fix(candlestick): support cursor option

[diysimon]

close #21551

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fixes the missing cursor support on candlestick series and adds a manual test page for verification.

Fixed issues

• [Bug] 从5.5版本升级到 6.0, 可拖动区域鼠标自动变成手形, 如何改回默认或十字光标 #21551: cursor does not take effect on candlestick series

Details

Before: What was the problem?

cursor is a supported option on some series types, but it did not work on candlestick.

The main reason was that candlestick view did not forward the cursor option to zrender elements:

• in normal mode, the candlestick path did not read itemModel.getShallow('cursor')
• in large mode, the large candlestick paths did not apply series.cursor

As a result, hovering candlestick elements still showed the default cursor.

After: How does it behave after the fixing?

After this change:

• series.cursor works on candlestick in normal mode
• data[i].cursor also works in normal mode
• series.cursor works on candlestick in large mode

The fix is kept minimal by only wiring the existing cursor option through CandlestickView and adding a manual test page:

• test/candlestick-cursor.html

The test page includes:

• a normal-mode candlestick chart similar to the candlestick-sh example
• a large-mode candlestick chart for verifying the large rendering path

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

• test/candlestick-cursor.html

Merging options

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

Other information

Local verification:

• eslint
• tsc --noEmit
• manual verification in test/candlestick-cursor.html

[echarts-bot]

Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

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Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.