fix(schema-diff): require explicit expression index provenance

apps/desktop/src/types/database.ts

@@ -566,6 +566,8 @@ export interface IndexInfo {
   index_type?: string | null;
   included_columns?: string[] | null;
   comment?: string | null;
+  /** Parallel to `columns`: true at index i means columns[i] is a raw expression, not a plain column name. */
+  key_is_expression?: boolean[] | null;
 }
 
 export interface ForeignKeyInfo {