Release 0.5.5: two feed bug fixes

Add a feed loads its Popular list again over Directory/Popular (#1); a site that
sends a message instead of a feed now says what it sent and flags the publisher (#2).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SZbKERNSt4vQfyGV8rvkqp

Cargo.lock

@@ -1605,7 +1605,7 @@ checksum = "791930b43c0d5973160d90a8f3894509f2b273430f5c5c73b668636d0287c5c0"
 
 [[package]]
 name = "ipx"
-version = "0.5.4"
+version = "0.5.5"
 dependencies = [
  "ammonia",
  "anyhow",