feat(Layout): update style for IsFixedTabHeader

[ArgoZhang]

update style for IsFixedTabHeader

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #4730

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

Enhancements:

• Update the style for the IsFixedTabHeader component to improve layout behavior.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the styling of fixed tab headers in the Layout component by replacing the previous margin and height calculation approach with a sticky positioning solution. The changes simplify the CSS structure while maintaining the fixed header functionality.

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

File-Level Changes

Change	Details	Files
Simplified tab border card styling by removing unnecessary properties	Removed negative margin adjustment Removed border and border-radius properties Removed min-height calculation	src/BootstrapBlazor/Components/Layout/Layout.razor.scss
Replaced fixed tab header implementation with sticky positioning	Removed complex height calculations for layout-main Removed overflow and height settings for tabs-body Added sticky positioning for tabs-header Added z-index to ensure proper stacking context Removed footer height variable adjustment	src/BootstrapBlazor/Components/Layout/Layout.razor.scss

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4730	Update the tabs-header style with position: sticky, top: var(--bb-layout-header-height), and z-index: 5	✅

Possibly linked issues

• feat(Layout): update style for IsFixedTabHeader #4730: The PR implements the style changes for IsFixedTabHeader as described in the issue.

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[sourcery-ai]

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

Overall Comments:

• Please properly fill out the PR template, including risk assessment and verification details. This helps reviewers understand the impact of the changes.
• Consider adding before/after screenshots to demonstrate the visual impact of these layout changes, particularly how the new sticky header behavior differs from the previous implementation.
• The removal of margin, border, and height calculations represents a significant change. Please document how this might affect existing implementations and any migration steps if needed.

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 (333dd4d) to head (00ef1db).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4731   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          620       620           
  Lines        27391     27391           
  Branches      3921      3921           
=========================================
  Hits         27391     27391           

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

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