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Adds a way to run a pass for a viewport that the application paints itself, e.g. into a texture. This is the building block for embedding one egui UI inside another: a scaled, rotated or blurred sub-UI, a minimap, a live preview, or an off-screen capture. The nested-pass machinery already existed for immediate viewports, but two things were missing for an application to use it: * Nothing public sets `ViewportState::used`, so `end_pass` threw the child viewport's state away every pass. Hover, click and drag could never work. * The child appeared in `FullOutput::viewport_output`, so an integration like eframe would open a native window for it. `ViewportClass::Hosted` marks these viewports and keeps them out of `viewport_output`, so the integration never learns they exist. In return the application takes on what a backend normally does: supply the `RawInput`, paint the shapes, apply the texture delta, and act on the platform output. Also derives `Debug` for `ViewportClass`. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>