Confirm copies to screen readers and say when copying fails #343

MessageCopyButton confirms success only with an icon; code-block copying changes its text and accessible name to "Copied". Neither provides a dedicated live confirmation, and neither shows clipboard failures.

Where to start

1. The thread has two copy implementations: MessageCopyButton swallows errors and disables itself while it shows the check; the code block CopyButton has no error handling at all.
2. Make one small shared copy helper (copied and failed state plus a polite live-region message) and use it in both.
3. Show a short "Couldn't copy" state on failure, and keep the button enabled while it shows "Copied".

Code to look at:

• frontend/components/session-ui/message-copy-button.tsx:50
• frontend/components/session-ui/message-copy-button.tsx:68
• frontend/components/ai/code-block.tsx:65

Done when

• Both buttons go through one helper.
• A unit test mocks navigator.clipboard to resolve and to reject and checks both states.
• VoiceOver or NVDA reads "Copied" after a copy.

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