Bump version to 0.4.1

[svekars]

pytorch_sphinx_theme2 v0.4.1

New Features

• Dropdown Navigation Menus — The horizontal navbar now supports hierarchical dropdown menus. Top-level toctree entries with children display hover-activated dropdowns on desktop. Overflow items collapse into a "More" dropdown. External URLs are supported with target="_blank" and an external link icon. Configurable via enable_navbar_dropdowns theme option (default: true).

• LLM Discovery Support (llms.txt + Meta Tags) — Automatically generates an llms.txt file at build time listing all documentation pages as Markdown links, following the llms.txt standard. Every page also includes machine-readable tags (site-type, framework, description, version, page-type, navigation-file, sitemap). Configured via llm_domain, llm_base_path, llm_description, and llm_disabled theme options.

• RunLLM Widget Integration — AI-powered documentation assistant widget. Enable by setting runllm_assistant_id in theme options. Additional options: runllm_name, runllm_position, runllm_keyboard_shortcut.

• Sphinx-Tippy Parallel Build Fix — Fixes tooltip data loss when using sphinx-tippy with parallel Sphinx builds. Glossary terms are now extracted during the read phase and properly merged across workers. Configurable glossary page via tippy_glossary_page setting.

UI/Layout Improvements

• Responsive Layout Overhaul — Wide screen content capped at max-width: 1800px with auto centering. Progressive navbar font/padding compaction across three breakpoints to prevent wrapping. Adaptive header padding (2rem desktop, 0.1rem mobile).
• Auto-Hide Empty Sidebar — Left sidebar automatically hides via CSS when it contains no navigation items, with main content padding adjusted accordingly.
• Smooth Scroll with TOC Locking — Custom smooth scroll animation (150ms ease-out-cubic). Clicking an anchor link locks the TOC highlight to that target until the user manually scrolls.

Bug Fixes

• Fixed broken external links in the navigation bar
• Fixed top padding layout issue on mobile
• Updated PyTorch library links to include only libraries in the official PyTorch GitHub org (ExecuTorch, Helion, torchao, kineto, torchtitan, TorchRL, torchvision, torchaudio, tensordict, PyTorch on XLA Devices)

Documentation

• Added comprehensive configuration reference documentation (~800 lines) covering all theme options with examples
  Infrastructure

Modernized CI workflows

• Added theme build job
• Added Netlify documentation preview support
• Added S3 documentation preview upload

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