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/lib/inspectors/ship-group.svelte

@@ -12,12 +12,15 @@ variant — for Phase 19 the inspector is intentionally read-only.
 <script lang="ts">
 	import type {
 		ReportIncomingShipGroup,
+		ReportLocalFleet,
 		ReportLocalShipGroup,
 		ReportOtherShipGroup,
 		ReportPlanet,
 		ReportUnidentifiedShipGroup,
+		ShipClassSummary,
 	} from "../../api/game-state";
 	import { i18n, type TranslationKey } from "$lib/i18n/index.svelte";
+	import Actions from "./ship-group/actions.svelte";
 
 	export type ShipGroupSelection =
 		| { variant: "local"; group: ReportLocalShipGroup }
@@ -28,8 +31,29 @@ variant — for Phase 19 the inspector is intentionally read-only.
 	type Props = {
 		selection: ShipGroupSelection;
 		planets: ReportPlanet[];
+		localShipClass?: ShipClassSummary[];
+		localFleets?: ReportLocalFleet[];
+		otherRaces?: string[];
+		mapWidth?: number;
+		mapHeight?: number;
+		localPlayerDrive?: number;
+		localPlayerWeapons?: number;
+		localPlayerShields?: number;
+		localPlayerCargo?: number;
 	};
-	let { selection, planets }: Props = $props();
+	let {
+		selection,
+		planets,
+		localShipClass = [],
+		localFleets = [],
+		otherRaces = [],
+		mapWidth = 1,
+		mapHeight = 1,
+		localPlayerDrive = 0,
+		localPlayerWeapons = 0,
+		localPlayerShields = 0,
+		localPlayerCargo = 0,
+	}: Props = $props();
 
 	const kindKeyMap: Record<ShipGroupSelection["variant"], TranslationKey> = {
 		local: "game.inspector.ship_group.kind.local",
@@ -86,6 +110,22 @@ variant — for Phase 19 the inspector is intentionally read-only.
 		{/if}
 	</header>
 
+	{#if selection.variant === "local"}
+		<Actions
+			group={selection.group}
+			{planets}
+			{localShipClass}
+			{localFleets}
+			{otherRaces}
+			{mapWidth}
+			{mapHeight}
+			{localPlayerDrive}
+			{localPlayerWeapons}
+			{localPlayerShields}
+			{localPlayerCargo}
+		/>
+	{/if}
+
 	{#if selection.variant === "local" || selection.variant === "other"}
 		{@const g = selection.group}
 		{@const onPlanet = g.origin === null || g.range === null}