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/routes/games/[id]/+layout.svelte

@@ -180,12 +180,27 @@ fresh.
 	const inspectorLocalDrive = $derived(
 		renderedReport.report?.localPlayerDrive ?? 0,
 	);
+	const inspectorLocalWeapons = $derived(
+		renderedReport.report?.localPlayerWeapons ?? 0,
+	);
+	const inspectorLocalShields = $derived(
+		renderedReport.report?.localPlayerShields ?? 0,
+	);
+	const inspectorLocalCargo = $derived(
+		renderedReport.report?.localPlayerCargo ?? 0,
+	);
 	const inspectorLocalShipGroups = $derived(
 		renderedReport.report?.localShipGroups ?? [],
 	);
 	const inspectorOtherShipGroups = $derived(
 		renderedReport.report?.otherShipGroups ?? [],
 	);
+	const inspectorLocalFleets = $derived(
+		renderedReport.report?.localFleets ?? [],
+	);
+	const inspectorOtherRaces = $derived(
+		renderedReport.report?.otherRaces ?? [],
+	);
 	const inspectorLocalRace = $derived(renderedReport.report?.race ?? "");
 
 	// Reveal the inspector whenever a new planet selection lands.
@@ -340,6 +355,15 @@ fresh.
 	<ShipGroupSheet
 		selection={selectedShipGroup}
 		planets={inspectorPlanets}
+		{localShipClass}
+		localFleets={inspectorLocalFleets}
+		otherRaces={inspectorOtherRaces}
+		mapWidth={inspectorMapWidth}
+		mapHeight={inspectorMapHeight}
+		localPlayerDrive={inspectorLocalDrive}
+		localPlayerWeapons={inspectorLocalWeapons}
+		localPlayerShields={inspectorLocalShields}
+		localPlayerCargo={inspectorLocalCargo}
 		onMap={effectiveTool === "map"}
 		onClose={() => selection.clear()}
 	/>