fix: fixed missing rowsBefore in summeray2

[JamalAlabdullah]

Description

• Fix missing rowsBefore rendering in RepeatingGroup Summary2 table view
• Add test for it.

Before:

After:

Related Issue(s)

• closes RepeatingGroup rowsBefore is missing from Summary2 #4188

Verification/QA

• Manual functionality testing
  • I have tested these changes manually
  • Creator of the original issue (or service owner) has been contacted for manual testing (or will be contacted when released in alpha)
  • No testing done/necessary
• Automated tests
  • Unit test(s) have been added/updated
  • Cypress E2E test(s) have been added/updated
  • No automatic tests are needed here (no functional changes/additions)
  • I want someone to help me make some tests
• UU/WCAG (follow these guidelines until we have our own)
  • I have tested with a screen reader/keyboard navigation/automated wcag validator
  • No testing done/necessary (no DOM/visual changes)
  • I want someone to help me perform accessibility testing
• User documentation @ altinn-studio-docs
  • Has been added/updated
  • No functionality has been changed/added, so no documentation is needed
  • I will do that later/have created an issue
• Support in Altinn Studio
  • Issue(s) created for support in Studio
  • This change/feature does not require any changes to Altinn Studio
• Sprint board
  • The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board
  • I don't have permissions to do that, please help me out
• Labels
  • I have added a kind/* and backport* label to this PR for proper release notes grouping
  • I don't have permissions to add labels, please help me out

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR extends RepeatingGroupTableSummary to render rows that appear before the main visible rows, complementing the existing after-rows functionality. The implementation introduces a shared renderExtraRows helper to centralize rendering of both before and after row groups, with test coverage verifying the new capability.

Changes

RepeatingGroup table summary before/after rows

Layer / File(s)	Summary
Test fixture and layout configuration src/layout/RepeatingGroup/Summary2/RepeatingGroupTableSummary/RepeatingGroupTableSummary.test.tsx	Test LayoutOptions type adds withRowsBefore flag, and createLayout conditionally injects rowsBefore block into the layout when enabled.
Core implementation with renderExtraRows helper src/layout/RepeatingGroup/Summary2/RepeatingGroupTableSummary/RepeatingGroupTableSummary.tsx	Component imports GridRows type, updates useItemWhenType to retrieve rowsBefore, refactors table body to call shared renderExtraRows helper for both before and after rows, and centralizes row and cell rendering in the new helper function.
Test assertion for before-rows rendering src/layout/RepeatingGroup/Summary2/RepeatingGroupTableSummary/RepeatingGroupTableSummary.test.tsx	New test case asserts that summary.before is rendered in the summary table when withRowsBefore is enabled.

---

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title mentions fixing missing rowsBefore in summary2, which aligns with the actual changes that add rowsBefore support to RepeatingGroupTableSummary.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description follows the required template with all major sections present: description with visual context, related issue reference, and comprehensive verification/QA checklist.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 4188-repeatinggroup-rowsbefore-is-missing-from-summary2

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Magnusrm]

It seems like the rowsbefore should come before the header in the summary like it does for the regular component.

Also it seems like the rows are missing a cell in order to take up as mnuch space as the regular rows which contain an edit button. There is logic for this in the Grid components summary2, where the row gets an edit button if the row contains a form component (editable component), and an empty cell if it contains no form components.

In GridSummary.tsx: