fix: remove trailing slashes causing FastAPI redirect → mixed-content

- workspaceUrl: no trailing slash on /{workspaceId} (backend route has none)
- deleteWorkspace: /workspaces/{id}?force= (was /{id}/?force= with slash before ?)

Quality gates: tsc --noEmit clean, pytest workspaces API (9 passed, 1 skipped)

apps/web/src/hooks/use-workspace-actions.ts

@@ -58,10 +58,7 @@ export function useWorkspaceActions(): UseWorkspaceActionsResult {
 	);
 
 	const deleteAction = useCallback(
-		async (
-			workspace: Workspace,
-			onRefresh: () => Promise<void>,
-		) => {
+		async (workspace: Workspace, onRefresh: () => Promise<void>) => {
 			setLoadingId(workspace.id);
 			try {
 				await deleteWorkspace(workspace.id);