feat(Chart): support custome BackgroundColor

[ArgoZhang]

Link issues

fixes #7348

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Enhancements:

• Reformat bar chart dataset initialization for improved readability in the server sample.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refactors the Bar chart sample dataset initialization for clarity and consistency without changing behavior, and removes the BOM marker from the file header comment.

File-Level Changes

Change	Details	Files
Refactor bar chart sample dataset construction for readability without altering behavior.	Expand inline ChartDataset object initialization into multi-line object initializer with explicit properties Preserve existing label generation and random data generation logic for chart data source Keep method signature and return behavior of OnInit unchanged	src/BootstrapBlazor.Server/Components/Samples/Charts/Bar.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7348	Enable ChartDataset.BackgroundColor to control the legend rectangle fill color and the line color for line charts.	❌	The PR only reformats the Bar chart sample code and does not change any chart rendering logic or how BackgroundColor is used for line charts.
#7348	Enable ChartDataset.BorderColor to optionally draw a border around the legend rectangle and the drawn line for line charts (null by default).	❌	There are no changes in the PR touching BorderColor or line chart rendering; BorderColor behavior remains unchanged.
#7348	Generalize color customization support (BackgroundColor and BorderColor) so it works for all relevant chart types, not just bar charts.	❌	The PR modifies only a Bar chart sample dataset construction and does not introduce any new color customization support across chart types.

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The PR title and linked issue suggest adding support for custom chart background color, but the diff only shows minor formatting changes; either the implementation is missing or the title/issue reference should be updated for clarity.
• The license header change removed the BOM/leading character on the first line; double-check this was intentional and aligns with the repository’s encoding conventions for source files.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The PR title and linked issue suggest adding support for custom chart background color, but the diff only shows minor formatting changes; either the implementation is missing or the title/issue reference should be updated for clarity.
- The license header change removed the BOM/leading character on the first line; double-check this was intentional and aligns with the repository’s encoding conventions for source files.

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The merge-base changed after approval.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (264b9d6) to head (a0325ee).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7352   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          747       747           
  Lines        32760     32760           
  Branches      4540      4540           
=========================================
  Hits         32760     32760           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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[Copilot]

Pull request overview

This PR adds support for custom BackgroundColor in the Chart component by upgrading the BootstrapBlazor.Chart package to version 10.0.1-beta02.

Note: The PR title contains a spelling error: "custome" should be "custom".

Key Changes

• Updated BootstrapBlazor.Chart package from version 10.0.0 to 10.0.1-beta02
• Minor code formatting improvements in Bar.razor.cs for better readability

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj	Updated BootstrapBlazor.Chart package version to 10.0.1-beta02 to enable custom BackgroundColor support
src/BootstrapBlazor.Server/Components/Samples/Charts/Bar.razor.cs	Reformatted ChartDataset initialization for improved code readability (multi-line format)

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