Fix icon path and Y positioning

- Read icons/cut.png (not cut.png) to match embed directive
- Offset icon Y by iconSize so bottom aligns with text baseline
- drawText uses baseline positioning, drawPng uses top-left corner

internal/ui/render.go

@@ -37,7 +37,7 @@ func New(th Theme, shp *text.Shaper) *Renderer {
 
 // loadIcons loads PNG icons from the embedded filesystem.
 func (r *Renderer) loadIcons() {
-	data, err := iconFS.ReadFile("cut.png")
+	data, err := iconFS.ReadFile("icons/cut.png")
 	if err != nil {
 		return
 	}