SwiftUI only supports one fileExporter modifier per view hierarchy.
When multiple fileExporter modifiers are attached, only the last one
takes effect. Unified ProfileExportDocument and ProfileJSONExportDocument
into a single ProfileAnyExportDocument to use one fileExporter for both
file types.
Add "Save File" and "Save Content JSON" options to profile share menu,
allowing users to save profiles directly to a chosen location using
fileExporter instead of the system share sheet.
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