fix(sendgrid): document consistent page_size requirement for list_templates pagination

Per Cursor Bugbot: list_templates always defaults page_size to 20
when unset (required by SendGrid), so a follow-up pageToken-only
call after a first call with a larger pageSize would silently
shrink to 20 and desync page boundaries. This is inherent to a
stateless tool call (SendGrid requires page_size on every request,
and the tool has no way to remember the prior call's value), so
clarify via param description and UI placeholder that callers must
repeat the same pageSize across paginated calls.

Author: waleedlatif1

apps/sim/blocks/blocks/sendgrid.ts

@@ -447,7 +447,7 @@ Return ONLY the JSON array.`,
       id: 'templatePageToken',
       title: 'Page Token',
       type: 'short-input',
-      placeholder: 'Page token from a previous response',
+      placeholder: 'Page token from a previous response (keep Page Size the same)',
       condition: { field: 'operation', value: 'list_templates' },
       mode: 'advanced',
     },

apps/sim/tools/sendgrid/list_templates.ts

@@ -24,7 +24,10 @@ export const sendGridListTemplatesTool: ToolConfig<ListTemplatesParams, Template
       type: 'number',
       required: false,
       visibility: 'user-or-llm',
-      description: 'Number of templates to return per page (default: 20, max: 200)',
+      description:
+        'Number of templates to return per page (default: 20, max: 200). ' +
+        'When paginating with pageToken, pass the same pageSize used on the first request ' +
+        'to keep page boundaries consistent.',
     },
     pageToken: {
       type: 'string',