scaffolder: address copilot review feedback

- Use translation key for "No schema defined" fallback instead of hardcoded string
- Add aria-label to the enum format button for accessibility
- Remove unnecessary `as any` casts on defaultWidth column config
- Fix "Github" -> "GitHub" capitalization in test data
- Update changeset wording to match actual sidebar list UI

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

.changeset/scaffolder-actions-page-table.md

@@ -2,4 +2,4 @@
 '@backstage/plugin-scaffolder': patch
 ---
 
-Migrated the actions page to use `@backstage/ui` table and search components. Actions are now listed in a table with aligned name and description columns, with click-to-expand detail view and built-in search filtering.
+Migrated the actions page to use `@backstage/ui` list and search components. Actions are now presented in a sidebar list with a separate detail panel for the selected action, along with built-in search filtering.

plugins/scaffolder/src/components/ActionsPage/ActionsPage.test.tsx

@@ -606,7 +606,7 @@ describe('ActionsPage', () => {
     scaffolderApiMock.listActions.mockResolvedValue([
       {
         id: 'github:repo:create',
-        description: 'Create a new Github repository',
+        description: 'Create a new GitHub repository',
         schema: {
           input: {
             type: 'object',
@@ -622,7 +622,7 @@ describe('ActionsPage', () => {
       },
       {
         id: 'github:repo:push',
-        description: 'Push to a Github repository',
+        description: 'Push to a GitHub repository',
         schema: {
           input: {
             type: 'object',
@@ -682,7 +682,7 @@ describe('ActionsPage', () => {
     scaffolderApiMock.listActions.mockResolvedValue([
       {
         id: 'github:repo:create',
-        description: 'Create a new Github repository',
+        description: 'Create a new GitHub repository',
         schema: {},
       },
     ]);

plugins/scaffolder/src/components/RenderSchema/RenderSchema.tsx

@@ -199,6 +199,7 @@ export const RenderEnum: FC<{
                     data-testid={`wrap-text_${i}`}
                     variant="tertiary"
                     size="small"
+                    aria-label="Show formatted value"
                   >
                     ↵
                   </Button>
@@ -242,7 +243,7 @@ export const RenderSchema = ({
             id: 'value',
             label: t('renderSchema.tableCell.value'),
             isRowHeader: true,
-            defaultWidth: '3fr' as any,
+            defaultWidth: '3fr',
             cell: item => <ValueCell item={item} context={context} />,
           },
         ]
@@ -270,7 +271,7 @@ export const RenderSchema = ({
           {
             id: 'value',
             label: t('renderSchema.tableCell.value'),
-            defaultWidth: '1fr' as any,
+            defaultWidth: '1fr',
             cell: item => <ValueCell item={item} context={context} />,
           },
         ];
@@ -349,7 +350,7 @@ export const RenderSchema = ({
     }
     return undefined;
   })();
-  return result ?? <Text as="p">No schema defined</Text>;
+  return result ?? <Text as="p">{t('renderSchema.undefined')}</Text>;
 };
 
 function RenderExpansion({