feat(Editor): update return type nullable

[ArgoZhang]

Link issues

fixes #6657

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

Update the Editor component to use nullable return types for its callbacks and related methods, fixing issue #6657.

New Features:

• Allow Editor component return values to be nullable

Bug Fixes:

• Fix feat(Editor): update return type nullable #6657 by updating Editor return types to nullable

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[Copilot]

Pull Request Overview

This PR updates the BootstrapBlazor.SummerNote package version from 9.0.6 to 9.0.7 to fix issue #6657 related to making Editor component return types nullable.

• Updates BootstrapBlazor.SummerNote package dependency to version 9.0.7

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (fef83f6) to head (e68d995).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6658   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          739       739           
  Lines        31667     31667           
  Branches      4459      4459           
=========================================
  Hits         31667     31667           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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