surface the new analysis caveats in the workbench

The backend now says when a result covers a different area than was drawn, or
when a score belongs to one confidence cut only. None of that helps an
operator while it stays in the response body.

- the raster selection adapters carry the model-coverage and widened-cell
  warnings into the map panel and mark the result an estimate when either
  applies, so an existing warning slot renders them;
- the map workspace shows the selection-edge disclosure next to the object
  count;
- the detection panel shows average precision and the F1-optimal threshold
  beside the single-threshold figures, and the box-versus-footprint
  interpretation when candidates are detector boxes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/lib/thematicRaster.ts

@@ -21,7 +21,10 @@ export function thematicRasterSelectionToMapSelection(result: ThematicRasterSele
       ...result.summary,
       feature_count: result.valid_cell_count,
       is_estimate: true,
-      warning: result.limitation_message,
+      // A selection finer than one source cell was widened to the cells it
+      // touches; the result then covers more ground than was drawn.
+      warning: [result.cell_selection_warning, result.limitation_message].filter(Boolean).join(' '),
+      selection_edge_warning: result.cell_selection_warning ?? null,
       metrics: result.summary.metrics.map((metric) => ({
         ...metric,
         is_estimate: metric.is_estimate ?? true,