feat(ui): Phase 30 ship-class calculator with goal-seek and reach circles

Fuse the standalone ship-class designer (Phases 17/18) into a sidebar calculator: live mass/speed/attack/defence/bombing results, a planet build-rate readout, single-target goal-seek, a modernization-cost mode, and auto reach circles on the map for the selected planet.

pkg/calc becomes the single source for the new math (no mirroring): extract BombingPower from the engine model and the per-turn ship-production loop from controller.ProduceShip into pkg/calc (engine now delegates), and add inverse goal-seek solvers in pkg/calc/solve.go. Thin-bridge the combat, planet-build, and solver functions through ui/core/calc + ui/wasm and rebuild core.wasm.

Remove the standalone designer view/route; the ship-classes table and the view/bottom menus open the calculator via a shared request store.

Docs: rewrite ui/PLAN.md Phase 30, adjust Phase 34 (realistic forecast + CAP/COL ownership), add ui/docs/calculator-ux.md, extend calc-bridge.md, fix navigation.md; remove ui/CALCULATOR.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/frontend/src/lib/active-view/map.svelte

@@ -31,6 +31,8 @@ preference the store already manages.
 	} from "../../map/index";
 	import { buildCargoRouteLines } from "../../map/cargo-routes";
 	import { buildPendingSendLines } from "../../map/pending-send-routes";
+	import { computeReachCircles } from "../../map/reach-circles";
+	import { reachStore } from "$lib/calculator/reach.svelte";
 	import {
 		reportToWorld,
 		type HitTarget,
@@ -196,6 +198,11 @@ preference the store already manages.
 		void toggles.bombingMarkers;
 		void toggles.visibleHyperspace;
 
+		// Subscribe to the calculator's published reach so the rings
+		// redraw as the design or the selected planet changes.
+		void reachStore.origin;
+		void reachStore.speedPerTurn;
+
 		// Phase 29 visibility derivation. Cargo routes and pending-
 		// Send overlay are extras (no Pixi remount on flip); the
 		// cascade-filtering happens here so the extras list shrinks
@@ -219,8 +226,14 @@ preference the store already manages.
 		// the visible set reliably triggers a push.
 		const draftCommands = orderDraft?.commands ?? [];
 		const draftStatuses = orderDraft?.statuses ?? {};
+		const reachOrigin = reachStore.origin;
+		const reachFingerprint =
+			reachOrigin === null
+				? ""
+				: `${reachOrigin.x},${reachOrigin.y},${reachStore.speedPerTurn}`;
 		const extrasFingerprint =
 			`cr=${toggles.cargoRoutes ? "1" : "0"}|hp=${hiddenPlanetFingerprint}|` +
+			`reach=${reachFingerprint}|` +
 			computeRoutesFingerprint(report.routes) +
 			"|" +
 			computePendingSendFingerprint(draftCommands, draftStatuses);
@@ -256,6 +269,7 @@ preference the store already manages.
 							draftStatuses,
 							toggles,
 							hiddenPlanetNumbers,
+							mode,
 						),
 					);
 				});
@@ -289,6 +303,7 @@ preference the store already manages.
 		draftStatuses: Readonly<Record<string, string>>,
 		toggles: MapToggles,
 		hiddenPlanetNumbers: ReadonlySet<number>,
+		mode: "torus" | "no-wrap",
 	): import("../../map/world").Primitive[] {
 		const skip = hiddenPlanetNumbers.size > 0 ? hiddenPlanetNumbers : undefined;
 		const cargo = toggles.cargoRoutes
@@ -300,7 +315,21 @@ preference the store already manages.
 			draftStatuses,
 			skip ? { skipPlanets: skip } : undefined,
 		);
-		return [...cargo, ...pending];
+		// Reach circles published by the ship-class calculator. Empty
+		// when no own planet is selected or the design is invalid, so
+		// this is a no-op for the rest of the map.
+		const reachOrigin = reachStore.origin;
+		const reach =
+			reachOrigin !== null && reachStore.speedPerTurn > 0
+				? computeReachCircles(
+						reachOrigin,
+						reachStore.speedPerTurn,
+						report.mapWidth,
+						report.mapHeight,
+						mode,
+					)
+				: [];
+		return [...cargo, ...pending, ...reach];
 	}
 
 	function applyVisibilityState(
@@ -342,6 +371,7 @@ preference the store already manages.
 					draftStatuses,
 					toggles,
 					hiddenPlanetNumbers,
+					mode,
 				),
 			);
 			lastExtrasFingerprint = extrasFingerprint;