FEATURE - Migrate ADP preview to UShell Sandbox 2.0 for UI5 >= 1.151

[nikmace]

As an ADP developer,
I want to use the new UShell Sandbox 2.0 for ADP preview on UI5 >= 1.151,
so that I benefit from the stable, officially recommended UShell bootstrap API and avoid issues inherent to the legacy sandbox

Description

The UShell team has released a new public and stable Sandbox 2.0 and recommends migrating away from the old internal sandbox. Fiori Tools has already completed this migration (#4615). ADP preview in preview-middleware should follow the same migration for UI5 versions >= 1.151, aligning with the recommended UShell bootstrap API and staying consistent with the Fiori Tools implementation.

The legacy sandbox relies on sap-ushell-config for configuration, which the UShell team considers an internal API. Sandbox 2.0 uses fioriSandboxAppConfig.json as its configuration contract, which is the stable public API going forward.

Reference: https://ui5.sap.com/#/topic/e6151c12b51649dbb873802861d2a06c

Technical Design

• preview-middleware: enable sandbox 2.0 for ADP projects when UI5 version >= 1.151, consistent with how shouldUseSandbox2 / qualifiesForNewSandbox already works for non-ADP projects
• Verify that ADP-specific configuration (flex connectors, RTA layer, editor routes) is correctly carried over to the sandbox 2.0 bootstrap and fioriSandboxAppConfig.json
• Ensure the UI2 personalization fix (appVariantStorage: { enabled: false }) is applied in the sandbox 2.0 config path as well

Acceptance Criteria

Given I have an ADP project with UI5 version >= 1.151,
when I run npm run start,
then the preview uses Sandbox 2.0 and all ADP features (RTA, flex changes, personalization) work correctly.

Notes

Recommended by the UShell team (Aaron Bruch) in response to SAP case 576244/2026. Fiori Tools reference migration: #4615.

Tasks

• Enable sandbox 2.0 for ADP preview on UI5 >= 1.151
• Verify ADP-specific config carries over correctly to sandbox 2.0
• Apply UI2 personalization fix in sandbox 2.0 config path
• Unit Tests added
• Test Cases defined