v2.0.6

• Fixed audio and video downloads sharing the same output directory; queued items now use their configured video or audio output folder
• Added per-item download option building so the active tab no longer changes queued downloads
• Extracted pure option-building helper to src/lib/buildDownloadOptions with tests
• Project hygiene (2.0.5): added ESLint, unified the preload build, centralized default preferences, cleaned up renderer IPC listeners, extracted DownloadParser, and added AGENTS.md