doc(Footer): update footer style

[ArgoZhang]

update footer style

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 #4732

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

Update the footer style for improved visual consistency and readability, and refactor the IP masking logic for better clarity and maintainability.

Enhancements:

• Refactor IP masking logic to use string splitting and joining instead of substring replacement.

Documentation:

• Update footer style to improve visual consistency and readability.

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR updates the footer styling by modernizing the color scheme using CSS variables, improving the layout of the .NET Foundation section, and optimizing the IP masking logic. The changes primarily focus on making the footer more maintainable and consistent with the application's theme.

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

File-Level Changes

Change	Details	Files
Modernized footer styling using CSS variables and improved visual consistency	Replaced hardcoded colors with CSS variables for better theme support Updated hover effects for footer links Adjusted padding and layout for better responsiveness Modified footer background and text colors for improved contrast	src/BootstrapBlazor.Server/Components/Layout/HomeLayout.razor.css
Relocated and improved .NET Foundation section layout	Moved .NET Foundation section from Index page to footer Improved foundation section styling with flexbox layout Added responsive design adjustments for foundation section	src/BootstrapBlazor.Server/Components/Layout/HomeLayout.razor src/BootstrapBlazor.Server/Components/Pages/Index.razor src/BootstrapBlazor.Server/Components/Pages/Index.razor.css
Optimized IP masking implementation	Replaced string manipulation with split-join approach Simplified logic for masking the last IP segment	src/BootstrapBlazor.Server/Extensions/IpExtensions.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4732	Update footer style and appearance	✅
#4732	Add sample code documentation for Footer component	❌	While the PR updates the footer styling, it does not add any sample code or documentation for the Footer component as requested in the issue

Possibly linked issues

• doc(Footer): update footer style #4732: The PR updates the footer style, directly addressing the issue's requirement.

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[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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (195c0ab) to head (9a08d1b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4733   +/-   ##
=========================================
  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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