feat: major wallpaper system overhaul with cross-platform monitor detection, async thumbnail generation

[Kasper24]

• fix: Add background color to wallpaper grid items

  • Adds a bg-secondary class to the and

• refactor: remove wayland-info dependency in favor of Electron API

  • Replaced Wayland-specific monitor parsing via wayland-info with
    Electron's screen.getAllDisplays() to support cross-platform monitor
    detection. This removes the need for the wayland-utils dependency and
    makes monitor detection compatible with both Wayland and X11 systems.

• refactor(query): standardize query keys and support cache invalidation from settings

  • Replaced inconsistent query keys like explore-pexels-images with
    namespaced keys such as wallpapers.explore.pexelsImages for
    consistency.
  • Extended useSettings hook and related components to support
    additionalQueryKeysToInvalidate, enabling related data (e.g.,
    API-driven wallpapers) to be revalidated when settings change.
  • Updated settings config for API keys and folder sources to invalidate
    relevant queries on change, ensuring the UI stays in sync with updated
    settings.

• refactor: add Sharp and FFmpeg support for thumbnail generation and improve wallpaper handling

  • Add sharp dependency and include ffmpeg in Arch and Nix packaging
  • Implement thumbnail caching and generation for images and videos using
    Sharp and FFmpeg
  • Update wallpaper data models to separate thumbnailPath and
    fullSizePath
  • Modify API wallpaper transformations to align with new data structure
  • Adjust image/video wallpaper rendering to use cached thumbnails
  • Refactor wallpaper grid and dialog components for improved thumbnail
    usage and UI consistency
  • Add execute helper option to ignore errors for smoother FFmpeg
    thumbnail extraction
  • Update Forge config and Vite external to include sharp

• fix: wallpaper engine API key retrieval

  • Add decrypt: true option when fetching API key from settings

• refactor(settings/wallpaper): store last wallpaper as full schema per monitor

  • Replace internal.lastWallpaperCmd with internal.lastWallpaper as a
    Record<string, SetWallpaperSchema> to persist complete wallpaper
    state
    per monitor instead of only storing the executed command.
  • Added screenshot flag to SetWallpaperSchema to control whether
    preview images are generated and copied.
  • Updated set procedure to save wallpapers for all monitors on apply.
  • Modified restore logic to reapply stored wallpapers directly via
    wallpaper.set rather than executing saved commands.
  • Removed old command/args persistence in wallpaper setters.

• fix(wallpaper): default to all monitors when none specified

  • Updated set procedure to automatically populate input.monitors
    with all detected monitors if no monitors are provided in the request.
  • Ensures wallpapers are always applied to at least one monitor.

• refactor(wallpaper): split monolithic module into focused components

  • Extract type definitions to dedicated types.ts file
  • Move search functionality to search.ts module
  • Separate wallpaper setting logic into set.ts
  • Create thumbnail handling module (thumbnail.ts)
  • Update all import paths to reference new modular structure
  • Maintain existing API surface while improving code organization

  This improves maintainability by separating concerns and making the
  codebase easier to navigate and modify.

• refactor: offload thumbnail generation to worker thread

  • Move thumbnail generation from main thread to dedicated worker
  • Convert thumbnail.ts to worker thread with parentPort messaging
  • Update wallpaper search to use worker for non-blocking thumbnail
    processing
  • Add thumbnail-generator entry to vite build configuration
  • Improve UI responsiveness by preventing main thread blocking during
    thumbnail creation

  This ensures the main application remains responsive while processing
  large numbers of wallpaper thumbnails in the background.

• fix: restoring wallpaper blocking ui