Show per-model token counts in TUI

[bcchew-art]

Summary

Surfaces per-model token totals in the By Model panel of the interactive dashboard. The token data (input, output, cacheRead, cacheWrite) was already computed in session.modelBreakdown.tokens and exposed in codeburn report --format json, but not rendered in the TUI. This adds a single compact tokens column between cost and cache.

• formatTokens extended to emit a B suffix for values at or above 1e9 so per-model cache totals (typically multi-billion) render as e.g. 4.09B instead of overflowing.
• ModelBreakdown now aggregates outputTokens in addition to the existing input/cacheRead/cacheWrite, and shows the sum per row.
• Zero-token rows display - rather than 0.

Before / After

Before (no tokens column):

│ By Model                                                 │
│                              cost  cache  calls          │
│ ██████████ Opus 4.6       $879.94  96.1%   4817          │
│ ████░░░░░░ Opus 4.7       $373.89  94.8%   2325          │

After:

│ By Model                                                 │
│                              cost  tokens  cache  calls  │
│ ██████████ Opus 4.6       $879.94   1.14B  96.1%   4817  │
│ ████░░░░░░ Opus 4.7       $373.89  432.7M  94.8%   2325  │
│ █░░░░░░░░░ Sonnet 4.6      $93.68  156.3M  93.4%   3126  │
│ ░░░░░░░░░░ Haiku 4.5        $4.42   23.4M  92.8%    259  │
│ ░░░░░░░░░░ <synthetic>    $0.0000       -      -      1  │

Test plan

• npm run build succeeds
• npx vitest run passes (244/244, 6 new tests covering formatTokens B suffix and the per-model aggregation)
• npx tsx src/cli.ts rendered and visually checked at 80, 120, and 160 column widths
• Period switching (1-5) still re-renders the panel correctly
• Zero-token rows show -, not 0.00K

[github-actions]

Very new or empty account. Thorough review recommended.

  Low confidence

---

Key Signals

Account age	Contribution quality	Recent activity
1 months	N/A	Minimal
New account	No PRs yet	2/12 months

Repos	Followers	Unique mergers	100+ ★ repos	Signed
7	0	0	0	✗

View full details

• This repo: First-time contributor

_firstlook