fix(custom): preserve cursor for renderItem elements on hover

[Ishita06-ai]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fixed issues

Details

Before: What was the problem?

After: How does it behave after the fixing?

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Merging options

• Please squash the commits into a single one when merging.

Other information

description:
When using renderItem with cursor specified, the cursor is lost on hover because the emphasis state does not inherit cursor from the normal state. This PR copies the cursor value to the emphasis state during incremental rendering.

Closes #21498

[echarts-bot]

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