fix(Textarea): set UseShiftEnter to true not work

[ArgoZhang]

Link issues

fixes #6057

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

Fix textarea Shift+Enter behavior and update variable declaration in Textarea.razor.js

Bug Fixes:

• Prevent default action on plain Enter when shift-enter mode is enabled

Enhancements:

• Use const instead of var for element reference

[sourcery-ai]

Reviewer's Guide

Refactors the textarea initialization by switching var to const and corrects the Shift+Enter key handling by reversing the condition and adding an explicit boolean check to prevent default only when intended.

File-Level Changes

Change	Details	Files
Use constant declaration for element reference	Replaced var with const for the textarea element	src/BootstrapBlazor/Components/Textarea/Textarea.razor.js
Fix Shift+Enter default prevention logic	Reversed the order of useShiftEnter and shiftKey checks Added explicit shiftKey === false comparison for clarity	src/BootstrapBlazor/Components/Textarea/Textarea.razor.js

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6057	Enable Shift + Enter to create a new line in the Textarea component when UseShiftEnter is set to true.	✅
#6057	Ensure that pressing Enter triggers form submission when UseShiftEnter is enabled.	✅

Possibly linked issues

• bug(Textarea): set UseShiftEnter to true not work #6057: The PR modifies the Textarea component's JavaScript to fix the issue where content cannot be printed.
• bug(Textarea): set UseShiftEnter to true not work #6057: The PR modifies the Textarea component's JavaScript to fix the exception bug described in the issue.

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[sourcery-ai]

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

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6d1860f) to head (f5afc5e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6059   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          701       701           
  Lines        30956     30956           
  Branches      4378      4378           
=========================================
  Hits         30956     30956           

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