Fix trend cursor follow under auto-resize scaling

[robke96]

📌 Description

Please describe the changes introduced by this Pull Request.

• What problem does this solve?

  • [BUG] Trend Follow does not Scale Properly #2250
  • It fixes the trend cursor/follow being inaccurate when Auto-resize scaling is enabled.

• What was changed?

  • Mouse coordinates are now converted from the scaled screen position back to the chart’s real internal position before the trend uses them.

• Why is this needed?

For documentation-only PRs, focus on the Documentation checklist.

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🧪 Type of Change

Please mark the relevant option:

• Bug fix
• New feature
• Refactoring
• Documentation
• Other

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🚫 Build Artifacts Check

Please confirm:

• I did NOT commit /client/dist
• I did NOT commit generated Angular build output
• Only source files are included

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🔍 Checklist

• Code follows project coding standards
• I tested my changes locally
• Documentation updated if required
• Issue opened (for major changes)

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📚 Documentation Checklist (if applicable)

• The documentation builds locally with mkdocs serve
• All links were tested
• Images use relative paths (e.g. images/example.png)
• No references to the old GitHub Wiki
• Navigation updated in mkdocs.yml (if required)

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📝 Additional Notes

fixed.mp4