Now with Document Synopsis

• AI Synopsis with Ollama: click any document for a Kindle-style synopsis, generated on demand and cached after first generation (now using dolphin3:latest)
• Auto-pull support for both required Ollama models (embedding + synopsis) — start verifies/installs/pulls as needed
• Expanded scan coverage: source-code extensions (Rust, C/C++, Go, Java, TS/JS, Ruby, PHP, TOML) now indexed and tagged
• report/scan type lists now derive from a single source of truth (scan_docs.DEFAULT_EXTENSIONS)
• New README Screenshots section with light/dark mode, settings, and synopsis screenshots