Lua Editor Part 2

[Pursche]

Moves Hierarchy, Inspector and AssetBrowser to Luau editors with the CanvasRenderer, gets rid of their C++/ImGui counterparts. Also cleans up old C++/ImGui based MapSelector.

[Copilot]

Pull request overview

This PR updates the Vulkan renderer’s per-frame synchronization around descriptor updates and staging uploads by introducing deferred buffer-descriptor writes (applied after the relevant frame-slot fence wait) and adding an explicit “unlock uploads” hook to re-enable staging uploads for the next frame phase.

Changes:

• Defer buffer descriptor writes via DescriptorHandlerVK::FlushPendingBufferWrites() and invoke it from RendererVK::FlipFrame() after waiting the frame fence.
• Add Renderer::UnlockUploads() / UploadBufferHandlerVK::UnlockUploads() and introduce an upload lock + assert to prevent render-thread staging uploads after the per-frame submit point.
• Adjust BindDescriptor APIs to bind buffer descriptors by BufferID (resolving the VkBuffer later at flush time).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Source/Renderer/Renderer/Renderers/Vulkan/RendererVK.h	Adds UnlockUploads() override to the Vulkan renderer interface.
Source/Renderer/Renderer/Renderers/Vulkan/RendererVK.cpp	Updates buffer descriptor binding semantics and flushes deferred buffer writes during FlipFrame; forwards UnlockUploads().
Source/Renderer/Renderer/Renderers/Vulkan/Backend/UploadBufferHandlerVK.h	Adds UnlockUploads() API for the upload handler.
Source/Renderer/Renderer/Renderers/Vulkan/Backend/UploadBufferHandlerVK.cpp	Introduces a per-frame upload lock + render-thread assert; implements UnlockUploads().
Source/Renderer/Renderer/Renderers/Vulkan/Backend/DescriptorHandlerVK.h	Changes buffer BindDescriptor signature and adds FlushPendingBufferWrites() + internal helper.
Source/Renderer/Renderer/Renderers/Vulkan/Backend/DescriptorHandlerVK.cpp	Implements pending per-slot buffer writes and per-frame-slot flush of vkUpdateDescriptorSets.
Source/Renderer/Renderer/Renderer.h	Extends the renderer interface with UnlockUploads() and documents intended usage.

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