fix(candlestick/boxplot): resolve base axis correctly when series uses xAxisId/yAxisId

[waterWang]

fix #21725

Problem

getInitialData() and getBaseAxis() in WhiskerBoxCommonMixin (used by candlestick and boxplot series) were hardcoded to use ecModel.getComponent(mainType, this.get('xAxisIndex')). When a series specifies xAxisId/yAxisId instead of xAxisIndex/yAxisIndex, this.get('xAxisIndex') returns undefined, causing ecModel.getComponent to fall back to the first axis component. This leads to incorrect axis resolution in multi-grid layouts.

Fix

Replace ecModel.getComponent with this.getReferringComponents(mainType, SINGLE_REFERRING) which properly handles both xAxisIndex/xAxisId (and yAxisIndex/yAxisId). Falls back to the first axis when neither is specified, preserving backward compatibility.

Test

New unit test whiskerBoxCommon.test.ts:

• Verifies that each series in a multi-grid config gets the correct base axis when using xAxisId
• Verifies backward compatibility (no index/id → first axis)

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[Copilot]

Pull request overview

Fixes axis resolution for candlestick and boxplot series using axis IDs.

Changes:

• Uses getReferringComponents for ID- and index-based axis lookup.
• Adds regression and fallback tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/chart/helper/whiskerBoxCommon.ts	Corrects referenced-axis resolution.
test/ut/spec/series/whiskerBoxCommon.test.ts	Adds axis-ID and default-axis tests.

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