semantic markup update

frontend/src/components/MappingTable.svelte

@@ -25,6 +25,8 @@
   // [DEF:updateMapping:Function]
   /**
    * @purpose Updates a mapping for a specific source database.
+   * @pre sourceUuid and targetUuid are provided.
+   * @post 'update' event is dispatched.
    */
   function updateMapping(sourceUuid: string, targetUuid: string) {
     dispatch('update', { sourceUuid, targetUuid });
@@ -34,6 +36,8 @@
   // [DEF:getSuggestion:Function]
   /**
    * @purpose Finds a suggestion for a source database.
+   * @pre sourceUuid is provided.
+   * @post Returns matching suggestion object or undefined.
    */
   function getSuggestion(sourceUuid: string) {
     return suggestions.find(s => s.source_db_uuid === sourceUuid);