docs: markdown, code-highlighting and inline-image feature tour

Website and docs now showcase rich content rendered directly in the
console: MarkdownView (headings, lists, quotes, tables, inline styles),
CodeDocument syntax highlighting (27 grammars) and inline images
(Sixel/Kitty/iTerm2 with truecolor half-block fallback), each with a
renderer-generated screenshot (markdown.svg, code.svg, images.svg).

Also: supported-controls catalogue on the site and docs index, inline
image setup guide + protocol table in the console guide, Windows
Terminal 1.22+ Sixel support noted in the package table, and the
install feature table now scrolls instead of overflowing the page on
narrow viewports.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: tedd

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **`TuiXamlView` Blazor component**: hosts a XAML-defined TUI (`Source` file/URL or inline `Xaml`, plus `Controller`), standalone or nested in a `TuiView`; `XamlSource` resolves files, app-base paths and HTTP.
 - **XamlLoader designer compatibility**: XML namespaces, prefixed elements, `x:Name` and designer attributes (`mc:Ignorable`, `d:DesignWidth`, `x:Class`, …) are now tolerated/ignored, so one file works in XAML editors and every host.
 - **Documentation**: `docs/` with getting-started (all hosts × XAML/programmatic), XAML guide, per-platform guides, and a GitHub Pages website (`docs/index.html`) with renderer-generated screenshots.
+- **Documentation — rich-content feature tour**: website and docs now showcase markdown rendering (`MarkdownView`), syntax highlighting (`CodeDocument`, 27 grammars) and inline images (Sixel/Kitty/iTerm2 + truecolor half-block fallback) with new renderer-generated screenshots (`docs/assets/markdown.svg`, `code.svg`, `images.svg`); added a supported-controls catalogue, an inline-image setup section to the console guide, and noted Windows Terminal 1.22+ Sixel support in the package table.
 - **Packaging/CI**: shared NuGet metadata + package icon for all 11 packages; deploy workflow packs and publishes every package on `deploy`/`deploy/prod` with rising versions (`VERSION` file + run number); CI moved to Windows with MAUI workload; GitHub Pages deploy workflow.
 - Initial release of **Tedd.TUI**.
 - Core framework architecture (`UIElement`, `DependencyProperty`, `Geometry`).

docs/README.md

@@ -13,6 +13,45 @@ terminal, a browser, and a desktop window.
   Blazor, Blazor Canvas, WPF, Avalonia, WinUI, MAUI), in both XAML and code.
 - **[XAML guide](xaml.md)** — the markup dialect, controller binding, designer compatibility.
 
+## Rich content in the console
+
+The core package renders rich content straight into the character grid — in a plain
+terminal just as on every GUI host:
+
+- **Markdown** — `MarkdownView` live-parses markdown into styled cells: headings, bold
+  text, bullet lists, quotes, tables, inline code and hyperlinks, all themable via
+  `MarkdownTheme`. Fenced code blocks are syntax-highlighted automatically and image
+  references render inline.
+
+  ![MarkdownView rendering markdown in the terminal](assets/markdown.svg)
+
+- **Code highlighting** — `CodeDocument` tokenizes source with a PrismJS-style grammar
+  engine and renders colored cells, standalone or inside markdown fences. 27 grammars
+  ship in the box: ASM 6502, ASP.NET, Bash, BASIC, Batch, C#, CIL, C-like, cshtml/Razor,
+  CSS, CSV, Diff, JSON, JSON5, Lua, Markdown, NASM, Perl, PowerShell, Python, Regex,
+  Rust, SQL, URI, WASM, XML/HTML and YAML.
+
+  ![CodeDocument syntax highlighting C# and JSON](assets/code.svg)
+
+- **Images** — the `Image` control puts real bitmaps into the cell grid: pixel-perfect
+  Sixel (Windows Terminal 1.22+, VT340-style terminals), Kitty graphics and iTerm2
+  (iTerm2/WezTerm/Ghostty) output in terminals, direct bitmap compositing on GUI and
+  browser hosts, and a truecolor half-block fallback everywhere else. Decoding (PNG,
+  JPEG, GIF, WebP, …) comes from `Tedd.TUI.Imaging`; see the
+  [console guide](platforms/console.md#inline-images).
+
+  ![Inline bitmap and half-block fallback rendering of the same photo](assets/images.svg)
+
+## Controls
+
+Border, Button, Canvas, CheckBox, CodeDocument, ComboBox, ContentControl, DataGrid,
+DialogBox, DockPanel, Expander, Grid, GridSplitter, GroupBox, Image, ItemsControl,
+ListBox, MarkdownView, MenuBar, MenuItem, PasswordBox, ProgressBar, RadioButton,
+ScrollBar, ScrollViewer, Separator, Slider, StackPanel, TabControl, TabItem, Table,
+TextBlock, TextBox, TextEditor, ToggleButton, TreeView, TreeViewItem, TuiWindow,
+UniformGrid, WrapPanel — plus WPF-style data binding, routed events, control templates
+and triggers.
+
 ## Platform hosts
 
 | Host | Package | Guide |