Initial commit: Triple-C app, container, and CI

Tauri v2 desktop app (React/TypeScript + Rust) for managing
containerized Claude Code environments. Includes Gitea Actions
workflow for building and pushing the sandbox container image,
and a BUILDING.md guide for manual app builds on Linux and Windows.

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

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

@@ -0,0 +1,54 @@
+use tauri::State;
+
+use crate::docker;
+use crate::models::ContainerInfo;
+use crate::AppState;
+
+#[tauri::command]
+pub async fn check_docker() -> Result<bool, String> {
+    docker::check_docker_available().await
+}
+
+#[tauri::command]
+pub async fn check_image_exists() -> Result<bool, String> {
+    docker::image_exists().await
+}
+
+#[tauri::command]
+pub async fn build_image(app_handle: tauri::AppHandle) -> Result<(), String> {
+    use tauri::Emitter;
+    docker::build_image(move |msg| {
+        let _ = app_handle.emit("image-build-progress", msg);
+    })
+    .await
+}
+
+#[tauri::command]
+pub async fn get_container_info(
+    project_id: String,
+    state: State<'_, AppState>,
+) -> Result<Option<ContainerInfo>, String> {
+    let project = state
+        .projects_store
+        .get(&project_id)
+        .ok_or_else(|| format!("Project {} not found", project_id))?;
+    docker::get_container_info(&project).await
+}
+
+#[tauri::command]
+pub async fn list_sibling_containers() -> Result<Vec<serde_json::Value>, String> {
+    let containers = docker::list_sibling_containers().await?;
+    let result: Vec<serde_json::Value> = containers
+        .into_iter()
+        .map(|c| {
+            serde_json::json!({
+                "id": c.id,
+                "names": c.names,
+                "image": c.image,
+                "state": c.state,
+                "status": c.status,
+            })
+        })
+        .collect();
+    Ok(result)
+}