fix unread count: sent messages don't count as unread

Track outgoing messages separately (own counter) so they appear
in the log but don't inflate unread counts. Reset on recv.

Co-Developed-By: Kent Overstreet <kent.overstreet@linux.dev>

src/thalamus/channel_log.rs

@@ -12,6 +12,8 @@ pub struct ChannelLog {
     messages: VecDeque<String>,
     consumed: usize,
     total: usize,
+    /// Messages we sent (don't count as unread)
+    own: usize,
 }
 
 impl ChannelLog {
@@ -20,6 +22,7 @@ impl ChannelLog {
             messages: VecDeque::with_capacity(DEFAULT_CAPACITY),
             consumed: 0,
             total: 0,
+            own: 0,
         }
     }
 
@@ -35,7 +38,13 @@ impl ChannelLog {
     }
 
     pub fn unread(&self) -> u32 {
-        (self.total - self.consumed) as u32
+        (self.total - self.consumed - self.own) as u32
+    }
+
+    /// Push a message that we sent (doesn't count as unread).
+    pub fn push_own(&mut self, line: String) {
+        self.push(line);
+        self.own += 1;
     }
 
     /// Return all unconsumed messages (marks consumed), plus scrollback
@@ -58,6 +67,7 @@ impl ChannelLog {
             .collect();
 
         self.consumed = self.total;
+        self.own = 0;
 
         let mut result = scrollback;
         result.extend(new_msgs);