improvement: error handling for `zod` validation failures in tools store

[DarianM]

Problem

File toolStore.tsx valtio store

• saveConfig the action method stores invalid responses: when the API returns validation errors, the method still updates toolState.configurations with the response data, even if it contains error information instead of valid configurations due to zod failing validations
• No structured error handling: Zod validation errors from the server are not properly parsed or surfaced to the user
• Silent failures: users don't receive clear feedback about what validation rules failed
• State corruption: invalid data may be stored in the application state

Expected Behavior

• Parse API response structure: differentiate between success responses (valid configs) and error responses (validation failures)
• Extract Zod error details: parse server-side validation errors into a user-friendly format
• Preserve application state: don't update configurations when validation fails
• Surface validation feedback: show specific field errors to help users fix their input, to allow users to retry after fixing validation issues (only if/where this could be possible)