fix(ui): keep prior tool calls visible in thread timeline

[zortos293]

What Changed

• Fixed the chat thread timeline so completed tool-call activity from earlier turns stays visible instead of disappearing when a newer turn becomes active.
• Moved the visible work-log derivation into ChatView.logic so the thread timeline uses thread-wide activity visibility rather than filtering to only the latest turn.
• Added a regression test covering completed tool calls from multiple turns to prevent this from breaking again.

Why

Previously, the timeline only derived visible tool activity for the active turn, which caused completed tool calls from prior turns to disappear from the thread view. That made the history feel incomplete and made it harder to understand what work had already happened in the conversation.

This change fixes that by deriving the visible work log from the full thread activity list, which keeps the timeline accurate and predictable while preserving a small, focused fix.

UI Changes

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Keep prior tool calls visible in thread timeline by removing turn scoping

Previously, workLogEntries in ChatView.tsx was derived with deriveWorkLogEntries(threadActivities, activeLatestTurn?.turnId), which scoped entries to the active/latest turn and hid tool calls from earlier turns. A new deriveVisibleThreadWorkLogEntries wrapper in ChatView.logic.ts calls deriveWorkLogEntries without a turn ID, so all completed tool call activities across all turns are retained in the timeline.

^{Macroscope summarized c6a514a.}

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[zortos293]

Better implementation in #905