refactor: standardize design

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/types/index.ts

@@ -28,3 +28,23 @@ export interface ContextMenuAction {
   disabled?: boolean
   divider?: boolean
 }
+
+/**
+ * Shape of an item registered at the `documents_file_viewer` integration point.
+ * Stored under `meta` so it fits inside a standard `ModuleIntegrationItem`.
+ */
+export interface DocumentViewerMeta {
+  /** Exact MIME type matches, e.g. ['application/pdf'] */
+  mimeTypes?: string[]
+  /** Glob-style patterns, e.g. ['image/*', 'video/*'] */
+  mimePatterns?: string[]
+}
+
+export interface DocumentViewerItem {
+  id: string
+  label?: string
+  priority?: number
+  meta: DocumentViewerMeta
+  /** Async factory returning the Vue viewer component */
+  component: () => Promise<unknown>
+}