feat(tui): match Elixir Symphony STATUS dashboard layout

[ridermw]

Goal

The Rusty TUI dashboard should match the Elixir reference as closely as possible.

Reference screenshot:

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Current State vs Target

Header / Summary Stats

The Elixir dashboard shows a SYMPHONY STATUS block with these fields:

Field	Elixir	Rusty Status
Agents	19/50 (running/max)	⚠️ Partial — shows running count but not max concurrency
Throughput	658,875 tps	❌ Missing
Runtime	1m 54s	✅ Present
Tokens	in 38,183,882 | out 368,361 | total 38,552,243	⚠️ Shows total only; missing in/out breakdown
Rate Limits	codex | primary n/a | secondary n/a | credits n/a	❌ Missing
Project	Clickable link to project issues page	❌ Missing
Next refresh	1s countdown	❌ Missing

Running Agents Table

Column	Elixir	Rusty Status
ID	Issue identifier (e.g. MT-725)	✅ Present (as Issue)
Stage	Issue state (Todo, In Progress, Rework)	✅ Present (as State)
PID	OS process ID	✅ Present
Age / Turn	1m 19s / 1	⚠️ Shows Turns only — missing age
Tokens	1,442,520 (comma-formatted total)	✅ Present
Session	Truncated session ID 019c...ac5e10	⚠️ Missing in TUI (present in web dashboard)
Event	Full event text	⚠️ Truncated to 18 chars — should show more

Backoff Queue Table

Column	Elixir	Rusty Status
Issue	Identifier	✅
Attempt	Retry count	✅
Due at	Timestamp	✅
Error	Error message	✅ (truncated)

The backoff queue is at parity. Main gaps are in the header stats and running table.

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Implementation Tasks

1. Header block: Replace the 4-card horizontal layout with a vertical SYMPHONY STATUS block matching the Elixir format — one stat per line, labels left-aligned
2. Add missing header fields: Throughput (tps), Rate Limits, Project link, Next refresh countdown
3. Running table columns: Rename/reorder to ID | Stage | PID | Age / Turn | Tokens | Session | Event
4. Age / Turn column: Combine elapsed time + turn count (e.g. 1m 19s / 2)
5. Session column: Show truncated session ID in TUI (019c...ac5e10 format)
6. Event column: Show full event text (or at least more than 18 chars — allow horizontal scroll or flex width)
7. Bullet indicators: Each running row has a • prefix (teal/cyan) as a status dot