Environmental NeTworked Sensor I: Customizable dashboard, layouts, equations, export, registry.

This project makes the ENTS (DirtViz) dashboard easier to grow with real field use. A lot of the UI is still wired together by hand in React, which gets painful when new sensors show up or when people want different views of the same data. The plan is to expose what can actually be plotted using live database information, mainly from the sensor table, so the app lists available sensor names, measurements, and units per cell instead of maintaining long static lists in the frontend. Power and TEROS data may still live on older storage paths for a while, so the catalog will need a clear, documented way to bridge those sources until everything lines up on one model. The headline user feature is a drag and drop dashboard: reorder panels, add or remove them, and keep layout in the URL so someone can share a view with a link. Saving layouts on the server can come later, once the client side layout behavior is solid and easy to reason about. For people comparing multiple cells, the work should also make loads feel snappier by avoiding strictly one after another requests where batching or parallel loads make sense, and by ignoring out of date responses when the selection or date range changes mid flight. After that foundation, there is room for equations for derived metrics with tight server side validation, plus CSV export of what is already on screen. Fancy per panel styling is a lower priority and might stay minimal. Overall this is steady refactoring of the existing Flask and React stack, not a from scratch rewrite, so current APIs stay stable unless an extension is clearly worth it.