/talk shows the agent's thinking collapsed, a steps line, and links to what it opened or changed #8821

Follows #8752 (pull #8755 shipped copy, who and when, stick-to-bottom and the jump button, tool cards with Confirm and Cancel). Keep src/web/pages/talk.ts's server-drawn history and streaming, a small script, no React, and #8719's quiet rules.

Done looks like:

• [x] Thinking, when the run emits it, is one collapsed line that opens on demand.
• [x] A turn that runs tools shows one quiet steps line ("read 3 files, opened #12").
• [x] Each issue, pull, file or app the turn opened or changed is a link under the reply.
• [x] Tests from a recorded run's events.

Files: src/crew/conversation.ts, src/web/pages/talk.ts, src/web/pages/talk_client.ts, test/talk-page.test.ts

Reviewed pull #8845 at its head: ticked Thinking, when the run emits it, is one collapsed line that opens on demand.; A turn that runs tools shows one quiet steps line ("read 3 files, opened #12").; Each issue, pull, file or app the turn opened or changed is a link under the reply.; Tests from a recorded run's events..