Add copy affordances, collapsible long content, and follow-the-tail s…

[iceljc]

…crolling

Chat and log panes:

• Copy button on each content log entry; timestamp moves to its own row beneath the agent name and the button.
• Copy button on fenced code blocks in agent messages. The button is emitted by a marked renderer override so it survives streaming re-renders, and the code is read back out of the DOM on click so the clipboard matches the screen and no message content passes through generated markup. Off by default elsewhere via a new copyableCode prop.
• Both the message thread and the log panes now follow new content whenever they are already at the bottom, instead of only after the jump button was pressed. Scrolling back down resumes following on its own.

Collapsible long content:

• New shared CollapsibleText component: clips past ~10 measured lines, with a fade mask and click-anywhere or keyboard toggling.
• Applied to the chat bubbles (held off while a reply streams), and it now backs the content log rows and the conversation page's dialog entries, replacing three separate hand-rolled implementations. Removes the dialog page's hardcoded-white '...' indicator, which was wrong in dark mode, and the double clamp it needed to work around Markdown's inner BFC.

Class naming:

• Rename the agent detail page's ad- prefix to agd-; ad blockers ship element-hiding rules that match a leading ad- and were hiding the page's layout. cta-popup renamed to cta-overlay as a precaution.

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