LRC-DEV-SOFTPROOF, MENU-CTX-MASK: soft proofing with gamut warnings; mask component menu

Soft proofing (S in the loupe; S in grids stays Expand/Collapse Stack):
- pipeline Proof {space, destWarning, displayWarning}: gamut-map into the
  proof space, show it in the output space; red/blue gamut warnings
  (neutral clipping excluded). CPU only; the GPU path declines proofs.
- RenderJob::with_proof; paper-white surround and Proof Preview label;
  Soft Proofing strip under the histogram (profile, warnings, Create
  Proof Copy = a named virtual copy). view.softProof for control/MCP.
- photo.virtualCopy takes an optional name.

Mask components: MaskComponent.name; mask.component {component, action:
invert|duplicate|delete|rename|op}; right-click / … menu per component,
double-click rename, Intersect button.

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

crates/develop/src/lib.rs

@@ -105,6 +105,7 @@ mod tests {
         s.masks.push(Mask {
             id: 1,
             components: vec![MaskComponent {
+                name: None,
                 op: MaskOp::Add,
                 invert: false,
                 shape: MaskShape::Radial {

crates/develop/src/settings.rs

@@ -786,6 +786,9 @@ pub enum MaskShape {
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct MaskComponent {
+    /// A name given in the Masking panel (Rename); `None` shows the shape's kind.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
     #[serde(default)]
     pub op: MaskOp,
     #[serde(default)]