Inline vs toast errors: when to use which in forms and API failures

[1nonlypiece]

Description

Avoid duplicate or dismissible errors fighting for attention.

Scope

• ErrorButton, form field errors, global banner pattern if any.
• Auto-dismiss rules for toasts.

Acceptance criteria

• Decision tree for form field error vs page-level vs toast.
• Accessibility: aria-live regions policy.

[barry01-hash]

@barry01-hash has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I would like to provide u with instant solution

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