feat(Calendar): add HeaderTemplate parameter

[densen2014]

add AdditionalHeaders parameter

Summary of the changes (Less than 80 chars)

周视图添加附加列

Description

fixes #5102

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

[Justify the selection above]

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

New Features:

• Introduce an AdditionalHeaders parameter to the Calendar component, allowing users to add custom headers in the week view.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds support for additional header columns in the Calendar component's week view. The implementation adds a new AdditionalHeaders parameter that accepts an array of strings, which are rendered as extra columns before the weekday headers.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added support for additional header columns in the Calendar week view	Added new AdditionalHeaders parameter of type string[] Created RenderAddHeader RenderFragment to display additional header columns Modified week view table header to conditionally render additional columns Additional headers are displayed with responsive behavior (hidden on small screens)	src/BootstrapBlazor/Components/Calendar/Calendar.razor src/BootstrapBlazor/Components/Calendar/Calendar.razor.cs

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[bb-auto]

Thanks for your PR, @densen2014. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Hey @densen2014 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Please provide documentation for the new AdditionalHeaders parameter and include a demo showing its usage.
• The PR checklist is incomplete - please review and check all relevant items, particularly regarding documentation and demo requirements.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6f491d7) to head (4c978c5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4674   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          633       634    +1     
  Lines        28136     28159   +23     
  Branches      4036      4039    +3     
=========================================
+ Hits         28136     28159   +23     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ice6]

@densen2014 it should be a good feature to have, can you solve the conflicts and re-pull-request again?