fix(dropbox): list_shared_links path omission + list_revisions pagination

Cursor Bugbot flagged two real gaps:
- list_shared_links sent path: "" for root/all, but Dropbox only returns
  every link account-wide when path is omitted entirely; "" scopes to the
  root folder specifically. Now omits the field for root/empty/"/" input.
- list_revisions exposed hasMore but no way to actually fetch more pages
  (Dropbox's before_rev cursor). Added a beforeRev param + advanced-mode
  block field.

A third flagged issue (create_shared_link's error.shared_link_already_exists.metadata
path) was verified against the official sharing.stone spec and confirmed correct
as-is - replied on the PR thread with the citation, no change needed.

Author: waleedlatif1

apps/sim/blocks/blocks/dropbox.ts

@@ -334,6 +334,14 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
       condition: { field: 'operation', value: 'dropbox_list_revisions' },
       mode: 'advanced',
     },
+    {
+      id: 'beforeRev',
+      title: 'Before Revision',
+      type: 'short-input',
+      placeholder: 'Revision from a previous call, to fetch the next page',
+      condition: { field: 'operation', value: 'dropbox_list_revisions' },
+      mode: 'advanced',
+    },
     // Restore operation inputs
     {
       id: 'path',
@@ -442,6 +450,8 @@ Return ONLY the timestamp string - no explanations, no quotes, no extra text.`,
     maxResults: { type: 'number', description: 'Maximum search results' },
     // List shared links inputs
     directOnly: { type: 'boolean', description: 'Only return direct links, not parent folders' },
+    // List revisions input
+    beforeRev: { type: 'string', description: 'Fetch revisions before this one (pagination)' },
     // Restore input
     rev: { type: 'string', description: 'Revision identifier to restore' },
   },

apps/sim/tools/dropbox/list_revisions.ts

@@ -31,6 +31,13 @@ export const dropboxListRevisionsTool: ToolConfig<
       visibility: 'user-only',
       description: 'Maximum number of revisions to return, 1-100 (default: 10)',
     },
+    beforeRev: {
+      type: 'string',
+      required: false,
+      visibility: 'user-only',
+      description:
+        'Only return revisions before this one. Pass the rev of the last revision from a previous call to fetch the next page.',
+    },
   },
 
   request: {
@@ -45,11 +52,17 @@ export const dropboxListRevisionsTool: ToolConfig<
         'Content-Type': 'application/json',
       }
     },
-    body: (params) => ({
-      path: params.path.trim(),
-      mode: 'path',
-      limit: params.limit ?? 10,
-    }),
+    body: (params) => {
+      const body: Record<string, any> = {
+        path: params.path.trim(),
+        mode: 'path',
+        limit: params.limit ?? 10,
+      }
+      if (params.beforeRev) {
+        body.before_rev = params.beforeRev.trim()
+      }
+      return body
+    },
   },
 
   transformResponse: async (response) => {

apps/sim/tools/dropbox/list_shared_links.ts

@@ -55,7 +55,12 @@ export const dropboxListSharedLinksTool: ToolConfig<
       const body: Record<string, any> = {}
       if (params.path) {
         const trimmedPath = params.path.trim()
-        body.path = trimmedPath === '/' ? '' : trimmedPath
+        // Dropbox only returns every shared link on the account when `path` is omitted
+        // entirely; sending "" scopes the results to the root folder instead. Since our UI
+        // tells users "/" means "list all links", omit the field rather than sending "".
+        if (trimmedPath !== '/' && trimmedPath !== '') {
+          body.path = trimmedPath
+        }
       }
       if (params.directOnly !== undefined) body.direct_only = params.directOnly
       if (params.cursor) body.cursor = params.cursor

apps/sim/tools/dropbox/types.ts

@@ -264,6 +264,7 @@ interface DropboxFileRevision {
 export interface DropboxListRevisionsParams extends DropboxBaseParams {
   path: string
   limit?: number
+  beforeRev?: string
 }
 
 export interface DropboxListRevisionsResponse extends ToolResponse {