feat(Chart): add ShowTotalDataLabel parameter

[ArgoZhang]

Link issues

fixes #1061

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

Add support for showing total data labels on stacked charts.

New Features:

• Introduce a ShowTotalDataLabel option in ChartOptions to control display of total labels on stacked bar chart columns.

Enhancements:

• Refactor chart datalabel configuration to reuse a shared datalabels object and extend it with total label behavior when enabled.

[sourcery-ai]

Reviewer's Guide

Adds a ShowTotalDataLabel option to chart configuration and wires it into the JavaScript chart options to display total stacked values as data labels on bar tops when enabled.

File-Level Changes

Change	Details	Files
Introduce a reusable datalabels configuration object in the chart JS options and extend it to support total labels for stacked charts when ShowTotalDataLabel is enabled.	Create a datalabels object that centralizes anchor, align, formatter, display, color, and font settings instead of inlining them in the options block. Add logic that, when total data labels are enabled and the X axis is stacked, computes the last visible dataset index and configures additional labels.value and labels.total entries. Implement a total label formatter that sums visible dataset values for the current data index and only displays on the last visible dataset in the stack. Wire the datalabels object into the chart options configuration by replacing the previous inline datalabels definition.	src/components/BootstrapBlazor.Chart/Components/Chart/Chart.razor.js
Expose a ShowTotalDataLabel configuration flag in the ChartOptions C# model to control total data label visibility in stacked mode.	Add a ShowTotalDataLabel boolean property with XML documentation describing its use for stacked bar total labels and default behavior.	src/components/BootstrapBlazor.Chart/Components/Chart/ChartOptions.cs
Update the chart project file to reflect the feature addition (likely versioning or packaging metadata).	Modify the chart project file, presumably to bump version or adjust metadata to accommodate the new option.	src/components/BootstrapBlazor.Chart/BootstrapBlazor.Chart.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1061	Add a ShowTotalDataLabel parameter to the chart options and implement its behavior so that, when enabled in stacked mode, total data labels are shown at the top of each stacked bar.	✅

Possibly linked issues

• feat(Chart): add ShowTotalDataLabel parameter #1061: The PR adds the ShowTotalDataLabel property and stacked total label rendering exactly as requested.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've left some high level feedback:

• The showTotalDataLabel logic currently only checks option.options.x.stacked; if horizontal stacked charts are supported, consider also handling y.stacked for consistent behavior.
• The lastVisibleIndex helper is recreated and run on each label evaluation; consider extracting it or caching the last visible index per render cycle to avoid repeated iteration over all datasets.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `showTotalDataLabel` logic currently only checks `option.options.x.stacked`; if horizontal stacked charts are supported, consider also handling `y.stacked` for consistent behavior.
- The `lastVisibleIndex` helper is recreated and run on each label evaluation; consider extracting it or caching the last visible index per render cycle to avoid repeated iteration over all datasets.

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