Name session checkpoints by their session title

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/app/generation.rs

@@ -552,8 +552,7 @@ impl App {
         false
     }
 
-    #[cfg(target_os = "macos")]
-    fn session_title(&self, session_id: i32) -> Option<String> {
+    pub(super) fn session_title(&self, session_id: i32) -> Option<String> {
         self.projects
             .iter()
             .flat_map(|project| &project.sessions)

src/app/view/stats.rs

@@ -417,9 +417,16 @@ impl App {
         let mut rows = column![].spacing(7);
         for entry in &usage.entries {
             let path = entry.path.clone();
+            let label = entry
+                .session
+                .and_then(|id| self.session_title(id))
+                .map_or_else(
+                    || entry.name.clone(),
+                    |title| format!("{}: {}", entry.name, shorten(&title)),
+                );
             rows = rows.push(
                 row![
-                    text(entry.name.clone()).size(12),
+                    text(label).size(12),
                     Space::with_width(Length::Fill),
                     text(format!(
                         "{} · {} old",
@@ -499,6 +506,15 @@ const AGE_COLORS: [Color; 5] = [
     Color::from_rgb(0.45, 0.45, 0.48),
 ];
 
+/// Keeps a long session title from crowding out the size and the action.
+fn shorten(title: &str) -> String {
+    const LIMIT: usize = 44;
+    if title.chars().count() <= LIMIT {
+        return title.to_owned();
+    }
+    title.chars().take(LIMIT - 1).chain(['…']).collect()
+}
+
 fn portion(bytes: u64, capacity: u64) -> u16 {
     ((bytes.saturating_mul(1000) / capacity.max(1)) as u16).max(1)
 }

src/metrics.rs

@@ -694,6 +694,8 @@ const CACHE_ENTRY_ROWS: usize = 12;
 pub(crate) struct KvCacheEntry {
     pub(crate) path: PathBuf,
     pub(crate) name: String,
+    /// Set for session checkpoints, so the view can name the conversation.
+    pub(crate) session: Option<i32>,
     pub(crate) bytes: u64,
     pub(crate) age_seconds: u64,
 }
@@ -762,6 +764,10 @@ pub(crate) fn kv_cache_report(root: &Path, budget_bytes: u64) -> KvCacheReport {
             }
             report.entries.push(KvCacheEntry {
                 name: entry_name(&path, transient),
+                session: (!transient)
+                    .then(|| path.file_stem().and_then(|value| value.to_str()))
+                    .flatten()
+                    .and_then(|stem| stem.parse().ok()),
                 bytes: bytes.saturating_add(
                     fs::metadata(path.with_extension("meta")).map_or(0, |index| index.len()),
                 ),
@@ -924,6 +930,9 @@ mod tests {
         assert_eq!(report.entries.len(), 2);
         assert_eq!(report.entries[0].bytes, 140);
         assert_eq!(report.entries[1].name, "Session 7");
+        // The session id survives on the row, so the view can add its title.
+        assert_eq!(report.entries[1].session, Some(7));
+        assert_eq!(report.entries[0].session, None);
 
         fs::remove_dir_all(root).unwrap();
     }