Optional supersampling (SSAA) for the viewport, adaptive and capped to the texture limit (#1288) (#1321)

* Optional supersampling (SSAA) for the viewport, adaptive and within the texture limit (#1288)

Preferences ▸ Graphics ▸ Supersampling: Off (default), 1.5× or 2×. The frame is drawn into
textures of the viewport's own kind (format, depth/stencil, MSAA) at that multiple of its pixels,
over transparent black, then filtered down into the viewport with four bilinear taps (the exact
2 × 2 box at 2×) and composited premultiplied over the background. Lines keep their on-screen
width; silhouettes and edges come out smoother.

Adaptive (on by default): the view is drawn at full speed while the camera moves and
supersampled once it has held still for a quarter of a second.

The supersampled size stays within the device's largest texture side (#869) and a 384 MiB
budget for colour and depth (MSAA samples included); under 1.25× is not worth it and the frame
is drawn as usual.

Labels in en/de/ja/ko/zh; `ui.prefs` `supersampling` and `supersampling_adaptive`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Supersampling: factor and adaptive on one row; Off reads Off (1×)

The Graphics page grew past the colour vision menu in the preferences scenario, and a second
Off on the page took its click.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/render_workspace.rs

@@ -525,6 +525,7 @@ pub fn show(app: &mut SolveApp, ui: &mut egui::Ui) {
             access: None,
             outline: false,
             eye: [eye.x as f32, eye.y as f32, eye.z as f32, if camera.fov > 0.0 { 1.0 } else { 0.0 }],
+            ssaa: 1.0,
         };
         ui.painter().add(egui_wgpu::Callback::new_paint_callback(rect, callback));
         Ok(())