Add VlcPlayer engine and update docs/enums
Introduce the new VlcPlayer live engine: add Engine-VlcPlayer.md and wire VlcPlayer into documentation, enums, settings, caches, logs, publish pipeline, preprocessor symbols, properties, and runtime-dependency pages. Update references/counts from seven→eight engines, include VlcPlayer in EngineType/PropertiesType lists, allowed-engine matrices (Gif/Video), cache and AppData paths, customization/property-panel docs, and publish scripts/docs to include the new project. Documentation clarifies libVLC is bundled (no runtime prompt) and notes hardware-acceleration behavior and GIF handling. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Update docs: Portal toolbar is top toolbar
Replace references to the Portal footer toolbar with the top toolbar across documentation. Adjust related wording (search box, settings gear, theme toggle, Display Preferences, Wallpaper Cycling, Create dialog, screenshots) to reflect the toolbar being on the top navigation bar. Updated pages: Choosing-Engines, Create-Step-By-Step, Getting-Help, Managing-Library, Multi-Monitor, Portal-Interface-Tour, Quick-Start, README, Settings-General, Settings-Overview, Settings-Performance, Settings-Personal, Theme-Tray-Startup, Using-Store, Wallpaper-Cycling. These changes keep the docs consistent with the Portal UI relocation.
Add Mermaid diagrams and update README
Embed native Mermaid diagrams into multiple wiki pages to replace diagram placeholders (Architecture, engines, create, publish pipeline, installer, settings persistence, repo layout, types, etc.). Update README publishing instructions (fix source path, simplify steps) and mark diagrams as done; refresh screenshot checklist to list remaining screenshot placeholders and clarify inline preview behavior. Mostly documentation-only changes improving diagram availability and publishing guidance.