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892b33bac5
The on-screen window capture is composited from the desktop framebuffer, so it already includes the GL 3D viewport as currently shown (model in the editor, toolpaths in Preview). The offscreen render_thumbnail path only ever drew the model GLVolumeCollection — never the gcode toolpaths — and produced a blank image after slicing because the app switches to the Preview panel. Rather than maintain a second, more limited capture method, remove it entirely. Removes the JSON-RPC method, IUiBackend/WxUiBackend implementation, dispatcher route + capability entry, the now-dead opt_int/thumbnail_to_wximage helpers and ThumbnailData include, the mock override + unit test, and the Python screenshot_3d client method. Docs updated accordingly.