cookiebanner: detect service workers and Cache Storage buckets

A registered service worker is a URL-shaped artifact (origin+path of
the worker script), so it goes in tracker_resources as a new
SERVICE_WORKER resource type. A Cache Storage bucket is an opaque
named string with no URL, so it goes in detected_trackers as a new
CACHE_STORAGE tracker type.

Frontend:
  - StorageDetector wraps caches.open() and enumerates caches.keys()
    on start to surface pre-existing buckets that pre-date the SDK
    load (service workers commonly populate caches eagerly on
    install).
  - ThirdPartyDetector wraps navigator.serviceWorker.register() and
    enumerates getRegistrations() on start.

Both wrappers degrade silently on insecure contexts where these APIs
are unavailable.

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

pkg/coredata/migrations/20260511T064746Z.sql

@@ -0,0 +1,21 @@
+-- Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+-- A registered service worker is a URL-shaped artifact, so it lives
+-- in tracker_resources alongside scripts/iframes.
+ALTER TYPE tracker_resource_type ADD VALUE IF NOT EXISTS 'SERVICE_WORKER';
+
+-- A Cache Storage bucket is just a named string identifier with no
+-- URL, so it lives in detected_trackers like the other storage types.
+ALTER TYPE tracker_type ADD VALUE IF NOT EXISTS 'CACHE_STORAGE';