tui: project dashboard pane (C0–C3)

[edwin-zvs]

Summary

Selecting a project header in the session list used to paint a flat status · title · harness list in the main pane — less information than the sidebar, with no hand-off. This turns that surface into a live project dashboard.

• C0 — Header tally (working / wants you / errored), member roster with full-mode detail, summary preview chrome for the hottest (or hovered/cursor) session
• C1 — Client activity feed of state transitions; click a row to open that session
• C2 — Project-scoped token meter fed from the same Cost/busy path as the fleet meter
• C3 — Cached recent chat messages in the preview strip; soft empty when none are cached

Interaction: list focus keeps the dashboard watch-only; view focus moves the member cursor with Up/Down; Enter / click opens the target session. Spec: specs/0191-project-dashboard-pane.md.

Test plan

• Create a project with 2–3 sessions (mixed harnesses); select the project header and confirm dashboard layout (header, members, preview)
• Drive one session to Running and another to needs-attention; confirm sort order and tally glyphs
• Focus the view (Enter on project), move cursor with Up/Down, Enter to open a member
• Click a member row and an activity feed line; both should select that session
• With an LLM session generating tokens, confirm the project meter fills; shell-only project shows empty meter line
• Confirm list focus still navigates the sidebar while the dashboard is visible
• cargo test -p construct-cli --bin construct project_dashboard