Final output message: selectable text, copy button, and clickable links

[aj47]

Feature Request

Improve the final output message UI with the following enhancements:

Requirements

1. Selectable text — Users should be able to highlight and select text in the final output message (currently may be blocked by pointer-events or user-select CSS).

2. Copy button — Add a copy-to-clipboard button on the output message so users can quickly copy the full response without manually selecting all text.

3. Clickable links — URLs in the output message should be rendered as clickable hyperlinks, opening in a new tab/window.

Why

Currently the output message text cannot be selected or copied easily, and links appear as plain text. This makes it hard to act on information in responses — especially for sharing, referencing URLs, or copying code/data from the assistant's reply.

Acceptance Criteria

• Text in output message is selectable via mouse/touch
• Copy button copies full message text to clipboard
• URLs in message text are rendered as <a> tags and open in new tab
• UX is clean and does not interfere with TTS or voice playback controls