refactor(Layout): adjust z-index value for Modal

[ArgoZhang]

adjust z-index value for Modal

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 #4685

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:

• Adjust z-index values for layout components to improve stacking order.

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR refactors the Layout component's z-index values and height calculations. It introduces CSS variables for height calculations, removes redundant CSS styles, and updates the layout structure to be more maintainable. The changes primarily focus on improving the stacking order of components and making the layout height calculations more flexible.

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

File-Level Changes

Change	Details	Files
Adjusted z-index values for layout components to improve stacking order	Reduced z-index value from 1090 to 1035 for fixed header Reduced z-index value from 1090 to 1035 for fixed footer	src/BootstrapBlazor/Components/Layout/Layout.razor.scss
Refactored height calculations using CSS variables	Added is-page class with 100vh height variable Updated layout-main height calculation to use CSS variables Changed fixed height values to use dynamic CSS variables Replaced hardcoded 100vh values with --bb-layout-height variable	src/BootstrapBlazor/Components/Layout/Layout.razor.scss
Cleaned up and simplified CSS styles	Removed redundant menu demo styles Simplified layout demo CSS variables Updated menu component structure and styling	src/BootstrapBlazor.Server/Components/Samples/Menus.razor.css src/BootstrapBlazor.Server/wwwroot/css/site.css src/BootstrapBlazor.Server/Components/Samples/Menus.razor
Updated layout component logic and tests	Modified IsPage handling in Layout component Updated unit tests for IsPage functionality Removed unused IsOpen property	src/BootstrapBlazor/Components/Layout/Layout.razor.cs test/UnitTest/Components/LayoutTest.cs src/BootstrapBlazor.Server/Components/Layout/PageLayout.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4685	Adjust z-index value for Modal component	✅

Possibly linked issues

• refactor(Layout): adjust z-index value for Modal #4685: The PR adjusts z-index values for layout components, addressing the issue's request for Modal z-index change.

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time. You can also use
  this command to specify where the summary should be inserted.

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

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

Overall Comments:

• The test coverage for Layout component was reduced by removing UseTabSet and IsFixedTabHeader checks. Please either restore these test cases or explain why they are no longer needed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 1 issue found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9a1b5cc) to head (3737b65).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4686   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          620       620           
  Lines        27388     27388           
  Branches      3929      3929           
=========================================
  Hits         27388     27388           

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

[ArgoZhang]

@sourcery-ai review

[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

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

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}