v0.5.0: Linux support and OpenCode fix

What's New

• Linux local development support — Added session discovery and resume functionality for Linux across all adapters (Claude, Codex, Cursor, OpenCode)
• OpenCode SQLite scanning — Replaced filesystem marker scanning with direct SQLite database queries for reliable session detection in newer OpenCode versions

Technical

• Added Linux adapter discovery paths and terminal detection for Claude, Codex, Cursor, and OpenCode
• Implemented Linux terminal detection and resume launch support with terminal precedence testing
• Fixed Codex resume command to use current codex resume <session> CLI syntax
• Replaced OpenCode filesystem marker scanning with read-only SQLite database queries
• Updated Vite and @vitejs/plugin-react dependencies to latest versions
• Added Linux AppImage build scripts and verification tools
• Version bumped to 0.5.0