A frame with borders tiles unless told to stretch

The fill of a sliced frame defaulted to `Stretch`. It is `Repeat` now, and the Fill dropdown lists
`Repeat` first.

The saved document keeps writing only the fill that differs from the default, so the key it
carries is now `stretch`, and a frame without it repeats. A frame saved before with the key
absent and meaning stretch would therefore tile; none of the stored projects has one - both sliced
frames on the server carry `fill: "repeat"` explicitly, so they draw as before.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/editor/inspector/frameSection.ts

@@ -8,6 +8,7 @@ import type { FrameBorders, TextureAsset, TextureFrame } from '../../core/model/
 import { type PropertyValue, textOf } from '../../core/model/Properties';
 import { findAssetOf, type Project } from '../../core/model/Project';
 import {
+  DEFAULT_FILL,
   frameBorders,
   frameFill,
   frameRect,
@@ -125,16 +126,16 @@ function fillRow(host: InspectorHost, assetId: string, frameId: string): void {
       key: 'fill',
       label: 'Fill',
       kind: 'enum',
-      default: 'stretch',
+      default: DEFAULT_FILL,
       options: [
-        { value: 'stretch', label: 'Stretch' },
         { value: 'repeat', label: 'Repeat' },
+        { value: 'stretch', label: 'Stretch' },
       ],
     },
-    frame ? frameFill(frame) : 'stretch',
+    frame ? frameFill(frame) : DEFAULT_FILL,
     sliceHandlers(host, assetId, frameId, (input, slice) => ({
       ...slice,
-      fill: textOf(input) === 'repeat' ? 'repeat' : 'stretch',
+      fill: textOf(input) === 'stretch' ? 'stretch' : 'repeat',
     })),
   );
   host.fields.set('fill', row);