fix(wordpress): remove invalid Attachment search subtype, fix listAuthor input type

- Search Content's "Content Type" dropdown offered Attachment, which maps to
  subtype=attachment. WP core's WP_REST_Post_Search_Handler explicitly
  excludes attachment from valid subtypes (media isn't searchable via
  /search) — selecting it guaranteed a 400 rest_invalid_param. Removed the
  option; only Post/Page (the only valid subtypes) remain.
- listAuthor was declared type: 'string' in the inputs catalog despite being
  Number()-coerced before use, inconsistent with every other ID-like field
  (postId, pageId, categoryId, commentParent, etc. are all 'number').

Found by an independent final pre-merge validation pass, requested before
merge to be certain of full API alignment.

Author: waleedlatif1

apps/sim/blocks/blocks/wordpress.ts

@@ -631,7 +631,6 @@ export const WordPressBlock: BlockConfig<WordPressResponse> = {
         { label: 'All Types', id: '' },
         { label: 'Post', id: 'post' },
         { label: 'Page', id: 'page' },
-        { label: 'Attachment', id: 'attachment' },
       ],
       value: () => '',
       mode: 'advanced',
@@ -1132,7 +1131,7 @@ export const WordPressBlock: BlockConfig<WordPressResponse> = {
     slug: { type: 'string', description: 'URL slug' },
     categories: { type: 'string', description: 'Category IDs (comma-separated)' },
     tags: { type: 'string', description: 'Tag IDs (comma-separated)' },
-    listAuthor: { type: 'string', description: 'Filter posts by author ID' },
+    listAuthor: { type: 'number', description: 'Filter posts by author ID' },
     featuredMedia: { type: 'number', description: 'Featured media ID' },
     // Page inputs
     pageId: { type: 'number', description: 'Page ID' },
@@ -1174,8 +1173,7 @@ export const WordPressBlock: BlockConfig<WordPressResponse> = {
     query: { type: 'string', description: 'Search query' },
     searchType: {
       type: 'string',
-      description:
-        'Content subtype filter (post, page, attachment) — maps to the API subtype param',
+      description: 'Content subtype filter (post, page) — maps to the API subtype param',
     },
     // List inputs
     perPage: { type: 'number', description: 'Results per page' },