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/tests/e2e/map-roundtrip.spec.ts

@@ -161,7 +161,6 @@ async function readPrimitiveCount(page: Page): Promise<number> {
 
 const NON_MAP_VIEWS: ReadonlyArray<{ label: string; testid: string }> = [
 	{ label: "report", testid: "view-menu-item-report" },
-	{ label: "designer-ship-class", testid: "view-menu-item-designer-ship-class" },
 	{ label: "designer-science", testid: "view-menu-item-designer-science" },
 	{ label: "mail", testid: "view-menu-item-mail" },
 ];