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>

game/internal/model/game/group.go

@@ -3,7 +3,6 @@ package game
 import (
 	"fmt"
 	"galaxy/calc"
-	"math"
 	"strings"
 
 	"github.com/google/uuid"
@@ -208,11 +207,12 @@ func (sg ShipGroup) Speed(st *ShipType) float64 {
 
 // Мощность бомбардировки
 func (sg ShipGroup) BombingPower(st *ShipType) float64 {
-	return (math.Sqrt(st.Weapons.F()*sg.TechLevel(TechWeapons).F())/10. + 1.) *
-		st.Weapons.F() *
-		sg.TechLevel(TechWeapons).F() *
-		float64(st.Armament) *
-		float64(sg.Number)
+	return calc.BombingPower(
+		st.Weapons.F(),
+		sg.TechLevel(TechWeapons).F(),
+		float64(st.Armament),
+		float64(sg.Number),
+	)
 }
 
 func (sg ShipGroup) CargoString() string {