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/components/projects/ProjectList.tsx

@@ -0,0 +1,40 @@
+import { useState } from "react";
+import { useProjects } from "../../hooks/useProjects";
+import ProjectCard from "./ProjectCard";
+import AddProjectDialog from "./AddProjectDialog";
+
+export default function ProjectList() {
+  const { projects } = useProjects();
+  const [showAdd, setShowAdd] = useState(false);
+
+  return (
+    <div className="p-2">
+      <div className="flex items-center justify-between px-2 py-1 mb-2">
+        <span className="text-xs font-semibold uppercase text-[var(--text-secondary)]">
+          Projects
+        </span>
+        <button
+          onClick={() => setShowAdd(true)}
+          className="text-lg leading-none text-[var(--text-secondary)] hover:text-[var(--accent)] transition-colors"
+          title="Add project"
+        >
+          +
+        </button>
+      </div>
+
+      {projects.length === 0 ? (
+        <p className="px-2 text-sm text-[var(--text-secondary)]">
+          No projects yet. Click + to add one.
+        </p>
+      ) : (
+        <div className="flex flex-col gap-1">
+          {projects.map((project) => (
+            <ProjectCard key={project.id} project={project} />
+          ))}
+        </div>
+      )}
+
+      {showAdd && <AddProjectDialog onClose={() => setShowAdd(false)} />}
+    </div>
+  );
+}