Render unknown event kinds with a NIP-31 alt-tag fallback

Previously, any kind not explicitly handled by NoteCard or
PostDetailContent fell through to the kind-1 text-note renderer, which
ran the URL/hashtag/nostr: tokenizer over arbitrary content — broken
for events whose content is JSON or empty.

Add an UnknownKindContent component that displays the NIP-31 'alt' tag
(falling back to title/name/summary/d) in a rounded card, or a dashed
'This event kind is not supported' tombstone when the event carries no
fallback text. Route to it from both dispatchers when the kind isn't
1, 11, or 1111.

Extend the same handling to embedded quote previews (EmbeddedNote,
EmbeddedNaddr, AddressableEventPreview) so reply-context hover cards,
compose previews, more-menu previews, notification references, and
inline nostr: mentions all display unknown kinds consistently instead
of feeding JSON or arbitrary content to the kind-1 tokenizer.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "ditto",
-  "version": "2.10.5",
+  "version": "2.11.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "ditto",
-      "version": "2.10.5",
+      "version": "2.11.0",
       "dependencies": {
         "@capacitor/app": "^8.0.0",
         "@capacitor/core": "^8.1.0",