Fase B8+B9: stateful code kernel and live notes bound to external URLs

B8 - executable code blocks with a real kernel:
- worker/handler/kernel.cljs: one persistent SCI interpreter session per
  page, reused across block evaluations so defs/state survive between runs.
  Deliberately scoped to the same privileges the existing client-side
  single-shot evaluator already had (no shell/fs access, no call-api).
- Run button + result display wired into block.cljs's code-block UI.
- New :logseq.property.code/result and /executed-at properties (65.38).

B9 - live notes: pages tagged #LiveNote that fetch external content on a
refresh schedule and render it via the render-resource pipeline:
- worker/handler/live_notes.cljs: per-block credential storage, scheduled
  refresh (Node-only), thread-apis for manual refresh and auth.
- worker/handler/render_resource/live_note.cljs: reads back fetched content,
  watching [:entity block-uuid] for reactive invalidation.
- New :logseq.class/LiveNote + :logseq.property.livenote/* properties (65.39).

Bugs found and fixed along the way while actually exercising page creation
through page-handler/create! for the first time in a test (previously only
pure-fn tests existed for CalDAV/Event/Contact):
- logseq-property-namespaces (property.cljs) was missing the citation/event/
  contact/caldav/livenote namespaces, causing auto-create-ontology to treat
  already-built-in properties as new user idents.
- outliner/page.cljs's build-page-tx always added the generic #Page tag even
  when the caller tagged with a built-in class that extends #Page, which
  malli-schema rejects as conflicting; it also lost the property type when
  building ref-typed property values for new pages, breaking non-:default
  types like :number.
- entity-util/page? never recognized Event/Contact/LiveNote as pages (only
  Journal/Whiteboard/Tag/Property/Page had dedicated recognition), so pages
  tagged with those classes alone weren't treated as pages anywhere in the
  app; added built-in-page-child? alongside the existing per-class checks.
- caldav.cljs's upsert-page! passed a bare keyword as a tag where an entity
  was required, and two error logs passed raw error objects to glogi that
  triggered runaway recursion in this test environment; both fixed.

src/main/frontend/worker/handler/render_resource/engine.cljs

@@ -4,6 +4,7 @@
             [frontend.worker.handler.block :as block-handler]
             [frontend.worker.handler.render-resource.basic :as basic]
             [frontend.worker.handler.render-resource.common :as common]
+            [frontend.worker.handler.render-resource.live-note :as live-note]
             [frontend.worker.handler.render-resource.property :as property]
             [frontend.worker.handler.render-resource.query :as query]
             [frontend.worker.handler.render-resource.similar :as similar]
@@ -16,6 +17,7 @@
          view/resource-renderers
          query/resource-renderers
          similar/resource-renderers
+         live-note/resource-renderers
          {:block-sync-conflicts
           (common/renderer nil
                            (fn [_db resource-key _runtime]