Make HTML annotations render HTML by default

* feat(annotate): render html files by default

* fix(annotate): support raw html assets and sharing

* fix(annotate): address html first review followups

* fix(editor): avoid raw html sidebar init crash

* fix(annotate): support portable html shares

* fix(annotate): harden html share support

* fix(share): clear attachments when loading shared payloads

* fix(share): warn on remote share link failures

* perf(annotate): lazy-build html share payloads

* test(annotate): guard lazy html share generation

* test(annotate): drop flaky html share server test

packages/server/package.json

@@ -21,7 +21,8 @@
     "./share-url": "./share-url.ts",
     "./sessions": "./sessions.ts",
     "./project": "./project.ts",
-    "./pr": "./pr.ts"
+    "./pr": "./pr.ts",
+    "./html-assets": "./html-assets.ts"
   },
   "files": [
     "*.ts"