feat(product): add share button to product details page

[jyoti430]

Summary

Closes #424

This PR adds a Share button to the Product Details page, allowing users to quickly copy the current product URL to their clipboard.

Changes Made

• Added a Share icon beside the product title.
• Implemented clipboard copy functionality using the Clipboard API.
• Added a success toast when the product link is copied successfully.
• Added an error toast if copying the link fails.

Additional Notes

While syncing my branch with the latest main, I resolved merge conflicts in ProductPage.jsx. During this process, I updated the product fetch logic to use the current API response structure (data.data) so the Product Details page continues to render correctly with the latest upstream changes.

Testing

• Verified the Share button is displayed on the Product Details page.
• Verified clicking the Share button copies the current product URL to the clipboard.
• Verified a success toast is shown after copying the link.
• Verified an error toast is displayed if clipboard copying fails.

Note: ProductPage currently has no existing test suite. Since it depends on routing, API calls, Zustand stores, sockets, and multiple child components, adding isolated tests for this small UI feature would require extensive mocking. I'm happy to add tests if that is the preferred approach.

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