[Xp-boss]

💡 What: Added visual "Copied!" feedback to the JSON copy action and added missing accessible ARIA labels to icon-only buttons in the DevTools client web UI.
🎯 Why: Previously, clicking the copy button in the network response/payload viewer provided no immediate visual confirmation that the JSON was successfully copied to clipboard, and icon-only buttons (theme toggle, group by domain, copy, download) lacked ARIA labels for screen readers.
📸 Visual: Clicking "Copy JSON" now transitions to a green checkmark with "Copied!" text for 2 seconds.
♿ Accessibility: Icon-only buttons now have descriptive aria-label attributes (aria-label="Switch to light/dark mode", aria-label="Group by Domain", aria-label="Copy JSON" / "Copied to clipboard", aria-label="Download JSON").

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PR created automatically by Jules for task 14096003276745760123 started by @Xp-boss

[google-labs-jules]

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[github-actions]

📊 PR Size: size/M

• Lines changed: 65
• Additions: +56
• Deletions: -9
• Files changed: 1