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/sidebar/inspector-tab.svelte

@@ -89,12 +89,23 @@ from the Phase 10 stub.
 	const localPlayerDrive = $derived(
 		renderedReport?.report?.localPlayerDrive ?? 0,
 	);
+	const localPlayerWeapons = $derived(
+		renderedReport?.report?.localPlayerWeapons ?? 0,
+	);
+	const localPlayerShields = $derived(
+		renderedReport?.report?.localPlayerShields ?? 0,
+	);
+	const localPlayerCargo = $derived(
+		renderedReport?.report?.localPlayerCargo ?? 0,
+	);
 	const localShipGroups = $derived(
 		renderedReport?.report?.localShipGroups ?? [],
 	);
 	const otherShipGroups = $derived(
 		renderedReport?.report?.otherShipGroups ?? [],
 	);
+	const localFleets = $derived(renderedReport?.report?.localFleets ?? []);
+	const otherRaces = $derived(renderedReport?.report?.otherRaces ?? []);
 	const localRace = $derived(renderedReport?.report?.race ?? "");
 </script>
 
@@ -113,7 +124,19 @@ from the Phase 10 stub.
 			{localRace}
 		/>
 	{:else if selectedShipGroup !== null}
-		<ShipGroup selection={selectedShipGroup} planets={allPlanets} />
+		<ShipGroup
+			selection={selectedShipGroup}
+			planets={allPlanets}
+			{localShipClass}
+			{localFleets}
+			{otherRaces}
+			{mapWidth}
+			{mapHeight}
+			{localPlayerDrive}
+			{localPlayerWeapons}
+			{localPlayerShields}
+			{localPlayerCargo}
+		/>
 	{:else}
 		<h3>{i18n.t("game.sidebar.tab.inspector")}</h3>
 		<p>{i18n.t("game.sidebar.empty.inspector")}</p>