fix(axis): respect custom axis tick interval. close #17967

[rahul37wallst-sudo]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fix category axis ticks so axisTick.interval callback results are respected exactly.

Fixed issues

• Wrong interval in axisTick when use method  #17967: Category axis ticks added boundary ticks even when a custom axisTick.interval callback did not select them.

Details

Before: What was the problem?

When xAxis.axisTick.interval was a callback on a category axis, ECharts still kept extent-boundary ticks internally.

That caused two incorrect cases:

• if the callback matched only one category, an extra tick appeared before the first bar;
• if the callback matched multiple categories, an extra tick appeared after the last bar.

After: How does it behave after the fixing?

Function-based axisTick.interval now keeps ticks strictly according to the callback result.

The min/max boundary preservation remains for axis labels, where the existing label display strategy needs it, but custom axis tick callbacks no longer receive forced boundary ticks.

Validation:

npx jest --config test/ut/jest.config.cjs --coverage=false --runInBand --runTestsByPath test/ut/spec/scale/interval.test.ts
npm run checktype
npm run lint
git --no-pager diff --check

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

Added regression coverage in test/ut/spec/scale/interval.test.ts.

Merging options

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

Other information

N.A.

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