Release 1.0 iPad navigation fix

[Chefski]

Promotes the tested iPad navigation fix from dev to main for the next Xcode Cloud release build.

Verification completed on the source PR:

• iPad build
• iOS and macOS unit tests
• iOS and macOS UI smoke tests
• SwiftLint, CRDT drift, and Git hygiene
• focused iPad navigation and transition tests

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failure identified in the supported navigation paths.

Compact layouts retain NavigationStack-based page opening, regular-width layouts update the split view’s selected page directly, and the associated selection lifecycle behavior is consistent with those two presentation models.

Important Files Changed

Filename	Overview
docmostly/Features/PageReader/PageOpenPresentation.swift	Defines the environment-driven distinction between stack and detail-column page presentation and its cleanup policy.
docmostly/Features/PageReader/PageOpenTarget.swift	Routes reusable page links through stack navigation or direct detail selection and applies presentation-aware cleanup.
docmostly/Features/PageTree/PageTreeNodeView.swift	Uses direct detail-column selection for regular-width page-tree navigation while retaining stack links in compact layouts.
docmostly/Features/Notifications/NotificationListRow.swift	Makes notification page opening presentation-aware while preserving unread-state updates.
docmostly/Features/Spaces/MainShellContentView.swift	Extracts the content root view and clears obsolete stack navigation when switching into detail-column mode.
docmostly/Features/Spaces/MainShellView.swift	Derives page presentation from the iOS horizontal size class and injects it throughout the split-view hierarchy.
docmostlyTests/PageReader/PageOpenPresentationTests.swift	Verifies that stack readers clear selection while detail-column transitions preserve it.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[MainShellView reads horizontal size class] --> B{Compact layout?}
    B -->|Yes| C[PageOpenPresentation.stack]
    B -->|No| D[PageOpenPresentation.detailColumn]
    C --> E[NavigationLink pushes reader]
    E --> F[Reader disappearance clears matching selection]
    D --> G[Button updates AppState selection]
    G --> H[MainShellDetailView displays reader]
    H --> I[Reader disappearance preserves selection]

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_{Reviews (1): Last reviewed commit: "Fix iPad page navigation duplication (#4..." | Re-trigger Greptile}

[cubic-dev-ai]

All reported issues were addressed across 7 files

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