Name session checkpoints by their session title

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

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();
     }