v0.2.0-alpha.4

Summary

• Appbar collapses to a compact horizontal icon strip on double-click (same grid-template-rows animation as widget sections); auto-collapses when a track finishes processing
• Collapsed strip shows: SD monogram · URL icon · per-stem colored squares (active/inactive state) · Process button — all clickable
• Clicking stem squares toggles selection; Process submits if URL is already set, otherwise expands; SD/URL icon always expands
• Brand subtitle shortened to "AI stem separation"
• Version label (v0.1.0) added to brand area with optional green "New release available" chip that fetches the latest tag from the GitHub releases API on load
• Fixed footer button underline and icon sizing

Artifact scan

• Windows portable packages were scanned with ClamAV in CI before upload.