Add missing sample code to BitDropdown demo page (#12256)

[zahra-yousefi]

closes #12256

Summary by CodeRabbit

• New Features
  • Dropdown components now support dynamic item addition, enabling real-time updates to available options in combo dropdown examples.

[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: 7c0e6a24-9c08-4888-b9b1-b98329ab86cc

📥 Commits

Reviewing files that changed from the base of the PR and between 19f78b8 and 9bf893e.

📒 Files selected for processing (1)

• src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/_BitDropdownItemDemo.razor.samples.cs

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Walkthrough

Added the missing HandleOnDynamicAdd method to the Dynamic ComboBox sample code-behind file. This method accepts a BitDropdownItem<string> parameter and appends it to the comboBoxItems collection, enabling dynamic item addition in the dropdown example.

Changes

Cohort / File(s)	Summary
Dynamic ComboBox Handler src/BlazorUI/Demo/Client/Bit.BlazorUI.Demo.Client.Core/Pages/Components/Inputs/Dropdown/_BitDropdownItemDemo.razor.samples.cs	Added HandleOnDynamicAdd method that appends a BitDropdownItem<string> to the comboBoxItems collection for dynamic item management.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰✨ A method was lost, now found at last,
No more references to code that's past!
Dynamic items now dance and sway,
The ComboBox lives another day! 🎉

🚥 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 pull request title accurately summarizes the main change: adding missing sample code to the BitDropdown demo page, matching the file modifications and linked issue.
Linked Issues check	✅ Passed	The pull request successfully implements the HandleOnDynamicAdd method required by issue #12256, directly addressing the missing method implementation in the Dynamic ComboBox sample.
Out of Scope Changes check	✅ Passed	The changes are limited to adding the missing HandleOnDynamicAdd method implementation, which is directly within the scope of issue #12256 with no extraneous modifications.
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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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds the missing sample code required for the BitDropdown demo to demonstrate dynamically adding new dropdown items at runtime (per #12256).

Changes:

• Introduces a handler method that appends a newly created BitDropdownItem<string> to the demo’s comboBoxItems list.