feat(vscode): customize activity bar and peacock colors

- Adds color customizations for the VS Code activity bar to improve UI
  appearance and consistency.
- Sets Peacock extension color for better workspace identification.

.vscode/settings.json

@@ -0,0 +1,11 @@
+{
+    "workbench.colorCustomizations": {
+        "activityBar.activeBackground": "#6e95c4",
+        "activityBar.background": "#6e95c4",
+        "activityBar.foreground": "#15202b",
+        "activityBar.inactiveForeground": "#15202b99",
+        "activityBarBadge.background": "#edd2de",
+        "activityBarBadge.foreground": "#15202b"
+    },
+    "peacock.color": "#4a7bb5"
+}