chore: suppress dead_code warning on truncate_to_chars, fix test formatting

- types.rs: add #[allow(dead_code)] to truncate_to_chars now that
  data-layer truncation was removed in favor of flex-width rendering
- timeline_seed_tests.rs: reformat multi-line assert_eq for clarity
- ollama_mgmt.rs: collapse method chain formatting

src/timeline/timeline_seed_tests.rs

@@ -288,7 +288,11 @@ fn test_seed_evidence_snippet_truncated() {
         if let TimelineEventType::NoteEvidence { snippet, .. } =
             &result.evidence_notes[0].event_type
         {
-            assert_eq!(snippet.chars().count(), 500, "snippet should preserve full body text");
+            assert_eq!(
+                snippet.chars().count(),
+                500,
+                "snippet should preserve full body text"
+            );
         } else {
             panic!("Expected NoteEvidence");
         }