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/terminal/TerminalTabs.tsx

@@ -0,0 +1,41 @@
+import { useTerminal } from "../../hooks/useTerminal";
+
+export default function TerminalTabs() {
+  const { sessions, activeSessionId, setActiveSession, close } = useTerminal();
+
+  if (sessions.length === 0) {
+    return (
+      <div className="px-3 text-xs text-[var(--text-secondary)] leading-10">
+        No active terminals
+      </div>
+    );
+  }
+
+  return (
+    <div className="flex items-center h-full">
+      {sessions.map((session) => (
+        <div
+          key={session.id}
+          onClick={() => setActiveSession(session.id)}
+          className={`flex items-center gap-2 px-3 h-full text-xs cursor-pointer border-r border-[var(--border-color)] transition-colors ${
+            activeSessionId === session.id
+              ? "bg-[var(--bg-primary)] text-[var(--text-primary)]"
+              : "text-[var(--text-secondary)] hover:text-[var(--text-primary)]"
+          }`}
+        >
+          <span className="truncate max-w-[120px]">{session.projectName}</span>
+          <button
+            onClick={(e) => {
+              e.stopPropagation();
+              close(session.id);
+            }}
+            className="text-[var(--text-secondary)] hover:text-[var(--error)] transition-colors"
+            title="Close terminal"
+          >
+            ×
+          </button>
+        </div>
+      ))}
+    </div>
+  );
+}