Fix (#79) latest report export button behavior on Reports page

[Jeshika311]

Description

Updated the Reports page export button behavior by replacing the placeholder latest-report export action with a proper latest ready report export flow.

Changes made:

• Updated the export button logic in frontend/src/pages/Reports.tsx
• Ensured the button opens the latest ready report PDF URL
• Disabled/handled the button properly when no ready report exists
• Preserved existing per-report export functionality
• Added/updated tests for export button behavior

Related Issues

Closes #79

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Verified that the export button opens the latest ready report PDF
• Verified that the button remains disabled/hidden when no ready report exists
• Confirmed that existing per-report export buttons continue working correctly
• Ran frontend tests to ensure no regressions

Checklist

• My code follows the code style of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.

[Copilot]

Pull request overview

Updates the Reports page “Export Latest Report” header button to export the newest ready report PDF (instead of a placeholder route), and adds unit tests covering the updated behavior. This PR also introduces an unrelated Scanner catalog retry UX (with a new unit test) and a backend integration test for missing-plugin task starts.

Changes:

• Reports header export button now finds the newest ready report and opens its /task/:id/report/pdf URL; disables the button when no ready report exists.
• Added unit tests validating header export behavior (newest-ready vs. disabled state).
• Added Scanner catalog “Retry” flow plus a unit test; added a backend integration test for missing plugin start-task behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
frontend/src/pages/Reports.tsx	Implements “Export Latest Report” behavior using newest ready report and disables when unavailable.
frontend/testing/unit/pages/Reports.test.tsx	Adds unit tests for the header export button behavior.
frontend/src/pages/Toolkit.tsx	Adds retry mechanism for plugin catalog loading failures.
frontend/testing/unit/pages/ScannerRetry.test.tsx	Tests the new Toolkit catalog retry flow.
testing/backend/integration/test_routes.py	Adds integration coverage for starting a task with a missing plugin id.

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[utksh1]

The “export latest report” change is useful, but this PR currently includes unrelated and blocking changes:

• Removes final newline in testing/backend/integration/test_routes.py (should keep newline)
• Modifies backend concurrency limiter tests (unrelated to Reports UI)
• Adds a binary testout.txt file (should not be in the repo)

Please remove the unrelated backend/testout changes and keep this PR focused on the Reports page + frontend tests (or split into separate PRs). After that, I can re-review and we can rebase onto the updated Reports filters work.

[Jeshika311]

@utksh1 I’ve removed the unrelated backend/testout changes and cleaned up the PR.
Now the PR only contains the relevant Reports page changes and related frontend updates.
I also tested the changes locally on my system, and everything is working correctly now.
Could you please re-review it when you get a chance? Thanks