Add web UI to edit and delete stored queries

Stored query pages now offer Edit and Delete actions in the query
actions menu, gated by the update-query and delete-query permissions.

- New QueryEditView (GET/POST at /<db>/<query>/-/edit) renders a
  pre-filled form for editing a query's title, description, SQL and
  privacy, reusing the create-query analysis UI. Changing the SQL still
  requires execute-sql; metadata-only edits do not.
- QueryDeleteView gains a GET confirmation page and HTML form POST that
  redirects to the query list, while keeping the existing JSON API.
- New default query_actions hook adds the Edit/Delete links for stored
  (non-config, non-trusted) queries the actor is allowed to manage.

Permission semantics (already enforced by default_query_permissions_sql)
are surfaced in the UI: owners can always edit/delete their queries;
non-private queries can be edited/deleted by any actor with the relevant
permission; private queries remain owner-only.

Shared the create-query form styles into _query_form_styles.html so the
edit form can reuse them.

https://claude.ai/code/session_019GU9g3pZAERukLKYNa4uAL

tests/test_docs.py

@@ -77,6 +77,7 @@ def documented_views():
             "QueryCreateAnalyzeView",
             "QueryDeleteView",
             "QueryDefinitionView",
+            "QueryEditView",
             "QueryListView",
             "QueryParametersView",
             "QueryStoreView",