Fix album art zoom's rest frame differing from zoom-off's static frame

zoom_level=off skipped animation.Transformation entirely, rendering the
art as a bare Image in a Box. Every other zoom level wrapped the same
Image in a Transformation. Empirically, that wrapper shifts the crop by a
couple pixels versus the bare Image, even at an explicit identity
Scale(1.0, 1.0) keyframe -- so "off" and the rest state of every other
zoom level didn't actually agree on framing, despite both nominally being
scale 1.0. That's what looked like the zoom always starting "a little
zoomed in" relative to off.

Fix: always go through the same Transformation, using a degenerate
animation (identical Scale(1.0, 1.0) keyframes, no visible movement) for
zoom_level=off. Verified pixel-identical (AE=0) first frames across off/
subtle/moderate/strong against the same live track.

subwave_nowplaying.star

@@ -213,9 +213,17 @@ ART_ZOOM_DURATION = 200  # 10s round-trip (5s in, 5s out) at the default 50ms/ti
 
 def _art_widget(art_bytes, zoom_scale):
     art = render.Image(src = art_bytes, width = ART_SIZE, height = ART_SIZE)
-    if zoom_scale <= 1.0:
-        return render.Box(width = ART_SLOT, height = ART_SLOT, child = art)
 
+    # Always route through animation.Transformation, even when zoom is off
+    # (a degenerate animation whose two keyframes are both Scale(1.0, 1.0),
+    # i.e. no visible movement). Wrapping the art in a Transformation shifts
+    # its crop by a few pixels versus a bare, unwrapped Image in the same
+    # Box -- confirmed empirically, even at an explicit Scale(1.0, 1.0) --
+    # so a plain-Image "off" path and a Transformation-wrapped zoom path
+    # don't actually agree on framing despite both nominally being "scale
+    # 1.0". Using the same wrapper unconditionally guarantees the "off"
+    # state and the rest state of every zoom level line up exactly.
+    top_scale = max(zoom_scale, 1.0)
     zoom = animation.Transformation(
         child = art,
         duration = ART_ZOOM_DURATION,
@@ -226,7 +234,7 @@ def _art_widget(art_bytes, zoom_scale):
             ),
             animation.Keyframe(
                 percentage = 0.5,
-                transforms = [animation.Scale(zoom_scale, zoom_scale)],
+                transforms = [animation.Scale(top_scale, top_scale)],
                 curve = "ease_in_out",
             ),
             animation.Keyframe(