Fix workspace store persistence rehydration

[DovOps]

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Summary

Fixes Sail workspace-store persistence and rehydration for the v3 beta branch.

This change preserves the in-memory Map shape used by the workspace store while making persisted storage round-trip correctly through JSON. It also supports seeded workspace state for demo/test environments without losing the Map-backed runtime API.

This came out of the TraderX state 014 FDC3 v3/Sail integration work, where the visible Sail layout could be serialized from memory but localStorage.getItem("workspace-store") only showed an empty object for workspaces.

Related Tracking

• Implementers feedback issue: Workspace persistence serializes Maps as empty objects and lacks a supported default workspace profile hook #313
• TraderX integration PR: Add FDC3 v3 Sail demo state traderX#432

Validation

• npm run test:run -w @finos/sail-web -- workspace-store