feat: Add toast feedback for Commit Streaks copy button

[ni2-vsv11]

Related Issue

Closes #709

Summary

Added toast feedback for the Commit Streaks copy button to improve user interaction and accessibility.

Changes Made

• Added success toast notification after successful copy action
• Added error toast notification when clipboard copy fails
• Preserved existing UI and button behavior
• Improved feedback consistency across interactions

Testing

• Tested successful clipboard copy locally
• Tested clipboard failure handling
• Verified no UI regressions

Screenshots

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[github-actions]

GSSoC Label Checklist 🏷️

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds user-facing toast notifications for the “copy streak stats” action by integrating the sonner toast library and mounting a global toaster in the app layout.

Changes:

• Add sonner dependency and render <Toaster /> in the root layout.
• Update handleCopy to use async/await and show success/error toasts.
• Improve UX for unsupported clipboard environments with an explicit error toast.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/components/StreakTracker.tsx	Uses sonner to toast success/failure for clipboard copy, refactors copy handler to async/await.
src/app/layout.tsx	Adds <Toaster /> so toast messages can render globally.
package.json	Adds sonner dependency required for new toast functionality.

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[github-actions]

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[Priyanshu-byte-coder]

The sonner toast integration is a great improvement, but two issues need fixing before merge:

1. Missing EOF newline in layout.tsx: The PR removes the trailing newline (} with no newline at end of file). All files must end with a newline — this will block CI.

2. Indentation in StreakTracker.tsx: The handleCopy function starts at column 0 instead of being indented 2 spaces inside the component body. Please align it with the rest of the component methods.

[Priyanshu-byte-coder]

Two issues to fix:

1. Missing EOF newline in src/app/layout.tsx
The diff ends with +}\ No newline at end of file. Please add a trailing newline.

2. Indentation bug in StreakTracker.tsx
const handleCopy = async () => { is at column 0 instead of 2 spaces. It's inside the component body — please indent it correctly.

[ni2-vsv11]

Addressed all requested review changes ✅

• Fixed indentation in StreakTracker.tsx
• Added trailing newline in layout.tsx
• Resolved merge conflicts with latest main

Please review again.