InfoPanel node previews: no pagination, fetches 8192 items at once

## Recommendation

### 🔧 FINISH: Add pagination for node preview rendering

Currently fetches up to 8192 nodes in a single request with no pagination.

## What Was Found

- `src/workbench/extensions/manager/components/manager/infoPanel/InfoPanelMultiItem.vue:193` — `// TODO: Render all nodes previews and handle pagination.` — Uses `limit: 8192`.

## Context

Large node packs could cause performance issues loading all previews at once.

---

**Category:** Half-Implemented | **Confidence:** MEDIUM | **Tools:** Semantic analysis
_Filed by audit-code skill_

Part of #11022

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-11034-InfoPanel-node-previews-no-pagination-fetches-8192-items-at-once-33e6d73d36508101992bd72affa6a017) by [Unito](https://www.unito.io)