feat(Card): support custom class for header

[Tony-ST0754]

Link issues

fixes #8197

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

Allow Card component sections to accept custom attributes for header, body, and footer containers.

New Features:

• Add HeaderAttributes parameter to customize attributes on the card header element.
• Add BodyAttributes parameter to customize attributes on the card body container element.
• Add FooterAttributes parameter to customize attributes on the card footer container element.

[bb-auto]

Thanks for your PR, @Tony-ST0754. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's Guide

Adds support for custom attribute dictionaries on Card header, body, and footer sections and wires them into the corresponding markup, allowing consumers to apply arbitrary HTML attributes to those elements.

File-Level Changes

Change	Details	Files
Expose new parameter dictionaries for header, body, and footer attributes on the Card component and prevent them from being serialized.	Add using directive for System.Text.Json.Serialization to enable JsonIgnore usage. Introduce HeaderAttributes, BodyAttributes, and FooterAttributes as nullable IDictionary<string, object>? parameters, each annotated with [Parameter] and [JsonIgnore].	src/BootstrapBlazor/Components/Card/Card.razor.cs
Apply the new attribute dictionaries to the header, body, and footer elements in the Card markup.	Attach @HeaderAttributes to the header div with class "card-header" so callers can provide arbitrary attributes. Attach @BodyAttributes to the main body div identified by BodyId and BodyClassName. Attach @FooterAttributes to the footer div rendered when FooterTemplate is provided.	src/BootstrapBlazor/Components/Card/Card.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8197	Expose a way to customize the Card header section (e.g., class/style/attributes) so users can independently control its background and other visual properties.	✅
#8197	Provide similar customization capabilities for the Card body and footer sections so their backgrounds and other styles can be independently controlled.	✅

Possibly linked issues

• feat(Card): support custom class for header #8197: They address the same need: customizing Card header/body/footer via new attribute dictionaries allowing custom classes/styles.
• feat(Card): support custom class for header #8197: PR新增Header/Body/FooterAttributes以允许为Card各部分设置自定义样式和背景，解决需求。

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.79%. Comparing base (7a7a47a) to head (57ab7eb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8199   +/-   ##
=======================================
  Coverage   98.78%   98.79%           
=======================================
  Files         767      767           
  Lines       34290    34298    +8     
  Branches     4715     4715           
=======================================
+ Hits        33875    33884    +9     
+ Partials      415      414    -1     

Flag	Coverage Δ
BB	98.79% <100.00%> (?)

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