Summary
• **EditChannel.js**
– Displays “Fetch Model List” button for both *create* and *edit* modes (removed `isEdit` guard).
– Unified model selector placeholder to “Please choose supported models”.
– Added null-safety checks when parsing Axios responses.
– Sends requests with `{ skipErrorHandler: true }`, preventing generic *500 Internal Server Error* toasts and relying on context-specific messages instead.
• **helpers/api.js**
– Introduced `skipErrorHandler` flag in the Axios response interceptor.
If present, global `showError` is bypassed, giving callers full control over user-facing notifications.
– Ensures `Promise.reject(error)` is returned for proper error propagation.
Why
Channel creators now enjoy the same convenience as editors when importing upstream model lists.
Meanwhile, suppressing redundant toasts removes confusion caused by simultaneous custom and generic error messages.
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