0.2.1

• New app icon — Sift now has its own teal icon in the taskbar and Start menu.
• Download page — the README links a one-click "latest" installer; the app keeps updating itself after that.
• Copy a video's URL with one click from its detail page (with a "Copied" confirmation).
• The sidebar Library button now returns to the list from a video's detail page.
• Settings is now organized into tabs: General, Transcription, AI, System.
• Queue is clearer: labeled fields, "Video & Audio" / "Best available" wording, and tag suggestions as you type.
• Slides: a clear Remove slide region button when a region is set.