fix: v0.9.4 inbox badge clears when seen

Opening the bell marks its events seen; viewing a session (or returning
to the tab) reads that session's events. The badge now drops to what is
live instead of climbing with every background "finished". Closes #42

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHRLCCdXYm41Qx5kNhehaP

debian/changelog

@@ -1,3 +1,12 @@
+devdesk (0.9.4) bookworm; urgency=medium
+
+  * The inbox badge no longer only grows (#42). Opening the bell marks its
+    events seen, leaving just what is live (sessions waiting on you,
+    firing alerts). Viewing a session reads the events it reported while
+    you were away.
+
+ -- Jared Vititoe <jjvititoe1@gmail.com>  Sun, 11 Oct 2026 22:46:00 -0400
+
 devdesk (0.9.3) bookworm; urgency=medium
 
   * Claude's footer shows 5-hour plan use instead of a dollar figure on a