Fix/product store response handling

[hashhhh-16]

Summary

Improves error handling in deleteProduct and updateProduct by checking res.ok before attempting to parse JSON responses.

Changes

• Added res.ok validation in deleteProduct.
• Added res.ok validation in updateProduct.
• Return a meaningful error message when the server responds with a non-success status.
• Prevent res.json() from throwing when the server returns a non-JSON error response.

Why

Previously, both functions called res.json() immediately after fetch(). If the server returned an HTML error page or another non-JSON response, res.json() would throw a SyntaxError, which was caught and incorrectly reported as a network error. This change preserves the actual request failure information and aligns the behavior with the existing error-handling pattern used elsewhere in the store.

closes #350

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