Pass area names to the file tools, not resolved areas

list_dir and fetch take a name and resolve it themselves; the tools layer
resolved it first and handed over the object, so every call failed with
'No FTP area named Area(...)'. Found by calling the tool for real.

src/mcbebop/tools/files.py

@@ -47,7 +47,7 @@ def register(mcp: FastMCP, settings: Settings) -> None:
         through this tool.
         """
         host = _host(settings)
-        entries = await asyncio.to_thread(ftp.list_dir, ftp.resolve_area(area), path, host=host)
+        entries = await asyncio.to_thread(ftp.list_dir, area, path, host=host)
         return [FileEntry(name=e.name, size=e.size, is_dir=e.is_dir) for e in entries]
 
     @mcp.tool(annotations={"readOnlyHint": True, "openWorldHint": True})
@@ -61,7 +61,7 @@ def register(mcp: FastMCP, settings: Settings) -> None:
         host = _host(settings)
         dest = await asyncio.to_thread(
             ftp.fetch,
-            ftp.resolve_area(area),
+            area,
             path,
             host=host,
             capture_dir=settings.capture_dir,