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feat: v0.16.1 — ISS-007 smooth client-side sim clock with per-snapshot re-sync
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kamilkrzywda
2026-09-19 14:00:47 +00:00
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# Changelog
## v0.16.1 — 2026-09-19 14:00
- **Smooth client-side sim clock with per-snapshot re-sync (ISS-007).** The left-pane "Time" display used to jump once per 1 s poll because it rendered the snapshot's `clockMs` verbatim. It now ticks smoothly on the client between polls: new hook `lib/useSimClock.ts` keeps an anchor `{clockMs, at, timeScale, paused}` and re-derives the display clock every ~100 ms as `anchor.clockMs + (now − at) × timeScale` — exactly the server's own tick model (`tickOnce`: real-time × timeScale), so client extrapolation mirrors authoritative game time. Every new snapshot re-anchors to server truth, bounding any drift by network latency only; while paused the display is frozen at the anchor value (advance 0). The pure core `advanceSimClock(anchor, nowMs)` is exported and unit-tested in node
- **LeftPane consumes it for the `sim-clock` paragraph ONLY** (`components/LeftPane.tsx`): fed with EFFECTIVE controls `{timeScale: pendingScale ?? snapshot scale, paused}` so a slider drag or pause click takes effect on click/drag without waiting for a confirming snapshot; the `(paused)` suffix keeps coming from the effective paused flag. Right-pane deadline/penalty previews are untouched — they stay computed from the snapshot's `clockMs` (deterministic against server truth)
- No server or OpenAPI changes — display-only client work
- Tests: unit — new suite in `lib/useSimClock.test.ts` pins the extrapolation math (exact elapsed × scale advance, frozen while paused at any scale, zero-elapsed identity, clock-skew clamp never goes backwards, mirrors the tickOnce formula under the 2 s clamp). e2e (`panes.spec.ts`) — new test: at scale 1000 sample `sim-clock` three times ~1.3 s apart real time and assert the displayed clock strictly advances between CONSECUTIVE samples (with poll-only rendering a pair could straddle zero snapshots and not change), plus format check and a total-advance sanity bound
- Verified: `tsc --noEmit` clean; unit suite green locally; e2e not run locally by design — CI verifies against an isolated stack
## v0.16.0 — 2026-09-19 12:18
- **Weight-proportional fuel burn (ISS-005, part A).** Fuel no longer burns at a constant L/km — the instantaneous rate is proportional to total weight, `r(F) = k·(We + ρF)` L/km with We the empty weight and ρ = 0.8 kg/L (Jet-A1), so a heavier plane burns more per km and a tank gets lighter as it empties. The constant `k` is calibrated so a FULL tank burns exactly the catalog's old `burnPerKm`, keeping full-tank departure behavior identical to before; divergence only grows in flight as fuel drops off. Closed forms of `dF/dx = −k(We + ρF)` live in `lib/sim/movement.ts` (single source of truth):
- `fuelAtWeighted(startFuel, burnPerKm, emptyWeightKg, maxFuel, distanceKm, progress)` — fuel remaining after flying `progress` of the leg (replaces the old constant-rate `fuelAt`, which is removed)