mrtkp9993/fred-downloader ? reverse-engineered prompt

Build me a Java desktop app for FRED data that lets me search for economic time series, pick a series, download the data, and then view it in a simple table and chart. I want it to feel like a small Swing app I can run locally, with a clean way to enter my FRED API key from a config file and use it to pull data from the FRED API.

It should make it easy to inspect the series after downloading, and export the results to Excel. Please include the basic app flow, search, display, visualization, and export features, and make sure it runs with a modern Java version and Maven.

If you need to check any current FRED API details or Excel export approach, look up the current docs online first.