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/hooks/useProjects.ts

@@ -0,0 +1,91 @@
+import { useCallback } from "react";
+import { useAppState } from "../store/appState";
+import * as commands from "../lib/tauri-commands";
+
+export function useProjects() {
+  const {
+    projects,
+    selectedProjectId,
+    setProjects,
+    setSelectedProject,
+    updateProjectInList,
+    removeProjectFromList,
+  } = useAppState();
+
+  const selectedProject = projects.find((p) => p.id === selectedProjectId) ?? null;
+
+  const refresh = useCallback(async () => {
+    const list = await commands.listProjects();
+    setProjects(list);
+  }, [setProjects]);
+
+  const add = useCallback(
+    async (name: string, path: string) => {
+      const project = await commands.addProject(name, path);
+      // Refresh from backend to avoid stale closure issues
+      const list = await commands.listProjects();
+      setProjects(list);
+      setSelectedProject(project.id);
+      return project;
+    },
+    [setProjects, setSelectedProject],
+  );
+
+  const remove = useCallback(
+    async (id: string) => {
+      await commands.removeProject(id);
+      removeProjectFromList(id);
+    },
+    [removeProjectFromList],
+  );
+
+  const start = useCallback(
+    async (id: string) => {
+      const updated = await commands.startProjectContainer(id);
+      updateProjectInList(updated);
+      return updated;
+    },
+    [updateProjectInList],
+  );
+
+  const stop = useCallback(
+    async (id: string) => {
+      await commands.stopProjectContainer(id);
+      const list = await commands.listProjects();
+      setProjects(list);
+    },
+    [setProjects],
+  );
+
+  const rebuild = useCallback(
+    async (id: string) => {
+      const updated = await commands.rebuildProjectContainer(id);
+      updateProjectInList(updated);
+      return updated;
+    },
+    [updateProjectInList],
+  );
+
+  const update = useCallback(
+    async (project: Parameters<typeof commands.updateProject>[0]) => {
+      const updated = await commands.updateProject(project);
+      updateProjectInList(updated);
+      return updated;
+    },
+    [updateProjectInList],
+  );
+
+  return {
+    projects,
+    selectedProject,
+    selectedProjectId,
+    setSelectedProject,
+    refresh,
+    add,
+    remove,
+    start,
+    stop,
+    rebuild,
+    update,
+  };
+}