Pinned posts on profiles, and pinning from the card

A profile shows the posts the account pins above its posts (pinned=true: for an account elsewhere, what it features,
which PrivaPub now keeps); the persona pins and unpins its own public and unlisted posts from the card's menu, and
PrivaPub tells its followers. tests/e2e/Actions/PinTests.cs pins from the card and finds the post first on the profile;
the whole e2e suite passes against the reseeded village (122, 4 skipped).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Resources/AllStrings.resx

@@ -1718,4 +1718,13 @@
   <data name="{0} has moved to" xml:space="preserve">
     <value>{0} has moved to</value>
   </data>
+  <data name="Pinned" xml:space="preserve">
+    <value>Pinned</value>
+  </data>
+  <data name="Pin on profile" xml:space="preserve">
+    <value>Pin on profile</value>
+  </data>
+  <data name="Unpin from profile" xml:space="preserve">
+    <value>Unpin from profile</value>
+  </data>
 </root>