doc(Chart): add center sample code

[ArgoZhang]

Link issues

fixes #8191

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

Demonstrate stacked bar chart data labels anchored at both the end and center within the sample page.

New Features:

• Add a stacked bar chart sample showcasing data labels anchored at the center alongside the existing end-anchored variant.

Enhancements:

• Update the stacked data label demo layout to display two side-by-side charts with adjusted dimensions for better comparison of label anchoring.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Bar chart demo to showcase data label anchoring (center vs end) and wires the sample to a parameterized initialization method, along with corresponding localization entries.

Sequence diagram for Bar chart stacked data label center vs end demo

sequenceDiagram
    actor User
    participant BarComponent
    participant Chart_end
    participant Chart_center
    participant OnInitStackedShowDataLabel

    User->>BarComponent: navigate BarStackedShowDataLabel demo
    BarComponent->>Chart_end: render Chart ChartType.Bar
    BarComponent->>Chart_center: render Chart ChartType.Bar

    Chart_end->>OnInitStackedShowDataLabel: OnInitStackedShowDataLabel(false)
    OnInitStackedShowDataLabel-->>Chart_end: ChartDataSource (Title Anchor_End)

    Chart_center->>OnInitStackedShowDataLabel: OnInitStackedShowDataLabel(true)
    OnInitStackedShowDataLabel-->>Chart_center: ChartDataSource (Title Anchor_Center, Anchor=Center)

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File-Level Changes

Change	Details	Files
Update stacked bar chart demo layout to show two side-by-side charts comparing different data label anchors.	Replace single Chart instance with a Bootstrap row containing two responsive columns. Instantiate two Chart components configured with different OnInitAsync lambdas, each targeting a different anchor setting. Adjust chart dimensions to fit side-by-side layout in the demo block.	src/BootstrapBlazor.Server/Components/Samples/Charts/Bar.razor
Extend stacked bar chart initialization logic to support configurable data label anchoring and titles.	Change OnInitStackedShowDataLabel to accept a boolean parameter indicating whether to use center anchoring. Set chart title dynamically based on the anchor mode (center vs end). Conditionally assign ChartDataLabelPosition.Center to Options.Anchor when center mode is enabled. Keep existing stacked axis and data label configuration while adding anchor support.	src/BootstrapBlazor.Server/Components/Samples/Charts/Bar.razor.cs
Add or update localization strings for the new/adjusted Bar chart demo text related to data label anchoring.	Introduce or modify English locale entries to describe the center vs end data label anchor sample. Introduce or modify Chinese locale entries to match the new demo wording. Ensure localization keys align with usage in the Bar chart demo components.	src/BootstrapBlazor.Server/Locales/en-US.json src/BootstrapBlazor.Server/Locales/zh-CN.json

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8191	Implement support for displaying each stacked bar segment's value centered within the segment (e.g., via a ChartOptions.Anchor = Center-style configuration) in the chart component itself.	❌	The PR only updates the sample Bar chart demo to show two charts, one with Anchor: Center and one with Anchor: End, by adding a center parameter to the demo's OnInitStackedShowDataLabel method and setting ds.Options.Anchor = ChartDataLabelPosition.Center when center is true. It does not introduce or modify any core chart component behavior or configuration options; it assumes the centering capability already exists.
#8191	Provide an optional parameter or configuration to control whether bar segment values are shown or not (i.e., toggle data label visibility) as part of the feature.	❌	The PR relies on the existing ds.Options.ShowDataLabel = true setting in the demo code and does not add a new optional parameter or API to control label visibility. It only adjusts how the existing labels are anchored in the demo, without adding a toggle mechanism at the component or options level.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider replacing the bool center parameter on OnInitStackedShowDataLabel with a more descriptive enum or using ChartDataLabelPosition directly to avoid ambiguous boolean flags and make the intent clearer at call sites.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider replacing the `bool center` parameter on `OnInitStackedShowDataLabel` with a more descriptive enum or using `ChartDataLabelPosition` directly to avoid ambiguous boolean flags and make the intent clearer at call sites.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d661903) to head (3356a7b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8219   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          769       769           
  Lines        34427     34427           
=========================================
  Hits         34427     34427           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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