fix(voyager): refetch Related Entities sub-graph when main graph re-renders

[allmonday]

Problem

The Related Entities sub-graph (spec 005) was not following display-option changes. Toggling any of:

• Hide Reverse Relationships (PR feat(voyager): add Hide Reverse Relationships toggle for ER diagram #99)
• Brief Mode
• Better Cluster Display
• Show Methods
• Show Module Cluster
• Pydantic Resolve Meta
• Edge Minlen

…re-rendered the main ER diagram but left the sub-graph showing the previous config's edges. The Pure FK toggle made this most visible (missing edges are obvious), but the bug affected every display toggle since spec 005 introduced the sub-graph.

Root cause

• vue-main.js::onGenerate only dispatches to renderErDiagram (main graph) — it never touches the sub-graph.
• store.js::fetchRelatedEntities has a dedup guard (spec 005 FR-011, anti-rapid-click) that returns early when selectedSchema === schemaName and the previous dot still exists.
• So any re-render of the main graph with a new config leaves the sub-graph stuck on stale data.

Fix

In renderErDiagram, after the main graph renders, if a sub-graph is currently open (selectedSchema non-empty and dot present):

1. Clear selectedSchema to defeat the dedup guard.
2. Call fetchRelatedEntities(openSubSchema) — buildErDiagramSubgraphPayload already threads every display option (cluster display / brief / show methods / hide reverse / etc.) into the request body.

The sub-graph re-renders with the new config, matching the main graph.

Spec 005 FR-011's anti-rapid-click dedup is preserved — the guard still fires when the same entity is clicked twice in quick succession while no config has changed.

Test plan

• Manual (no frontend test baseline):
  1. uv run uvicorn demo.enterprise_voyager.voyager_demo:app --port 8010
  2. Open ER diagram → double-click an entity with a back_populates relationship (e.g. Post↔User).
  3. Open the Related Entities tab in the sidebar.
  4. Toggle Hide Reverse Relationships.
  5. Confirm sub-graph re-renders with ONETOMANY reverse edges hidden, matching the main graph.
  6. Repeat for Brief Mode and Show Module Cluster to confirm the fix benefits all toggles.
• Confirm rapid double-clicking the same entity still hits the dedup (no duplicate requests).

Regression risk

Low — single 12-line addition in renderErDiagram. No data-structure or contract changes. Spec 005 FR-011 dedup still active in the same scenarios as before.

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