fix(charts): fix LineChart left_axis labels display incomplete #6445

[KangZhaoKui]

Fixes #6445

Description

The bug was caused by floating-point precision errors in the axis label layout calculation.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Summary by Sourcery

Bug Fixes:

• Ensure axis label selection uses a tolerance-based comparison to avoid missing labels due to floating-point precision errors.

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[FeodorFitsner]

Thank you so much for the report and the fix, @KangZhaoKui! You correctly diagnosed the root cause — float comparison with == on values like 0.1, 0.2, 0.3 fails due to IEEE 754 representation.

I've opened #6459 against the release/v0.85.0 branch with a slight variation: the tolerance is scaled by meta.appliedInterval so it adapts to the chart's value range (instead of a hardcoded 0.001, which would be too coarse for very small ranges and unnecessarily tight for very large ones). Closing this in favor of #6459 — credit to you in the changelog. Really appreciate the contribution! 🙏