Improve tracker source and first-party cleanup

Surface every CookieSource value in the console: the trackers page
filter was missing the HTTP option and the source badge helper had no
EXTENSION case, so HTTP-sourced rows could not be filtered and
extension-sourced rows rendered the raw enum string.

On the backend, the mark-first-party verdict now blanks the stale
description on both the catalog row and its uncategorised org tracker
patterns. A terminal non-third-party row keeps no vendor link, so a
description naming the (now-cleared) vendor would be misleading; the
mapping worker only copies descriptions into empty rows and never
clears them, so clearing is done explicitly here.

Signed-off-by: Émile Ré <emile@probo.com>

packages/helpers/src/tracker.ts

@@ -43,6 +43,7 @@ export function getTrackerSourceBadge(source: string, __: Translator): Badge {
     case "SCRIPT": return { label: __("Script"), variant: "info" };
     case "PRE_EXISTING": return { label: __("Pre-existing"), variant: "outline" };
     case "HTTP": return { label: __("HTTP"), variant: "neutral" };
+    case "EXTENSION": return { label: __("Extension"), variant: "warning" };
     default: return { label: source, variant: "neutral" };
   }
 }