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>

web/src/i18n/locales/en/topology.ts

@@ -115,9 +115,12 @@ const topology = {
   save: "Save",
   saveDirty: "Save *",
   unsavedConfirm: "You have unsaved changes. Discard and switch maps?",
+  unsavedSaveBeforeAdd: "You have unsaved changes. Save and continue adding?",
   saving: "Saving…",
   saved: "Topology saved",
+  savedLockedSkipped: "Topology saved ({{count}} locked node(s) skipped)",
   saveFailed: "Save failed: {{detail}}",
+  renameNodeClearHint: "Leave empty to follow the device name",
   readOnlyBanner: "Read-only (ne:write scope required to edit)",
   readOnlyHint: "Read-only — no write permission",
   discoverTimeout: "Discovery timed out; check LLDP tasks for progress",

web/src/i18n/locales/zh/topology.ts

@@ -112,9 +112,12 @@ const topology = {
   save: "保存",
   saveDirty: "保存 *",
   unsavedConfirm: "有未保存的更改，确定丢弃并切换吗？",
+  unsavedSaveBeforeAdd: "当前有未保存修改，保存后继续添加？",
   saving: "保存中…",
   saved: "拓扑已保存",
+  savedLockedSkipped: "拓扑已保存（{{count}} 个锁定节点未移动）",
   saveFailed: "保存失败：{{detail}}",
+  renameNodeClearHint: "留空则恢复跟随设备名",
   readOnlyBanner: "只读模式（需要 ne:write 权限才能编辑）",
   readOnlyHint: "只读模式，无编辑权限",
   discoverTimeout: "发现任务超时，请稍后在 LLDP 任务页查看进度",