SQLite database, Sentry tracking, and Features section

SQLite Local Database #477

• Desktop app now uses a local SQLite-backed database with automatic migration from the legacy JSON store
• Adds @superset/local-db package with Drizzle ORM schema for SQLite
• Migrates all database operations from lowdb (db.json) to SQLite using better-sqlite3
• UUID defaults for all ID fields (prep for local-first architecture)

Sentry Error Tracking #484

• Added error tracking and monitoring to the desktop application for improved stability reporting
• Add Sentry integration for main and renderer processes
• Add tRPC middleware to automatically capture all backend errors with proper context (path, type, code)
• Added developer testing tools to validate error reporting functionality

Features and FAQ Sections #472

• Add Features section with alternating text/image layout showcasing Parallel Agents, Universal CLI Support, and Git Worktree Integration
• Add FAQ section with two-column layout and smooth accordion animations
• Custom accordion with plus icon (rotates to X when open)
• Multiple interactive demos (file/diff, IDE file-tree, terminal, compatibility, parallel execution)