feat: continue tree rust family cutover

- add rust renderer/state-family scaffolds and inline compat host thinning for page tree, file tree, and picker
- route tree/filetree preflight, file projection, resource artifact, and stream delta contracts through rust plans
- preserve canonical move-order validation, file-tree search projection, and related frontend/runtime regression coverage

rust/crates/mnote-web/src/routes/sse.rs

@@ -78,7 +78,9 @@ pub async fn events(
                             &workspace_id,
                             &overview,
                             change.cursor,
-                            change.delta.unwrap_or_else(|| serde_json::json!({ "op": "noop" })),
+                            change
+                                .delta
+                                .unwrap_or_else(|| serde_json::json!({ "op": "noop" })),
                         );
                         return Some((Ok(stream_event("delta", &payload)), Some(state)));
                     }
@@ -95,8 +97,7 @@ pub async fn events(
                             return None;
                         };
                         state.query = next_query;
-                        state.current_cursor =
-                            read_stream_cursor_from_payload(&snapshot_payload);
+                        state.current_cursor = read_stream_cursor_from_payload(&snapshot_payload);
                         return Some((
                             Ok(stream_event(
                                 "resync",