feat(ui): less confusing empty state for rg ref images

It was easy to misunderstand the empty state for a regional guidance reference image. There was no label, so it seemed like it was the whole region that was empty.

This small change adds the "Reference Image" heading to the empty state, so it's clear that the empty state messaging refers to this reference image, not the whole regional guidance layer.

invokeai/frontend/web/src/features/controlLayers/components/RegionalGuidance/RegionalGuidanceIPAdapterSettingsEmptyState.tsx

@@ -1,7 +1,6 @@
-import { Button, Flex, Text } from '@invoke-ai/ui-library';
+import { Button, Flex, IconButton, Spacer, Text } from '@invoke-ai/ui-library';
 import { useAppDispatch } from 'app/store/storeHooks';
 import { useImageUploadButton } from 'common/hooks/useImageUploadButton';
-import { RegionalGuidanceDeletePromptButton } from 'features/controlLayers/components/RegionalGuidance/RegionalGuidanceDeletePromptButton';
 import { useEntityIdentifierContext } from 'features/controlLayers/contexts/EntityIdentifierContext';
 import { useCanvasIsBusy } from 'features/controlLayers/hooks/useCanvasIsBusy';
 import { rgIPAdapterDeleted } from 'features/controlLayers/store/canvasSlice';
@@ -12,6 +11,7 @@ import { setRegionalGuidanceReferenceImage } from 'features/imageActions/actions
 import { activeTabCanvasRightPanelChanged } from 'features/ui/store/uiSlice';
 import { memo, useCallback, useMemo } from 'react';
 import { Trans, useTranslation } from 'react-i18next';
+import { PiXBold } from 'react-icons/pi';
 import type { ImageDTO } from 'services/api/types';
 
 type Props = {
@@ -47,27 +47,44 @@ export const RegionalGuidanceIPAdapterSettingsEmptyState = memo(({ referenceImag
   );
 
   return (
-    <Flex flexDir="column" gap={3} position="relative" w="full" p={4}>
-      <RegionalGuidanceDeletePromptButton onDelete={onDeleteIPAdapter} position="absolute" top={0} insetInlineEnd={0} />
-      <Text textAlign="center" color="base.300">
-        <Trans
-          i18nKey="controlLayers.referenceImageEmptyState"
-          components={{
-            UploadButton: (
-              <Button
-                isDisabled={isBusy}
-                size="sm"
-                variant="link"
-                color="base.300"
-                {...uploadApi.getUploadButtonProps()}
-              />
-            ),
-            GalleryButton: (
-              <Button onClick={onClickGalleryButton} isDisabled={isBusy} size="sm" variant="link" color="base.300" />
-            ),
-          }}
+    <Flex flexDir="column" gap={2} position="relative" w="full">
+      <Flex alignItems="center" gap={2}>
+        <Text fontWeight="semibold" color="base.400">
+          {t('controlLayers.referenceImage')}
+        </Text>
+        <Spacer />
+        <IconButton
+          size="sm"
+          variant="link"
+          alignSelf="stretch"
+          icon={<PiXBold />}
+          tooltip={t('controlLayers.deleteReferenceImage')}
+          aria-label={t('controlLayers.deleteReferenceImage')}
+          onClick={onDeleteIPAdapter}
+          colorScheme="error"
         />
-      </Text>
+      </Flex>
+      <Flex alignItems="center" gap={2} p={4}>
+        <Text textAlign="center" color="base.300">
+          <Trans
+            i18nKey="controlLayers.referenceImageEmptyState"
+            components={{
+              UploadButton: (
+                <Button
+                  isDisabled={isBusy}
+                  size="sm"
+                  variant="link"
+                  color="base.300"
+                  {...uploadApi.getUploadButtonProps()}
+                />
+              ),
+              GalleryButton: (
+                <Button onClick={onClickGalleryButton} isDisabled={isBusy} size="sm" variant="link" color="base.300" />
+              ),
+            }}
+          />
+        </Text>
+      </Flex>
       <input {...uploadApi.getUploadInputProps()} />
       <DndDropTarget
         dndTarget={setRegionalGuidanceReferenceImageDndTarget}