feat(CheckboxList): add outline style

[ArgoZhang]

Link issues

fixes #6537

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

Apply outline style to CheckboxList items by using btn-outline-{color} classes and adjust CSS variables for disabled and info outline variants; update sample to demonstrate label and display text

New Features:

• Enable outline style for CheckboxList buttons by using btn-outline-{color} classes instead of solid fills

Enhancements:

• Remove default solid border from the button group and configure CSS variables for hover/active colors in disabled and info outline states
• Update sample usage of CheckboxList to include ShowLabel and DisplayText parameters

[sourcery-ai]

Reviewer's Guide

Introduce an outline variant for CheckboxList buttons by updating SCSS styles, refactoring CSS class generation, adjusting component markup, and enhancing the sample to demonstrate the new style.

File-Level Changes

Change	Details	Files
Apply outline button style in SCSS	Removed default solid border from .btn-group Added CSS variable overrides for disabled state Defined .btn-outline-info active text color	src/BootstrapBlazor/Components/Checkbox/CheckboxList.razor.scss
Refactor button class builder to include outline variant	Always add 'btn-outline-{color}' class Separate 'active' class assignment	src/BootstrapBlazor/Components/Checkbox/CheckboxList.razor.cs
Adjust Razor markup formatting	Split DynamicElement attributes onto separate lines for readability	src/BootstrapBlazor/Components/Checkbox/CheckboxList.razor
Update sample usage to showcase new style	Enabled ShowLabel property Added DisplayText="Hobby"	src/BootstrapBlazor.Server/Components/Samples/CheckboxLists.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6537	Add an outline style to the CheckboxList component.	✅

Possibly linked issues

• feat(CheckboxList): add outline style #6537: The PR implements the outline style for CheckboxList as requested in the issue by modifying CSS and adding outline button classes.

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[sourcery-ai]

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

• There’s a stray BOM/non-printable character at the top of CheckboxList.razor.scss—remove it to avoid encoding/build issues.
• Currently the SCSS only defines .btn-outline-info; consider generating the outline style for all btn-outline-{color} variants (e.g. via Bootstrap mixins) instead of hard-coding info.
• The sample update adds ShowLabel/DisplayText props but this PR doesn’t include their implementation in CheckboxList—either implement support for those props or remove them from the sample.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- There’s a stray BOM/non-printable character at the top of CheckboxList.razor.scss—remove it to avoid encoding/build issues.
- Currently the SCSS only defines `.btn-outline-info`; consider generating the outline style for all `btn-outline-{color}` variants (e.g. via Bootstrap mixins) instead of hard-coding info.
- The sample update adds ShowLabel/DisplayText props but this PR doesn’t include their implementation in CheckboxList—either implement support for those props or remove them from the sample.

## Individual Comments

### Comment 1
<location> `src/BootstrapBlazor/Components/Checkbox/CheckboxList.razor.scss:66` </location>
<code_context>
             }
         }
+
+        .btn-outline-info {
+            --bs-btn-active-color: #fff;
+        }
     }
</code_context>

<issue_to_address>
Hardcoding active color for .btn-outline-info may reduce theme flexibility.

Consider parameterizing --bs-btn-active-color or using a more generic approach to maintain compatibility with different themes and future color variants.

Suggested implementation:

```
        .btn-outline-info {
            --bs-btn-active-color: var(--bs-btn-info-active-color, #fff);
        }

```

To fully support this, you should define `--bs-btn-info-active-color` in your global theme or root CSS, so it can be easily customized for different themes. For example, in your root CSS or theme file:

:root {
  --bs-btn-info-active-color: #fff; // or your preferred default
}

This allows you to change the active color for `.btn-outline-info` in one place, maintaining theme flexibility.
</issue_to_address>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (184b491) to head (efdde83).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6538   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          714       714           
  Lines        31395     31396    +1     
  Branches      4432      4432           
=========================================
+ Hits         31395     31396    +1     

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

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