refactor: node color is config-owned; drop the Network Settings params

Remove the Node Color R/G/B spinboxes from the settings pane and their
apply arms — node_color already loads from config.kdl
(style.surface.graph.node.color) and refreshes on config reload, so the
params were an override layered on the config value. Older saves carry
the params in the Main node, so project load now strips them.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/project.rs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/src/project.rs b/src/project.rs
index 09b1b94..339dd99 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -361,9 +361,9 @@ impl State {
         // Network Settings
         ensure_param(main_node, "Network Settings", "section", "", &[], None, None, None);
         ensure_param(main_node, "Circular Pane", "choice", if self.circular_network_pane { "true" } else { "false" }, &["false", "true"], None, None, None);
-        ensure_param(main_node, "Node Color R", "spinbox", &((self.node_color[0] * 255.0) as i32).to_string(), &[], Some(0.0), Some(255.0), Some(1.0));
-        ensure_param(main_node, "Node Color G", "spinbox", &((self.node_color[1] * 255.0) as i32).to_string(), &[], Some(0.0), Some(255.0), Some(1.0));
-        ensure_param(main_node, "Node Color B", "spinbox", &((self.node_color[2] * 255.0) as i32).to_string(), &[], Some(0.0), Some(255.0), Some(1.0));
+        // Node color is config-owned (style.surface.graph.node.color in
+        // config.kdl) — drop the retired per-project params from older saves.
+        main_node.params.retain(|p| !matches!(p.name.as_str(), "Node Color R" | "Node Color G" | "Node Color B"));
 
         // Viewport Settings
 
@@ -400,9 +400,6 @@ impl State {
             for p in &params {
                 match p.name.as_str() {
                     // Network Settings
-                    "Node Color R" => if let Ok(val) = p.default.parse::<f32>() { self.node_color[0] = val / 255.0; }
-                    "Node Color G" => if let Ok(val) = p.default.parse::<f32>() { self.node_color[1] = val / 255.0; }
-                    "Node Color B" => if let Ok(val) = p.default.parse::<f32>() { self.node_color[2] = val / 255.0; }
                     "Circular Pane" => if let Ok(val) = p.default.parse::<bool>() { self.circular_network_pane = val; }
 
                     // Viewport Settings