style(vscode): customize activity bar and peacock colors

- Add color customizations for the activity bar in VS Code
- Set Peacock extension color for consistent UI theming

.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"
+}