Add Catalyst document picker host (PR 20/20)

[agoodkind]

Summary

This change gives Mac Catalyst a stable UIKit document picker host. Import no longer shares SwiftUI sheet ownership with other config-library presentations.

Change

The host owns request identity, one active picker, delegate completion, and dismissal completion. Import stays disabled until the picker and import lifecycle return to idle.

The iPhone surface remains read-only and unchanged.

Testing

• make lint
• make test
• make build-catalyst-ci CONFIG=Debug
• Tart Mac Catalyst UI matrix: 5 passed, 0 failed
• Tart iPhone UI matrix: 2 passed, 0 failed
• The Catalyst matrix covered cancel, repeated cancel, valid real-file import, invalid real-file recovery, scrolling, and continued button interaction

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• Commit unit tests in branch stabilize-catalyst-document-picker

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[agoodkind]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add Catalyst document picker host (PR 20/20) #70 👈 (View in Graphite)
• Allow Catalyst read-only user-selected files (PR 19/20) #64
• Cover iPhone and Catalyst config library UI (PR 18/20) #63
• Add UI test target and command routing (PR 17/20) #62
• Add deterministic cross-platform UI fixtures (PR 16/20) #61
• Finalize config library capability boundary (PR 15/20) #60
• Remove shared provisioning compatibility (PR 14/20) #59
• Add config library accessibility identifiers (PR 13/20) #58
• Surface config import failures and isolate presentation source (PR 12/20) #57
• Propagate config import failures through the Catalyst backend (PR 11/20) #56
• Own Catalyst config library presentation state (PR 10/20) #55
• Compile Catalyst setup state and config reader only on Mac (PR 9/20) #54
• Add Catalyst config library backend (PR 8/20) #53
• Compile Catalyst config editor views only on Mac (PR 7/20) #52
• Compile Catalyst config library container only on Mac (PR 6/20) #51
• Compile Catalyst setup screen and relay model only on Mac (PR 5/20) #50
• Separate iPhone tunnel provisioning capability (PR 4/20) #49
• Extract relay controller config actions (PR 3/20) #48
• Restrict config management to Catalyst and serialize its presentation flows (PR 2/20) #38
• Build and verify every platform in one CI Verify job (PR 1/20) #69
• main

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