Add missing code from example 14 of BitDatePicker demo (#12285)

[zahra-yousefi]

closes #12285

Summary by CodeRabbit

• Documentation
  • Updated date picker component demo with an additional success message handling example.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: cc20bc74-b29b-4419-89bb-b0482382be78

📥 Commits

Reviewing files that changed from the base of the PR and between 5691d38 and 70f43dd.

📒 Files selected for processing (1)

• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/DatePicker/BitDatePickerDemo.razor.samples.cs

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Walkthrough

This change adds a missing SuccessMessage string field initialization to example 14 of the BitDatePicker demo page's C# code snippet, completing the sample code that was previously incomplete.

Changes

Cohort / File(s)	Summary
BitDatePicker Demo Code Snippet src/BlazorUI/Demo/Client/.../BitDatePickerDemo.razor.samples.cs	Added SuccessMessage string field initialization to example 14's C# code snippet, resolving missing field definition from sample code.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A field once lost in demo's code,
SuccessMessage, ready to unload,
Example fourteen now feels complete,
The missing piece makes samples sweet! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding missing code (SuccessMessage definition) to example 14 of the BitDatePicker demo.
Linked Issues check	✅ Passed	The pull request adds the missing SuccessMessage definition to example 14 of the BitDatePicker demo, directly addressing the requirement stated in issue #12285.
Out of Scope Changes check	✅ Passed	The change only adds the missing SuccessMessage field to the demo snippet as required by issue #12285; no unrelated or out-of-scope changes are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Pull request overview

Fixes the BitDatePicker demo’s Example 14 (“Validation”) sample code by adding the missing SuccessMessage field so the published C# snippet matches the actual demo logic and resolves issue #12285.

Changes:

• Added the missing SuccessMessage field to the Example 14 C# sample snippet.