fix(DateTimePicker): width overflow when set ViewMode to DateTime

[ArgoZhang]

Link issues

fixes #6589

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

Bug Fixes:

• Prevent header width overflow in DateTimePicker when ViewMode is DateTime by adding a dedicated CSS class and reducing the header label font size

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR resolves width overflow in DateTime view by introducing a dedicated header-bar class injected via C# logic and accompanying CSS tweaks to reduce the header label font size.

Class diagram for updated DatePickerBody header label logic

classDiagram
    class DatePickerBody {
        - bool IsDateTimeMode
        + string? HeaderLabelString
    }
    DatePickerBody : HeaderLabelString
    DatePickerBody : IsDateTimeMode

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File-Level Changes

Change	Details	Files
Implement conditional header-bar class injection for DateTime mode	Add HeaderLabelString property using CssBuilder to toggle 'picker-panel-header-bar' Replace static class attribute on header div with HeaderLabelString Apply 'picker-panel-header-bar' when ViewMode is DateTime	src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor.cs src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor
Adjust header label styling to prevent overflow	Add CSS rule to set .picker-panel-header-bar .picker-panel-header-label font-size to 14px	src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor.scss

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6589	Fix the width overflow issue in DateTimePicker when time selection is enabled (ViewMode is DateTime).	✅

Possibly linked issues

• bug(DateTimePicker): 修复 DateTimePicker 开启时间时宽度溢出问题 #6589: The PR fixes the DateTimePicker width overflow by adjusting CSS and layout, directly addressing the issue's described bug.

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[sourcery-ai]

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

Prompt for AI Agents

Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor.scss:65` </location>
<code_context>
                     }
                 }

+                .picker-panel-header-bar {
+                    .picker-panel-header-label {
+                        font-size: 14px;
+                    }
+                }
</code_context>

<issue_to_address>
Check for style conflicts between .picker-panel-header-label font-size definitions.

There are conflicting font-size values (14px and 16px) for .picker-panel-header-label. Please confirm which value should take precedence to avoid inconsistent styling.
</issue_to_address>

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