Node Search: prioritize frequently used and recently used nodes

## Summary

User feedback from Typeform survey suggests that Node Search should learn from usage patterns to surface more relevant results.

## Feature Request

1. **Frequency-based sorting** — Nodes the user uses most often should appear higher in search results
2. **Connection pattern learning** — When connecting from a specific output type, suggest nodes that are frequently connected to that output (e.g., Image output → Resize node)
3. **Recent usage priority** — Recently used nodes matching the search query should appear first

## Context

- From Typeform "Node Search" survey response (2026-03-27)
- User rated search ease 5/5 and overall 4/5, so current search works well — this is an enhancement
- Slack thread: https://comfy-organization.slack.com/archives/C0ALLT6Q3SQ/p1774621746364889

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-10669-Node-Search-prioritize-frequently-used-and-recently-used-nodes-3316d73d36508192bbebc3c7754b670f) by [Unito](https://www.unito.io)