fix: show unread error state in thread prefixes

[binbandit]

Summary

• derive an unseen error signal from error activities, failed turns, and session errors
• show an Error thread prefix before other sidebar status pills when that signal is present
• clear the unread error state when the user opens the affected thread

Validation

• bun run test src/components/Sidebar.logic.test.ts
• bun fmt
• bun lint
• bun typecheck

Note

Add unread error state to thread prefix pills in the sidebar

• Adds hasUnseenError in thread-status.ts that detects unseen errors from activities with tone: 'error', turn state, or session lastError, using a shared happenedAfterLastVisit helper.
• Updates resolveThreadStatusPill in Sidebar.logic.ts to return a red 'Error' pill when hasUnseenError is true, taking precedence over other statuses.
• Marks a thread as visited in ChatView.tsx when it becomes active and has an unseen error, clearing the error indicator.

^{Macroscope summarized 87fc95c.}

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[jamesx0416]

@binbandit Should probably add a screenshot