Fix Cypress outfit snapshot positioning (a hack!)

cypress/integration/WardrobePage/page.js

@@ -15,8 +15,26 @@ export function getPosePickerOption(label, options) {
 }
 
 export function getOutfitPreview() {
-  return cy.get("[data-test-id=wardrobe-outfit-preview]:not([data-loading])", {
-    // A bit of an extra-long timeout, to await both server data and image data
-    timeout: 15000,
-  });
+  // HACK: To return the screenshottable preview *area* (which is what this
+  //       function is currently used for), we select the first img tag. That's
+  //       because the app relies on CSS `object-fit` to get images to position
+  //       correctly, rather than styling the container. This will still
+  //       screenshot the full preview, because Cypress can't separate the
+  //       layers! It just screenshots the bounded area.
+  //
+  // TODO: The way the layer positioning works is a bit fragile tbh, and the
+  //       canvases already do math; it could make sense to just have the
+  //       container use the same math, or some clever CSS?
+  //
+  // NOTE: The tests need to run in a 600x600 actual window, or else the
+  //       snapshot will come out smaller. This because our snapshot plugin
+  //       performs its snapshot within the window's natural area, rather than
+  //       the simulated area that most tests run in.
+  return cy
+    .get("[data-test-id=wardrobe-outfit-preview]:not([data-loading])", {
+      // A bit of an extra-long timeout, to await both server data and image data
+      timeout: 15000,
+    })
+    .get("img")
+    .first();
 }