fix(toolbox): fix toolbox text can't apply the specified or global font style

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Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fix the bug that the toolbox text neither applies the specified font style nor inherits from the global font style

Fixed issues

N.A.

Details

Before: What was the problem?

The toolbox text doesn't apply the custom fonts. Demo

After: How does it behave after the fixing?

Demo

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

ZRender Changes

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

Related test cases or examples to use the new APIs

Please refer to the second test case in test/toolbox-textStyle.html

Others

Merging options

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

Other information

It would be better to use label#createTextStyle to support more text style and extract the textStyle option from the current iconStyle in the future.

[echarts-bot]

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[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19170@0508353

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍