Fix ComboBox sample in BitDorpdown demo page (#12256)

[Cyrus-Sushiant]

closes #12256

Summary by CodeRabbit

• Documentation
  • Updated dropdown component demo examples with dynamic item addition functionality, demonstrating how to append new items to a dropdown list at runtime.

[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: a16ea7f9-00e3-49dc-ab5a-3763a9b939f8

📥 Commits

Reviewing files that changed from the base of the PR and between 19f78b8 and 7d911dd.

📒 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

A missing method implementation for HandleOnDynamicAdd was added to the BitDropdown component demo's code-behind file, enabling dynamic item addition to the combo box sample. The method appends provided items to the comboBoxItems collection.

Changes

Cohort / File(s)	Summary
Demo Sample Implementation src/BlazorUI/Demo/Client/.../Dropdown/_BitDropdownItemDemo.razor.samples.cs	Added HandleOnDynamicAdd() method to handle dynamic item addition in the "Combo Dynamic" sample.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A method was missing, oh what a sight,
Now dynamic combos work just right!
Five lines of code, so clean and sweet,
Our dropdown demo is now complete! ✨

🚥 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 PR title clearly indicates the main change: fixing the ComboBox sample in the BitDropdown demo page, which aligns with the changeset's addition of the missing HandleOnDynamicAdd method.
Linked Issues check	✅ Passed	The PR successfully addresses issue #12256 by implementing the missing HandleOnDynamicAdd method that was referenced but not implemented in the Dynamic ComboBox sample.
Out of Scope Changes check	✅ Passed	The changes are focused solely on adding the missing HandleOnDynamicAdd method to fix the demo sample, with no unrelated modifications detected.
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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