fix: reader UI fixes and correct Fedify API usage (v1.1.8→1.1.12)

- Fix Unknown authors by adding multi-strategy fallback chain in
  extractObjectData (getAttributedTo → actorFallback → attributionIds)
- Fix empty boosts from Lemmy/PieFed by checking content before storing
- Fix @mention/hashtag styling to stay inline instead of breaking layout
- Fix compose reply to show sanitized HTML blockquote instead of raw text
- Add default-checked syndication targets for AP and Bluesky
- Use authenticated document loader for all lookupObject calls
  (fixes 401 errors on servers requiring Authorized Fetch)
- Fix like handler 404 by using canonical AP uid for interactions
  instead of display URLs; add data-item-uid to card template
- Fix profile bio showing Nunjucks macro source code by renaming
  summary→bio to avoid collision with Indiekit's summary macro
- Fix Fedify API misuse in timeline-store.js: use instanceof Article
  (not string comparison), replyTargetId (not inReplyTo), getTags()
  and getAttachments() async methods (not sync property access)
- Fix inbox-listeners.js: use replyTargetId instead of non-existent
  getInReplyTo(), use instanceof Article for Update handler
- Add error logging to interaction catch blocks

assets/reader.css

@@ -296,24 +296,40 @@
   max-width: 100%;
 }
 
-/* @mentions — styled as subtle pills to distinguish from prose */
-.ap-card__content .h-card,
-.ap-card__content a.u-url.mention {
-  color: var(--color-on-offset);
-  font-size: var(--font-size-s);
-  text-decoration: none;
+/* @mentions — keep inline, style as subtle links */
+.ap-card__content .h-card {
+  display: inline;
 }
 
+.ap-card__content .h-card a,
+.ap-card__content a.u-url.mention {
+  display: inline;
+  color: var(--color-on-offset);
+  text-decoration: none;
+  white-space: nowrap;
+}
+
+.ap-card__content .h-card a span,
+.ap-card__content a.u-url.mention span {
+  display: inline;
+}
+
+.ap-card__content .h-card a:hover,
 .ap-card__content a.u-url.mention:hover {
   color: var(--color-primary);
   text-decoration: underline;
 }
 
-/* Hashtag mentions — subtle tag styling */
+/* Hashtag mentions — keep inline, subtle styling */
 .ap-card__content a.mention.hashtag {
+  display: inline;
   color: var(--color-on-offset);
-  font-size: var(--font-size-s);
   text-decoration: none;
+  white-space: nowrap;
+}
+
+.ap-card__content a.mention.hashtag span {
+  display: inline;
 }
 
 .ap-card__content a.mention.hashtag:hover {