fix(web): preserve historical tool styling in chat history

[binbandit]

Summary

• keep historical tool and work rows visible after a later turn becomes the latest turn
• cover the timeline projection change with unit and browser regressions for the history-to-new-turn transition

Validation

• bun run fmt
• bun run lint
• bun run typecheck
• bun run test src/session-logic.test.ts
• bun run test:browser src/components/ChatView.browser.tsx

Note

Preserve historical tool activity rows in chat timeline across turns

• Removes the latest-turn filter from deriveWorkLogEntries in ChatView.tsx, so tool/work log entries from all previous turns are included in the timeline, not just the active turn.
• Makes the turnId parameter in deriveWorkLogEntries optional; omitting it returns entries across all turns.
• Adds a browser integration test verifying that historical tool rows remain visible after a new user turn becomes the latest turn.

^{Macroscope summarized f6a7301.}

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