feat(Dropdown): update Color default value

[ArgoZhang]

Link issues

fixes #6591

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

Update Dropdown component to use a primary button style by default by changing the default Color value to Primary and adjusting the CSS builder logic

Bug Fixes:

• Remove conditional btn-primary class fallback and apply primary styling by default for Dropdown button

Enhancements:

• Set default Dropdown component Color parameter to Primary instead of None

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the Dropdown component to use Color.Primary as its default and revises the CSS class builder by removing the fallback logic for Color.None.

File-Level Changes

Change	Details	Files
Default color changed from None to Primary with CSS logic updated	Set Color parameter default to Color.Primary Removed AddClass fallback for btn-primary when Color was None Updated XML doc comment to reflect new default value	src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6591	Update the default value of the Color property in the Dropdown component.	✅

Possibly linked issues

• feat(Dropdown): update Color default value #6591: The PR changes Dropdown Color default from None to Primary, addressing the issue.

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[sourcery-ai]

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

• Add an entry in the CHANGELOG to document the breaking change of Dropdown’s default color from None to Primary.
• Update any demo pages or examples to reflect the new default Primary color behavior in Dropdown components.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Add an entry in the CHANGELOG to document the breaking change of Dropdown’s default color from None to Primary.
- Update any demo pages or examples to reflect the new default Primary color behavior in Dropdown components.

## Individual Comments

### Comment 1
<location> `src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs:70` </location>
<code_context>
         .Build();

     /// <summary>
-    /// 获得/设置 颜色 默认 Color.None 无设置
+    /// 获得/设置 颜色 默认 Color.Primary 无设置
     /// </summary>
     [Parameter]
</code_context>

<issue_to_address>
The summary comment update should clarify that Color.Primary is now the default.

The phrase '无设置' may cause confusion, as a default is now always present. Please reword to clarify that Color.Primary is used unless overridden.
</issue_to_address>

<suggested_fix>
<<<<<<< SEARCH
    /// <summary>
    /// 获得/设置 颜色 默认 Color.Primary 无设置
    /// </summary>
=======
    /// <summary>
    /// 获得/设置 颜色。默认值为 Color.Primary，除非被显式设置为其他值。
    /// </summary>
>>>>>>> REPLACE

</suggested_fix>

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