1017886: Add color range topic in core and mvc heatmap palette.

[smukilansf3478]

Bug description

The Core and MVC Heatmap palette documentation is missing details about the color range feature.

Root cause

The color range section was not included in the Core nad MVC Heatmap user guide.

Solution description

The color range content has now been added to the Core and MVC Heatmap documentation.

Code Studio usage(Mandatory)

• Code Studio used in this PR/MR?

  • Yes
  • No

• If Yes: Primary use (choose one)

  • Generate new code
  • [] Refactor/improve existing code
  • Tests
  • Bug fix / debugging help
  • Docs / comments
  • Review assistance (explanations/summaries)
  • Other:

• Outcome

  • Saved time
  • Neutral
  • Cost time

• If “Cost time” explain in short (1 or 2 lines): I manually moved the hotfix changes into the development branch, so I did not use the AI for this update.
  All modifications were made directly based on the existing code to ensure accuracy.

Impact assessment

• Low - Affects a single feature with minimal user impact
• Medium - Affects multiple features or has moderate user impact
• High - Critical functionality or significant user impact

Reason for not identifying earlier

Provide the reason for not identifying the bug earlier.

Areas tested against this fix

• Tested using standard test cases
• Tested against feature matrix. Centralized location
• NA

Breaking changes

• Yes (Tag breaking-issue)
• No

If yes, provide breaking commit details link and migration guidance.

Regression testing

• Verified fix doesn't reintroduce previous bugs
• Checked edge cases and error scenarios

Action taken to prevent recurrence

• Added/updated unit tests
• Other (specify): _________________
• NA

Automation status

• BUnit (provide PR link: _________________)
• Playwight (provide PR link: _________________)
• NA

Cross-platform verification

• Blazor Server
• Blazor WASM
• NA

Related issues

Is this issue present in EJ2 or other components?

• Resolved in EJ2 (PR link: _________________)
• Created task for EJ2 (Task link: _________________)
• Needs attention in other components (tag needs-attention-coreteam)
• NA

Output screenshots

Post the output screenshots if a UI is affected or added due to this bug.

API changes

• New API added (API Review task link: _________________)
• Existing API renamed/modified (API Review task link: _________________)
• No API changes

Performance verification

• Verified no memory leaks introduced
• Verified no performance degradation
• Not applicable

Reviewer Checklist

• Reviewed the provided Code Studio usages related information.
• Code changes follow component guidelines
• All provided information reviewed and verified
• Solution addresses the root cause effectively