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/layout/StatusBar.tsx

@@ -0,0 +1,22 @@
+import { useAppState } from "../../store/appState";
+
+export default function StatusBar() {
+  const { projects, sessions } = useAppState();
+  const running = projects.filter((p) => p.status === "running").length;
+
+  return (
+    <div className="flex items-center h-6 px-3 bg-[var(--bg-tertiary)] border border-[var(--border-color)] rounded-lg text-xs text-[var(--text-secondary)]">
+      <span>
+        {projects.length} project{projects.length !== 1 ? "s" : ""}
+      </span>
+      <span className="mx-2">|</span>
+      <span>
+        {running} running
+      </span>
+      <span className="mx-2">|</span>
+      <span>
+        {sessions.length} terminal{sessions.length !== 1 ? "s" : ""}
+      </span>
+    </div>
+  );
+}