fix(marker): use raw value without precision rounding when the mark line targets a specific axis value or is in min/max type

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

[Behavior Change]

1. Fix the mark line is not at the expected position due to precision rounding when it targets a specific axis value.
2. The mark line in min / max type is now also using the raw value without precision conversion.

For example:

{
  yAxis: 2.0156
}

Since precision defaults to 2, the mark line above is rounded to 2.02. So it appears in an unexpected position and even disappears when yAxis.min is 2.015.

Fixed issues

Fixes #21743

Comparison

Before	After

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/markLine-precision.html

Merging options

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

Other information

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[Copilot]

🟡 Changes recommended

Values requiring more than 20 decimal places are still rounded incorrectly.

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Pull request overview

Fixes mark-line positioning when explicit axis values exceed the default precision.

Changes:

• Derives precision from explicit axis values.
• Adds a browser regression case.

File summaries

File	Description
src/component/marker/MarkLineView.ts	Adjusts mark-line coordinate rounding.
test/markLine-precision.html	Demonstrates explicit-value precision behavior.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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[Copilot]

🟢 Approval recommended

The focused implementation matches the intended semantics and includes appropriate regression coverage.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Balanced