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 rows in chat timeline after a new user turn starts

• deriveWorkLogEntries in session-logic.ts now accepts an optional turnId filter; when omitted, it returns work entries across all turns instead of filtering to the active turn.
• ChatView no longer passes activeLatestTurn?.turnId to deriveWorkLogEntries, so the timeline includes tool/work entries from prior turns.
• A browser test verifies that historical tool rows remain visible after a new latest turn is added to the store.

^{Macroscope summarized 943afd5.}

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[zortos293]

This is more complete version of the one that i did and should be merged asap

[zortos293]

I couldn’t find a issue/pr specifically for this problem none has been reported yet

[maria-rcks]

yeah looks like there isnt any

[binbandit]

maybe im just super good at seeing tiny problems 🤷‍♀️