doc(Dialog): add docment for ShowModal dialog service

[ArgoZhang]

add docment for ShowModal dialog service

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 #4747

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

Add documentation for the ShowModal dialog service and update a unit test to ensure correct behavior of the DateTimePicker component.

Documentation:

• Add documentation for the ShowModal dialog service.

Tests:

• Modify the DateTimePickerTest to assert that the value is not equal to DateTime.MinValue after clicking a button.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates a unit test for the DateTimePicker component's AutoClose functionality. The test case has been modified to correctly verify that selecting a date updates the value when AutoClose is enabled.

Class diagram for DateTimePickerTest modifications

classDiagram
    class DateTimePickerTest {
        +AutoClose_OK()
    }
    note for DateTimePickerTest "Modified the AutoClose_OK test to correctly verify date selection."

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File-Level Changes

Change	Details	Files
Fixed DateTimePicker AutoClose unit test logic	Added explicit date cell selection before click event Updated assertion to verify value is set after date selection Changed assertion from Equal to NotEqual when comparing with DateTime.MinValue	test/UnitTest/Components/DateTimePickerTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4747	Add documentation/sample code for ShowModal dialog service	❌	The PR only contains changes to a DateTimePicker test file and does not include any documentation or sample code for the ShowModal dialog service as requested in the issue.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (725ee30) to head (f2b8699).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4748   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          620       620           
  Lines        27390     27390           
  Branches      3921      3921           
=========================================
  Hits         27390     27390           

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