Bound customCSS to 100000 characters on both the client schema and the
server body validation (the server is the enforcement boundary; multer's
1MB field cap was the only limit), regenerate the OpenAPI spec, and add
a validation test suite covering acceptance, clearing, the length cap,
and type rejection.
Addresses reviewer feedback by enforcing strict validation on the array. Previously, the Zod schema accepted any arbitrary number, which could allow invalid or self-defined HTTP codes (e.g., 5000) to be saved to the database.
Refs #3657
Buco7854
Alex Holliday
harsh-aghara