fix(display): sync Treeland wallpaper previews

[caixr23]

Summary

• Sync Treeland desktop wallpaper changes between the personalization and display plugins.
• Resolve video wallpaper thumbnails by monitor name for immediate preview updates.
• Rebind Treeland wallpaper contexts when the display page becomes active.

Multica issue

DDE-88

Test recommendations

• Verify Treeland display previews update immediately after changing image wallpapers on primary and secondary screens.
• Verify video wallpaper previews update immediately and show the expected thumbnail.
• Verify X11 wallpaper preview behavior remains unchanged.

Summary by Sourcery

Synchronize Treeland wallpaper state across personalization and display pages to keep monitor previews current.

New Features:

• Synchronize Treeland desktop wallpaper updates between the personalization and display plugins, including monitor-specific video thumbnail previews.

Bug Fixes:

• Ensure Treeland display wallpaper previews refresh immediately when desktop wallpapers change and reconnect wallpaper contexts when the display page is reactivated.

Enhancements:

• Add shared wallpaper synchronization state and notifications for cross-plugin wallpaper updates.

Build:

• Link the display and personalization plugins with the shared utilities library.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: caixr23

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[sourcery-ai]

Reviewer's Guide

Adds a shared wallpaper synchronization channel between Treeland personalization and display plugins, allowing immediate per-monitor image and video preview updates, and refreshes wallpaper contexts when the display page is reactivated while preserving existing X11 behavior.

Sequence diagram for Treeland wallpaper preview synchronization

sequenceDiagram
    participant Personalization as TreelandPersonalization
    participant Sync as WallpaperSync
    participant Display as DisplayWorker
    participant Monitor as TreelandMonitor

    Personalization->>Sync: setWallpaper(monitorName, dest, type)
    Sync-->>Display: wallpaperChanged(monitorName, source, sourceType)
    alt VideoSourceType
        Display->>Display: resolveVideoThumbnail(source, monitor)
    end
    Display->>Monitor: setWallpaper(wallpaper)

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Flow diagram for rebinding Treeland wallpaper contexts

flowchart LR
    A[Display page becomes active] --> B{Treeland mode}
    B -->|Yes| C["rebindWallpaperContexts()"]
    C --> D["removeWallpaper(output)"]
    D --> E["ensureWallpaperContext(screen)"]
    E --> F[Refresh per-monitor wallpaper previews]
    B -->|No| G[Preserve existing X11 behavior]

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File-Level Changes

Change	Details	Files
Introduces a shared, application-thread-safe wallpaper synchronization service to propagate Treeland desktop wallpaper updates between plugins.	Adds a QObject singleton storing per-monitor wallpaper source and type. Emits deduplicated wallpaper change notifications. Uses queued invocation to update the shared state from the personalization worker. Links both plugins against the shared utility library.	src/shared-utils/wallpapersync.h src/shared-utils/wallpapersync.cpp src/shared-utils/CMakeLists.txt src/plugin-display/CMakeLists.txt src/plugin-personalization/CMakeLists.txt src/plugin-personalization/operation/treelandworker.cpp
Updates the Treeland display worker to consume synchronized wallpaper changes and refresh previews by monitor.	Connects to wallpaper synchronization notifications during Treeland initialization. Resolves video wallpaper sources to monitor-specific thumbnails before applying them. Matches synchronized changes to Wayland monitors by name and updates their wallpaper preview.	src/plugin-display/operation/private/displayworker.cpp src/plugin-display/operation/private/displayworker.h
Rebinds Treeland wallpaper contexts when the display page becomes active.	Removes existing wallpaper contexts for tracked screens. Recreates contexts so previews reflect the latest wallpaper state after page activation.	src/plugin-display/operation/private/displayworker.cpp src/plugin-display/operation/private/displayworker.h

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