refactor(SummerNote): update form label style

[ArgoZhang]

Link issues

fixes #439

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

Bug Fixes:

• Fix inconsistent spacing for form labels, groups, and checkbox inputs in SummerNote editor

[sourcery-ai]

Reviewer's Guide

This PR refactors the SummerNote editor’s form label styling by introducing consistent bottom margins for form groups, labels, file-select groups, and checkbox inputs, and updates the project file to include these style changes.

File-Level Changes

Change	Details	Files
Refactored form group and label spacing in the editor CSS	Added bottom margin to all .note-form-group elements in modals except the last child Introduced .5rem bottom margin for .note-form-label and .note-group-select-from-files Adjusted right margin on checkbox inputs for the open-in-new-window option	src/components/BootstrapBlazor.SummerNote/wwwroot/css/editor.css
Updated project configuration to include the revised styles	Modified csproj to embed and reference the updated editor.css resource	src/components/BootstrapBlazor.SummerNote/BootstrapBlazor.SummerNote.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#439	Update the form label style in the SummerNote editor.	✅

Possibly linked issues

• refactor(SummerNote): update form label style #439: The PR updates form label styles as requested in the issue by modifying editor.css.

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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: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue (bug_risk): Missing . before sn-checkbox-open-in-new-window in selector

Add a . before sn-checkbox-open-in-new-window so it targets a class, e.g.: .form-check .sn-checkbox-open-in-new-window .form-check-input.