fix: add robust error handling and fallback mechanisms to clipboard c…

[N-i-xx]

Pull Request Description
🚀 Overview
Implements a robust fallback mechanism for copy-to-clipboard interactions when the native modern navigator.clipboard API fails or is unavailable (e.g., older browser versions, missing secure contexts, or user permission denials).

🛠️ Changes Made
Error Resilience: Wrapped native clipboard calls in a try/catch block to handle exceptions gracefully instead of failing silently.

Legacy Compatibility: Integrated a fallback mechanism using a temporary off-screen input element and document.execCommand('copy') if the modern API rejects or is absent.

User Feedback: Hooked up fallback toast notifications to prompt users to copy text manually if both programmatic methods fail.

Telemetry Protection: Preserved original error payloads in console.error logs to ensure operational debugging remains uninhibited.

🎯 Acceptance Criteria Verified
[x] Clipboard write failures surface a visible error or fallback interaction.

[x] Fallback flow remains entirely invisible when native clipboard operations execute successfully.

[x] Native exceptions are caught and logged for diagnostic tracking.

closes #367

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