Updates the MCP Apps specification to consistently use the
`ui/notifications/` prefix for all notification methods (e.g.,
`ui/notifications/sandbox-ready`, `ui/notifications/tool-result`). Also
removes trailing whitespace, fixes tab/space inconsistencies, improves
code formatting with proper backticks, and clarifies terminology
throughout the document.
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Co-Authored-By: Claude <noreply@anthropic.com>
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