Glance 0.4.0

Changed

• Select mode supports dragging a selection box, Shift-click multi-selection and
  ⌘A/Ctrl+A to select all, with group dragging, styling, nudging, duplication and
  deletion.
• Linux animated backdrops and image entrance effects now use hardware Vulkan
  compute instead of CPU-only rendering, with cached GPU resources, adapter
  diagnostics, and CPU fallback when acceleration is unavailable.
• Reorganized documentation around release installation and first use, added a
  macOS opening/capture FAQ, and consolidated source-build instructions in BUILD.md.
• README includes a short album-gallery GIF showing rounded padding and an
  animated Lava backdrop.