frontend: SimpleTable: Fix pagination bug

[skools-here]

Summary

Fixes a bug in SimpleTable where navigating to an empty page occurs when the total number of items is an exact multiple of the page size (e.g. exactly 10 items, viewing the second page).

Related Issue

Fixes #6476

Changes

• Updated page validation check in SimpleTable.tsx from > to >= to capture exact boundary alignments.
• Corrected the fallback page index calculation in SimpleTable.tsx to compute the maximum valid page index using Math.max(0, Math.floor((displayData.length - 1) / rowsPerPage)) .
• Updated the filtered data reset check in SimpleTable.tsx from < to <= to return the page index to 0 when filters matching exactly page * rowsPerPage items are applied.
• Added a new regression unit test in SimpleTable.test.tsx to verify correct page correction at page boundaries.

[kubernetes-prow]

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[Copilot]

Pull request overview

This PR fixes an off-by-one pagination boundary in SimpleTable that could leave users on an empty page when the total row count is an exact multiple of rowsPerPage (e.g., 10 items with rowsPerPage=10 while on page index 1).

Changes:

• Tightened the invalid-page guard to treat page * rowsPerPage === displayData.length as out of range, and corrected the fallback page calculation to the max valid index.
• Adjusted the filtered-data page reset condition to also handle exact boundary matches.
• Added a regression unit test covering the exact-multiple boundary case.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
frontend/src/components/common/SimpleTable.tsx	Fixes page validity checks and fallback page computation at exact pagination boundaries.
frontend/src/components/common/SimpleTable.test.tsx	Adds regression coverage for boundary behavior when the requested page would otherwise render empty.