fix: improve clipboard handling with optional chaining

[agatha197]

resolves https://github.com/lablup/backend.ai-webui/issues/2843

Changes: Improves clipboard functionality across browsers by:

• Adding optional chaining operators to clipboard API calls for better error handling
• Introducing a new copyText() method in session list for cross-browser text copying
• Implementing fallback copy mechanism for browsers without clipboard API support

Rationale: The clipboard operations needed to be more robust across different browsers and handle cases where the clipboard API might be unavailable or restricted.

Effects:

• More reliable text copying functionality in session management
• Better error handling for clipboard operations
• Support for browsers without native clipboard API

Checklist:

• [ ] Mention to the original issue
• [ ] Documentation
• [ ] Minium required manager version
• [ ] Specific setting for review
• [ ] Minimum requirements to check during review
• [ ] Test case(s) to demonstrate the difference of before/after

Testing Requirements:

• Verify clipboard operations in Chrome/Safari
• Test copying functionality in browsers without clipboard API
• Confirm error handling when clipboard access is denied

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[agatha197]

• #2842 👈 (View in Graphite)
• main

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[graphite-app[bot]]

Merge activity

• Nov 19, 6:25 PM EST: A user added this pull request to the Graphite merge queue.
• Nov 19, 6:27 PM EST: A user merged this pull request with the Graphite merge queue.