feat: v0.20.0 — ISS-021 move On board to left pane, widen left 360/280

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## v0.20.0 — 2026-09-19 19:21
+- **On board moved to the left pane (ISS-021).** The "On board" section (per-plane blocks with loaded/expired cargo rows, Refuel-for-leg / Fly-to / Abandon + penalty preview) now renders in `components/LeftPane.tsx` between Fleet and Time — wallet stays on top. The JSX moved verbatim (same testids: `onboard-{planeId}`, `onboard-package-{pkg.id}`, `refuel-for-*`, `fly-to-*`, `abandon-*` + penalty preview), along with the `onboard` computation (`planes.filter(flying || slotsUsedFor > 0)`) and per-plane cargo filter. All onboard e2e locators are global testids, so existing specs work unchanged
+- **Left pane widened: grid swapped to 360/1fr/280.** `.app-shell` in `app/globals.css` goes from `280px minmax(0, 1fr) 360px` to `360px minmax(0, 1fr) 280px` — total fixed width stays 640 px, so the map column is pixel-identical (map.spec.ts clicks via dynamic `map.project()`). Stale comments updated (on-board blocks now in the left pane; Relocate row comment reflects the 280 px right pane)
+- **Shared action runner hook.** RightPane's local `runAction` (busy gate, inline pane error + shell toast on failure, full post-action snapshot pushed via `applySnapshot`) extracted to new `lib/useGameAction.ts`: `useGameAction(state, applySnapshot, onError) → { runAction, busy, actionError }`, exact semantics kept incl. the non-2xx throw/catch and inline-error auto-clear on the next snapshot. Used in BOTH panes; LeftPane receives `applySnapshot` from the shell (`app/page.tsx`). RightPane keeps `[data-testid="right-error"]`; LeftPane gains a matching `[data-testid="left-action-error"]`. Pure helpers `slotsUsedFor` / `loadEligiblePlanes` stay exported from RightPane (unit tests import them there; LeftPane imports `slotsUsedFor` from it); the Market Relocate row + `/api/airports` fetch stay in RightPane
+- Tests: e2e — `panes.spec.ts` first test now also asserts the "On board" heading is visible inside `[data-testid="left-pane"]` and absent from the right pane; stale header comments updated in `actions.spec.ts` / `right-pane.spec.ts`. No unit-test changes (baseline 283)
+- Verified: `tsc --noEmit` clean; unit suite green locally; e2e not run locally by design — CI verifies against an isolated stack
+
 ## v0.19.0 — 2026-09-19 18:05
 - **Auto-slow to 1× when all planes have landed (ISS-011).** When the last plane in flight lands, the sim slows down on its own so an idle fleet doesn't sit at 1000×. Server-side and authoritative: `tickOnce` (`lib/sim/engine.ts`) now remembers how many planes `deliverPackages` finalized during a tick, and when ≥1 plane landed this tick AND no plane remains with status `'flying'` AND the sim is not paused, it persists `timeScale = 1` on the same `sim_state` write as the clock — so the UI slider reflects it on the very next snapshot (no API or OpenAPI change: timeScale is still set via the existing `POST /api/sim`, and `clampTimeScale` semantics are untouched since 1 is a valid ladder value)
 - **Arrival-triggered, not idle-enforced.** The trigger fires only on the tick that processes a landing — a grounded fleet at high scale with no flight ever happening is left alone (this keeps the existing slider e2e in `panes.spec.ts` green: it sets 1000× and expects the server to confirm it while nothing is flying). Paused state is untouched: while paused no landings are processed, so a paused sim never auto-slows