🤖 fix: use unread sidebar bar indicator

[ammar-agent]

Summary

• Show unread workspaces using the existing left selection bar with a muted color to avoid competing with the archive button.
• Keep per-workspace unread timestamps (with migration) while dropping the unused manual toggle wiring.

Background

• The unread dot previously competed with the archive affordance for the same slot.
• We already track unread timestamps per workspace, so we can style an existing indicator instead of adding UI chrome.

Implementation

• Render an absolute left bar for selected/unread states with a tooltip on unread.
• Preserve the selected bar color and use a muted bar color for unread items.
• Keep the per-workspace storage migration in useUnreadTracking.

Validation

• make static-check

Risks

• Low: UI-only change to the sidebar indicator and continued localStorage migration.

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[chatgpt-codex-connector]

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[ammar-agent]

@codex review

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Codex Review: Didn't find any major issues. Keep it up!

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