centralize toast lifecycle management

[ash1shkumar]

📝 Description

This PR improves toast notification lifecycle management by introducing reusable helpers for toast creation and dismissal handling.

Previously, toast creation, scheduling, and removal behaviors were coordinated directly within the notification workflow. As notification usage grows across the application, maintaining consistent lifecycle behavior can become increasingly difficult.

Changes Implemented

• Introduced reusable toast creation helper
• Added centralized toast dismissal scheduling
• Standardized notification lifecycle handling
• Reduced duplicated dismissal logic
• Improved separation between toast rendering and lifecycle management
• Enhanced maintainability of notification workflows

Benefits

• More consistent toast behavior
• Improved lifecycle coordination
• Reduced maintenance complexity
• Cleaner notification management architecture
• Better extensibility for future notification features
• Easier debugging and lifecycle tracking

🎯 Type of Change

• Refactoring
• Code Quality Improvement
• Maintainability Enhancement

✅ Testing

• Verified success notifications display correctly
• Verified error notifications display correctly
• Verified info notifications display correctly
• Verified automatic toast dismissal behavior remains functional
• Verified manual toast dismissal behavior remains functional
• Verified duplicate notification prevention remains unchanged
• Verified maximum toast limit enforcement remains functional
• Verified notification rendering behavior remains unchanged

Fixes #213

Expected Labels

level3 NSoC'26

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