feat: add copy-to-clipboard button to resource prompt cards

[nishupr]

Summary

Adds a functional "Copy" button to the prompt/code cards in the Resources section. Previously, the "Copy" badge was purely decorative (a <span> with no click handler) — users had to manually select and copy the text, which was error-prone for longer prompts.

Changes

• Replaced the static "Copy" <span> with an interactive <button> in src/components/home/ResourcesTabs.tsx
• Added handleCopyPrompt, which calls navigator.clipboard.writeText() to copy the prompt's example text
• Added copiedPromptTitle state to track which specific card was copied, so only that card shows feedback
• On successful copy, the button swaps to a checkmark icon and "Copied!" label for 2 seconds, then reverts
• Added a cleanup effect to clear the reset timer on unmount, preventing memory leaks / state updates on unmounted components
• Reused the same UX pattern already established in src/components/common/CodeBlock.tsx for consistency across the codebase

How to test

1. Run npm run dev
2. Navigate to the Resources / AI Prompts section
3. Hover over any prompt card to reveal the "Copy" button
4. Click it — confirm the clipboard contains the prompt text and the button shows a "Copied!" checkmark for ~2 seconds before reverting

Screenshots / Recording

Checklist

• Tested locally with npm run dev
• No console errors or warnings introduced
• Follows existing code style/patterns in the repo
• Linked to the issue below

Related Issue

Closes #751

[Aditya948351]

Thanks for working on this Issue @nishupr , I will merge this! Keep Growing in Open Source! Good luck !