Keep clarity's radius when the develop view zooms in

A frame fraction was taken of the render's short edge, and render_scale
folds the zoom into the region the render stands for. Zoomed to 1:1 on a
corner, clarity, texture and dehaze drew a quarter of the halo the export
gets, though the docs promise they preview honestly at any zoom.
RenderScale now carries the whole framed frame (within), and a frame
fraction is measured against it; at fit nothing changes.

core/dr-pipeline/src/graph.rs

@@ -952,7 +952,7 @@ impl EditGraph {
             ((fw as f32 * view.width).round() as u32).max(1),
             ((fh as f32 * view.height).round() as u32).max(1),
         );
-        crate::detail::RenderScale::new(render, full)
+        crate::detail::RenderScale::new(render, full).within((fw, fh))
     }
 
     /// TRACES: FR-DEV-3 | FR-DSP-1