feat(Editor): update return type nullable

[ArgoZhang]

Link issues

fixes #537

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

Allow ImageUpload to return null and streamline JS stream reference creation in the SummerNote editor component.

Bug Fixes:

• Fix issue feat(Editor): update return type nullable #537 by updating the ImageUpload C# method to return a nullable string instead of an empty string default

Enhancements:

• Modify the JavaScript side to pass the file directly to DotNet.createJSStreamReference, removing the extra arrayBuffer allocation

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the ImageUpload API to return a genuinely nullable string and simplifies the JS implementation by passing the File object directly to the .NET stream reference.

Sequence diagram for updated image upload interaction

sequenceDiagram
    participant JS as JavaScript
    participant Editor as .NET Editor
    JS->>Editor: ImageUpload(name, contentType, size, JSStreamReference(file))
    Editor->>Editor: OpenReadStreamAsync(size)
    Editor->>Editor: OnFileUpload(file)
    Editor-->>JS: string? (nullable result)

Loading

Class diagram for updated Editor component ImageUpload method

classDiagram
    class Editor {
        +Task<string?> ImageUpload(string name, string contentType, long size, IJSStreamReference stream)
    }

Loading

File-Level Changes

Change	Details	Files
Allow ImageUpload to return null instead of defaulting to an empty string	Changed ImageUpload signature to return Task<string?> Removed the fallback return of empty string Adjusted return statement to propagate null when no file is uploaded	src/components/BootstrapBlazor.SummerNote/Components/Editor/Editor.razor.cs
Streamline .NET stream reference creation in JavaScript	Removed manual arrayBuffer() call Passed the File object directly to DotNet.createJSStreamReference	src/components/BootstrapBlazor.SummerNote/Components/Editor/Editor.razor.js

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#537	Update the return type of the Editor component's ImageUpload method to be nullable (string?).	✅

Possibly linked issues

• feat(Editor): update return type nullable #537: PR updates ImageUpload method's return type to nullable, resolving the issue.

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[sourcery-ai]

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