closes #5948

How was this PR tested?

All existing tests passed, and the changes were manually tested.

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

Generated-by: 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: @Ma77Ball, @Yicong-Huang
  You can notify them by mentioning @Ma77Ball, @Yicong-Huang in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 47.22222% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.10%. Comparing base (44df4f7) to head (732c926).
⚠️ Report is 34 commits behind head on main.

Files with missing lines	Patch %	Lines
...nent/user/user-dataset/user-dataset.component.html	0.00%	15 Missing ⚠️
...nt/user/list-item/card-item/card-item.component.ts	75.00%	1 Missing and 2 partials ⚠️
...ponent/user/user-dataset/user-dataset.component.ts	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5949      +/-   ##
============================================
+ Coverage     53.96%   54.10%   +0.13%     
  Complexity     2782     2782              
============================================
  Files          1100     1104       +4     
  Lines         42588    42768     +180     
  Branches       4583     4600      +17     
============================================
+ Hits          22984    23140     +156     
- Misses        18268    18279      +11     
- Partials       1336     1349      +13     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.44% <ø> (ø)		Carriedforward from 44df4f7
agent-service	34.36% <ø> (ø)		Carriedforward from 44df4f7
amber	55.27% <ø> (ø)		Carriedforward from 44df4f7
computing-unit-managing-service	1.65% <ø> (ø)		Carriedforward from 44df4f7
config-service	57.35% <ø> (ø)		Carriedforward from 44df4f7
file-service	57.06% <ø> (ø)		Carriedforward from 44df4f7
frontend	48.56% <47.22%> (+0.41%)	⬆️
pyamber	90.19% <ø> (ø)		Carriedforward from 44df4f7
python	90.80% <ø> (ø)		Carriedforward from 44df4f7
workflow-compiling-service	58.69% <ø> (ø)		Carriedforward from 44df4f7

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

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