Update volume mount configuration in devcontainer.json to use shared owner username

Author: chapterjason

.devcontainer/devcontainer.json

@@ -11,7 +11,7 @@
   "remoteUser": "${localEnv:DEVCONTAINER_USERNAME:dev}",
   "containerUser": "${localEnv:DEVCONTAINER_USERNAME:dev}",
   "mounts": [
-    "source=devcontainer-home-${devcontainerId},target=/home/${localEnv:DEVCONTAINER_USERNAME:dev},type=volume"
+    "source=devhome-${localEnv:OWNER_USERNAME:shared},target=/home/${localEnv:DEVCONTAINER_USERNAME:dev},type=volume"
   ],
   "features": {
     "ghcr.io/sourecode/devcontainer-features/claude-code:1": {},