FOUR-32743: Handle invalid Process Browser category IDs

[eiresendez]

Issue & Reproduction Steps

Opening the Process Browser with an arbitrary non-existent category ID, such as `/process-browser/?categoryId=lorem`, causes the processes API to pass a string to the integer-typed category scope and return a 500 error.

Solution

• Validate non-empty category filters before applying the category scope.
• Return an empty process collection for invalid category values.
• Preserve the existing behavior for recent, empty, and valid numeric category values.
• Add regression coverage for invalid, missing numeric, and valid category IDs.

How to Test

• Run `./vendor/bin/phpunit tests/Feature/Api/ProcessLaunchpadTest.php`.
• Open `/process-browser/?categoryId=lorem`.
• Confirm the processes request returns 200, the empty state is displayed, and no Axios error is logged.

Automated result: 9 tests passed with 25 assertions.

Related Tickets & Packages

• https://processmaker.atlassian.net/browse/FOUR-32743

ci:deploy

[decisions-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[nolanpro]

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