H integrates the chunk-render pipeline into MessageList:
- Extends ctor to 4 params (themes, resolver, fonts, chunkRenderer);
TokenResolver preserved as load-bearing dep
- Adds private PayloadHandler? _handler field + internal
AttachPayloadHandler(PayloadHandler) setter
- Switches DrawCompactRow/DrawCardRow render-path to
_chunkRenderer.DrawChunks(message.Content, wrap, handler, 0f)
instead of plain TextUnformatted
Setter-injection for PayloadHandler is the §6.2 cycle-resolution
(PayloadHandler → MainWindow → MessageList → PayloadHandler ctor-cycle
broken by post-construction wiring). G's HostedService.StartAsync will
call AttachPayloadHandler after both singletons resolve.
Also extends MessageList DI-reg in PluginHostFactory.cs with the
ChunkRenderer arg (4th GetRequiredService).
JonKazama-Hellion
4fb5ee6128