Add initial collaborator colors

Nate created 

* Define host selection color
* Add 7 unique guest colors, optimizing for contrast between selectors the fewer collaborators you have
* Selections use transparent versions of the cursor color

Change summary

zed/assets/themes/black.toml | 14 +++++++++++---
zed/assets/themes/dark.toml  | 12 ++++++++++--
zed/assets/themes/light.toml | 12 ++++++++++--
3 files changed, 31 insertions(+), 7 deletions(-)

Detailed changes

zed/assets/themes/black.toml 🔗 

@@ -19,8 +19,16 @@ base = { family = "Inconsolata", size = 15 }
 0 = "#00000052"
 
 [selection]
-host = { selection = "#264f78", cursor = "$text.0.color" }
-guests = [{ selection = "#504f31", cursor = "#fcf154" }]
+host = { selection = "#3B57BC33", cursor = "$text.0.color" }
+guests = [
+  { selection = "#FDF35133", cursor = "#FDF351" },
+  { selection = "#4EACAD33", cursor = "#4EACAD" },
+  { selection = "#D0453B33", cursor = "#D0453B" },
+  { selection = "#3B874B33", cursor = "#3B874B" },
+  { selection = "#BD7CB433", cursor = "#BD7CB4" },
+  { selection = "#EE823133", cursor = "#EE8231" },
+  { selection = "#5A2B9233", cursor = "#5A2B92" }
+]
 
 [status]
 good = "#4fac63"
@@ -41,4 +49,4 @@ number = "#b5cea8"
 comment = "#6a9955"
 property = "#4e94ce"
 variant = "#4fc1ff"
-constant = "#9cdcfe"
+constant = "#9cdcfe"

zed/assets/themes/dark.toml 🔗 

@@ -19,8 +19,16 @@ base = { family = "Inconsolata", size = 15 }
 0 = "#00000052"
 
 [selection]
-host = { selection = "#264f78", cursor = "$text.0.color" }
-guests = [{ selection = "#504f31", cursor = "#fcf154" }]
+host = { selection = "#3B57BC33", cursor = "$text.0.color" }
+guests = [
+  { selection = "#FDF35133", cursor = "#FDF351" },
+  { selection = "#4EACAD33", cursor = "#4EACAD" },
+  { selection = "#D0453B33", cursor = "#D0453B" },
+  { selection = "#3B874B33", cursor = "#3B874B" },
+  { selection = "#BD7CB433", cursor = "#BD7CB4" },
+  { selection = "#EE823133", cursor = "#EE8231" },
+  { selection = "#5A2B9233", cursor = "#5A2B92" }
+]
 
 [status]
 good = "#4fac63"

zed/assets/themes/light.toml 🔗 

@@ -19,8 +19,16 @@ base = { family = "Inconsolata", size = 15 }
 0 = "#0000000D"
 
 [selection]
-host = { selection = "#D4D9EE", cursor = "$text.0.color" }
-guests = [{ selection = "#504f31", cursor = "#fcf154" }]
+host = { selection = "#3B57BC33", cursor = "$text.0.color" }
+guests = [
+  { selection = "#FDF35133", cursor = "#FDF351" },
+  { selection = "#4EACAD33", cursor = "#4EACAD" },
+  { selection = "#D0453B33", cursor = "#D0453B" },
+  { selection = "#3B874B33", cursor = "#3B874B" },
+  { selection = "#BD7CB433", cursor = "#BD7CB4" },
+  { selection = "#EE823133", cursor = "#EE8231" },
+  { selection = "#5A2B9233", cursor = "#5A2B92" }
+]
 
 [status]
 good = "#4fac63"