Enhance color logic for phantom elements to improve visual distinction based on collision status (#42710)

This change modifies the color assignment for phantom elements in the
editor. If a phantom element collides with existing elements, it now
uses a custom color based on the theme's debugger accent with reduced
opacity. Otherwise, it defaults to the hint color.

BEFORE:
![20251114-0939-17
9919633](https://github.com/user-attachments/assets/4ec56f03-4708-4b35-b1ab-abdfd41c763e)

AFTER:
![20251114-0942-38
8596606](https://github.com/user-attachments/assets/6e9a98f1-a34d-4676-9dc6-b3e2b9f967bc)


Release Notes:

- Enhanced color logic for phantom elements to improve visual
distinction based on collision status.

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/editor/src/editor.rs

@@ -8420,8 +8420,14 @@ impl Editor {
                 (true, true) => ui::IconName::DebugDisabledLogBreakpoint,
             };
 
+            let color = cx.theme().colors();
+
             let color = if is_phantom {
-                Color::Hint
+                if collides_with_existing {
+                    Color::Custom(color.debugger_accent.blend(color.text.opacity(0.6)))
+                } else {
+                    Color::Hint
+                }
             } else if is_rejected {
                 Color::Disabled
             } else {