ui/phase-20: ship-group inspector actions

Eight ship-group operations land on the inspector behind a single
inline-form panel: split, send, load, unload, modernize, dismantle,
transfer, join fleet. Each action either appends a typed command to
the local order draft or surfaces a tooltip explaining the
disabled state. Partial-ship operations emit an implicit
breakShipGroup command before the targeted action so the engine
sees a clean (Break, Action) pair on the wire.

`pkg/calc.BlockUpgradeCost` migrates from
`game/internal/controller/ship_group_upgrade.go` so the calc
bridge can wrap a pure pkg/calc formula; the controller now
imports it. The bridge surfaces the function as
`core.blockUpgradeCost`, which the inspector calls once per ship
block to render the modernize cost preview.

`GameReport.otherRaces` is decoded from the report's player block
(non-extinct, ≠ self) and feeds the transfer-to-race picker. The
planet inspector's stationed-ship rows become clickable for own
groups so the actions panel is reachable from the standard click
flow (the renderer continues to hide on-planet groups).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/frontend/src/platform/core/index.ts

@@ -73,6 +73,12 @@ export interface CarryingMassInput {
 	cargoTech: number;
 }
 
+export interface BlockUpgradeCostInput {
+	blockMass: number;
+	currentTech: number;
+	targetTech: number;
+}
+
 export interface Core {
 	/**
 	 * signRequest returns the canonical signing input bytes for a v1
@@ -157,6 +163,17 @@ export interface Core {
 	 * cargoCapacity.
 	 */
 	carryingMass(input: CarryingMassInput): number;
+
+	/**
+	 * blockUpgradeCost wraps `pkg/calc/ship.go.BlockUpgradeCost`:
+	 * production cost of moving one ship block from currentTech to
+	 * targetTech, scaled by the block mass and a constant 10. Returns
+	 * 0 when blockMass is zero or targetTech is not above currentTech.
+	 * Phase 20's ship-group inspector calls this once per block
+	 * (drive, weapons, shields, cargo) to render the modernize cost
+	 * preview.
+	 */
+	blockUpgradeCost(input: BlockUpgradeCostInput): number;
 }
 
 export type CoreLoader = () => Promise<Core>;

ui/frontend/src/platform/core/wasm.ts

@@ -9,6 +9,7 @@
 // served from `static/core.wasm`.
 
 import type {
+	BlockUpgradeCostInput,
 	CargoCapacityInput,
 	CarryingMassInput,
 	Core,
@@ -50,6 +51,7 @@ interface GalaxyCoreBridge {
 	speed(input: SpeedInput): number;
 	cargoCapacity(input: CargoCapacityInput): number;
 	carryingMass(input: CarryingMassInput): number;
+	blockUpgradeCost(input: BlockUpgradeCostInput): number;
 }
 
 interface BridgeRequestFields {
@@ -210,6 +212,9 @@ export function adaptBridge(bridge: GalaxyCoreBridge): Core {
 		carryingMass(input: CarryingMassInput): number {
 			return bridge.carryingMass(input);
 		},
+		blockUpgradeCost(input: BlockUpgradeCostInput): number {
+			return bridge.blockUpgradeCost(input);
+		},
 	};
 }