Show cache-read usage and quota pace in Capacity Dock

[ozymandiashh]

Summary

• Show provider-scoped cache-read tokens in the Capacity Dock’s Today section, alongside input, output, calls and the existing cost. Known zero displays as 0; missing or incomplete historical accounting stays unknown. Cache reads are already included in cost, so this adds visibility without changing pricing.
• Add per-window quota pace and estimated exhaustion using the existing whole-window average calculation. Captions require valid durations and fresh data; short windows retain deficit/reserve guidance without an exhaustion ETA. Four quota windows use a two-column grid to keep scope labels, reset times and estimates readable.

The JSON field is optional for compatibility with older clients and histories. Status snapshot revision 7 invalidates older cached payloads without purging daily history. No additional polling is introduced.

Testing

• Tested against a copied real Codex session in an isolated environment: CLI Today and the direct parser both reported 11,148,288 cache-read tokens, 84 calls and one session.
• npm test: 3,748 passed, 5 skipped, versus 3,738 passed, 5 skipped on the base revision; zero failures. Covers durable/fresh history, provider/date/config filters, known zero, incomplete legacy data and snapshot invalidation.
• npm run build and tsc --noEmit passed.
• Native CapacityDockDetailView render harness: 62 checks passed across 0.9×, 1× and 1.25× scales and all four dock edges; rendered layouts inspected visually.
• Swift Testing subset: 457 tests in 55 suites passed, versus 424 tests in 53 suites on the base. Includes fresh/stale quota samples, invalid windows, layout sizing, legacy payload decoding and overlapping/cancelled refreshes. swift build --jobs 2 passed.

Local Swift validation used an isolated copy of the Swift Testing suites because this machine has Command Line Tools without XCTest. macOS CI subsequently passed the full suite: 129 XCTest tests and 457 Swift Testing tests, plus release packaging.

All 18 CI checks passed on 98ad43fe, including Windows tests and packaging (the release-only asset check is skipped).