Task(1017003)- System Toast Action Button Handling Documentation Update

[SekarSivalingam]

Description

This PR updates the customization.md documentation for the SfToastNotification control to include guidance on handling action button click events in system toast notifications.

AI Usage

Code Studio used in this PR/MR?

• Yes
• No

If Yes: Primary use (choose one)

• Generate new code
• Refactor/improve existing code
• Tests
• Bug fix / debugging help
• Docs / comments
• Review assistance (explanations/summaries)
• Other

Outcome

• Saved time (AI made development faster)
• Neutral (No major difference)
• Cost time (AI slowed things down)

Changes Included

1.Added two new subsections in customization.md explaining how to handle system toast action button click events for:

• .NET Framework projects
• .NET Core / .NET (Windows) projects

2.Added a sample reference pointing to a Syncfusion example that demonstrates system toast action button click handling.

[SyncfusionBuild]

Build Status: INQUEUE 🕒
Build Location: WPF-1017003

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: WPF-1017003

[SyncfusionBuild]

CI Status: FAILURE ❌
Source Compilation: SUCCESS ✅
Failure Reason: CI Failure with violation
Build Location: WPF-1017003
Technical Error(s): 0
Spelling Error(s): 1
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
Front matter Error(s): 1
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0