Optimize topology canvas per the 2026-10-12 plan.

Save path: one atomic POST /views/{id}/commit (edges, ports, styles, node
add/remove, positions) replaces the multi-request save. Edge styles and
manual-edge port edits now go through dirty/undo/save instead of writing
immediately; non-manual edge ports are read-only.

Data safety: UI saves no longer clear MCP node locks or freeze the device
name into the placement label (label_override + omit-means-keep semantics,
also applied to the MCP positions tool). Adding NEs/neighbors with unsaved
edits now saves first instead of silently dropping them. Positions no longer
bypass membership caps, except persisting synthesized child-region icons.

Fixes found in acceptance: nodes added in the same commit kept (40,40)
under autoflush=False; edits on edges deleted in the same save 404'd the
whole save; box-selection drags and arrow-key moves were not marked dirty;
large canvases far from the origin opened blank and locate did nothing
because fitView waits for measurement that onlyRenderVisibleElements never
does (now fitBounds from known geometry).

Also: batch N+1 lookups in graph/positions, deterministic truncation,
outside-peer scan excludes internal edges, split TopologyPage into hooks,
fix flaky UME/LLDP port test, add scripts/topology_clear_frozen_labels.py.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netx_api/topology_views.py

@@ -1,6 +1,7 @@
 """Topology folder tree and leaf view operations (facade)."""
 from __future__ import annotations
 
+from .topology_views_commit import commit_view_changes, patch_manual_edge_ports
 from .topology_views_graph import (
     _place_fabric_ids_on_view,
     add_nodes_to_view,
@@ -29,6 +30,7 @@ __all__ = [
     "_place_fabric_ids_on_view",
     "add_nodes_to_view",
     "bootstrap_topology_tree",
+    "commit_view_changes",
     "create_folder",
     "create_topology_placeholder_on_view",
     "create_view",
@@ -38,6 +40,7 @@ __all__ = [
     "get_topology_tree",
     "get_view_graph",
     "list_views",
+    "patch_manual_edge_ports",
     "patch_view_edge_style",
     "patch_view_positions",
     "populate_view",