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/snapshot_support.rs

@@ -13,6 +13,8 @@ pub struct ProjectionSnapshotSpec<'a> {
     pub workspace_id: &'a str,
     pub root_node_id: Option<&'a str>,
     pub depth: Option<u32>,
+    pub query: Option<&'a str>,
+    pub max_results: Option<usize>,
     pub projection: KernelProjectionKind,
 }
 
@@ -53,6 +55,8 @@ pub fn projection_query(spec: &ProjectionSnapshotSpec<'_>) -> RuntimeQueryEnvelo
             "workspaceId": spec.workspace_id,
             "rootNodeId": spec.root_node_id,
             "depth": spec.depth,
+            "query": spec.query,
+            "maxResults": spec.max_results,
             "includeEdges": true,
             "includeContent": false,
             "nodeTypes": [KernelNodeType::Page],