fix(icons): put the dev Dock icon on the mac grid and enlarge the mac art

Dev runs replace the Dock icon with public/apple-touch-icon.png, which the
generator rendered full-bleed, so it drew ~24% larger than its Dock
neighbors. Render it from the mac-grid master like the icns targets.

On the 824 grid the plate matches peers, but the girl inside a white tile
with a ring read small; scale her 1.12x about the plate center for every
mac target.

scripts/generate_icons.py

@@ -121,8 +121,10 @@ BORDER_FRACTION = 0.0407747197
 GIRL_BOXES = {
     "squircle-light.svg": (72.149433, 104.703674, 872.767801, 872.767801),
     "squircle-dark.svg": (72.149433, 104.703674, 872.767801, 872.767801),
-    "squircle-mac-light.svg": (157.949166, 184.039504, 702.522501, 702.522501),
-    "squircle-mac-dark.svg": (157.949166, 184.039504, 702.522501, 702.522501),
+    # Mac: the girl scaled 1.12x about the plate center; the plate stays on the
+    # 824 grid, but a white tile with a ring reads small beside full-color peers.
+    "squircle-mac-light.svg": (122.43, 144.84, 786.83, 786.83),
+    "squircle-mac-dark.svg": (122.43, 144.84, 786.83, 786.83),
 }
 # The brand-kit SVG canvas (both girl svgs share this viewBox).
 GIRL_VIEWBOX = 5487.0615
@@ -173,7 +175,8 @@ TARGETS: list[tuple[str, str, object]] = [
     ("apps/desktop/assets/appx/StoreLogo-dark.png", "png_dark", 50),
     ("apps/desktop/assets/appx/Square44x44Logo-dark.png", "png_dark", 44),
     ("apps/desktop/assets/appx/Square150x150Logo-dark.png", "png_dark", 150),
-    ("apps/desktop/public/apple-touch-icon.png", "png", 1024),
+    # The dev-run Dock icon (app.dock.setIcon), so it sits on the mac grid too.
+    ("apps/desktop/public/apple-touch-icon.png", "png_mac", 1024),
     ("apps/desktop/public/nous-girl.png", "girl_light", 256),
     ("apps/desktop/public/nous-girl-dark.png", "girl_dark", 256),
     ("apps/bootstrap-installer/src-tauri/icons/32x32.png", "png", 32),
@@ -458,6 +461,8 @@ def target_bytes(art: IconArt, kind: str, arg: object) -> bytes:
     buf = io.BytesIO()
     if kind == "png":
         save_png(render(art.master, arg), buf)
+    elif kind == "png_mac":
+        save_png(render(art.master_mac, arg), buf)
     elif kind == "png_dark":
         save_png(render(art.master_dark, arg), buf)
     elif kind == "png_white":