refactor: replace type catch-all with generic ComponentAttrs in showLayoutDialog (#8571)

## Summary

Replaces `Record<string, unknown>` catch-all with properly typed generic
props in `showLayoutDialog`, improving type safety.

## Changes

- Made `showLayoutDialog` generic over component type `C extends
Component`
- Changed props type from `{ onClose: () => void } & Record<string,
unknown>` to `ComponentAttrs<C> & { onClose: () => void }`

This matches existing patterns used elsewhere in `dialogService.ts`
(e.g., `showLoadWorkflowWarning`, `showMissingModelsWarning`).

Fixes #8102

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Dialog handling updated to infer props per component, resulting in
more consistent and reliable dialog behavior and fewer runtime prop
mismatches when opening dialogs. Developers will have clearer, safer
dialog configuration, while end users should experience steadier dialog
interactions. No visible UI changes are expected.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8571-fix-replace-type-catch-all-with-generic-ComponentAttrs-in-showLayoutDialog-2fc6d73d36508104bf60d27c9b94af69)
by [Unito](https://www.unito.io)

src/services/dialogService.ts

@@ -456,10 +456,10 @@ export const useDialogService = () => {
     }
   }
 
-  function showLayoutDialog(options: {
+  function showLayoutDialog<C extends Component>(options: {
     key: string
-    component: Component
-    props: { onClose: () => void } & Record<string, unknown>
+    component: C
+    props: ComponentAttrs<C>
     dialogComponentProps?: DialogComponentProps
   }) {
     const layoutDefaultProps: DialogComponentProps = {