Fix iPad page navigation duplication

[Chefski]

Summary

• route page selections to the detail column on regular-width iPad layouts
• keep compact iPhone navigation using the existing push stack
• apply the same behavior to page tree, recent/favorite links, and notifications

Verification

• swiftlint lint --strict (691 files, 0 violations)
• xcodebuild -project docmostly.xcodeproj -scheme docmostly -destination "generic/platform=iOS Simulator" build CODE_SIGNING_ALLOWED=NO
• runtime verified on iPad and iPhone simulators before commit
• git diff --check

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
docmostly/Features/Spaces/MainShellView.swift	Injects size-class-dependent page presentation across the iOS split-view hierarchy.
docmostly/Features/Spaces/MainShellContentView.swift	Preserves the content NavigationStack while extracting its root destination switch into a dedicated view.
docmostly/Features/PageReader/PageOpenTarget.swift	Routes page links either through stack navigation or AppState-driven detail-column selection.
docmostly/Features/PageTree/PageTreeNodeView.swift	Applies the same presentation-aware routing to page-tree nodes.
docmostly/Features/Notifications/NotificationListRow.swift	Makes notification page opening presentation-aware while retaining unread-state handling.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User selects a page] --> B{Horizontal size class}
    B -->|Compact| C[Use NavigationLink]
    C --> D[Push page onto content stack]
    B -->|Regular| E[Use Button action]
    E --> F[Update AppState selected page]
    F --> G[Render page in detail column]
    H[Settings and non-page destinations] --> I[Content NavigationStack]
    I --> J[Push registered destination]

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_{Reviews (2): Last reviewed commit: "fix: preserve content column navigation" | Re-trigger Greptile}

[cubic-dev-ai]

No issues found across 6 files

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[cubic-dev-ai]

All reported issues were addressed across 1 file (changes from recent commits).

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