Fix docker socket not mounting when toggling container spawning

When "Allow container spawning" was toggled on an existing container,
the docker socket mount was never applied because the container was
simply restarted rather than recreated. Now inspects the existing
container's mounts and recreates it when there's a mismatch, preserving
the named config volume (keyed by project ID) across recreation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src-tauri/src/commands/project_commands.rs

@@ -102,9 +102,37 @@ pub async fn start_project_container(
 
     // Check for existing container
     let container_id = if let Some(existing_id) = docker::find_existing_container(&project).await? {
-        // Start existing container
-        docker::start_container(&existing_id).await?;
-        existing_id
+        // Check if docker socket mount matches the current project setting.
+        // If the user toggled "Allow container spawning" after the container was
+        // created, we need to recreate the container for the mount change to take
+        // effect.
+        let has_socket = docker::container_has_docker_socket(&existing_id).await.unwrap_or(false);
+        if has_socket != project.allow_docker_access {
+            log::info!(
+                "Docker socket mismatch (container has_socket={}, project wants={}), recreating container",
+                has_socket, project.allow_docker_access
+            );
+            // Safe to remove and recreate: the claude config named volume is
+            // keyed by project ID (not container ID) so it persists across
+            // container recreation. Bind mounts (workspace, SSH, AWS) are
+            // host paths and are unaffected.
+            let _ = docker::stop_container(&existing_id).await;
+            docker::remove_container(&existing_id).await?;
+            let new_id = docker::create_container(
+                &project,
+                api_key.as_deref(),
+                &docker_socket,
+                &image_name,
+                aws_config_path.as_deref(),
+                &settings.global_aws,
+            ).await?;
+            docker::start_container(&new_id).await?;
+            new_id
+        } else {
+            // Start existing container as-is
+            docker::start_container(&existing_id).await?;
+            existing_id
+        }
     } else {
         // Create new container
         let new_id = docker::create_container(

app/src-tauri/src/docker/container.rs

@@ -288,6 +288,27 @@ pub async fn remove_container(container_id: &str) -> Result<(), String> {
         .map_err(|e| format!("Failed to remove container: {}", e))
 }
 
+/// Check whether an existing container has docker socket mounted.
+pub async fn container_has_docker_socket(container_id: &str) -> Result<bool, String> {
+    let docker = get_docker()?;
+    let info = docker
+        .inspect_container(container_id, None)
+        .await
+        .map_err(|e| format!("Failed to inspect container: {}", e))?;
+
+    let has_socket = info
+        .host_config
+        .and_then(|hc| hc.mounts)
+        .map(|mounts| {
+            mounts.iter().any(|m| {
+                m.target.as_deref() == Some("/var/run/docker.sock")
+            })
+        })
+        .unwrap_or(false);
+
+    Ok(has_socket)
+}
+
 pub async fn get_container_info(project: &Project) -> Result<Option<ContainerInfo>, String> {
     if let Some(ref container_id) = project.container_id {
         let docker = get_docker()?;