SERP Settings Sync: Return noNativeSettings on first launch

[mikescamell]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1207908166761516/task/1212402385991388?focus=true

Description

When SERP Settings Sync is enabled and a user launches the app for the first time (or migrates), the getNativeSettings handler now returns { noNativeSettings: true } instead of an empty JSON object. This signals to the SERP that this is a first launch/migration scenario, allowing the SERP to handle the initial state appropriately.

This is returned until the FE calls the updateNativeSettings and updates the locally stored serp settings.

Steps to test this PR

See testing steps

UI changes

N/A

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Note

getNativeSettings now returns { noNativeSettings: true } until settings are stored, otherwise returns the stored JSON.

• SERP Settings Sync
  • Update GetNativeSettingsHandler to return { "noNativeSettings": true } when no settings are stored; otherwise parse and return stored JSON.
  • Add KEY_NO_NATIVE_SETTINGS constant.
• Tests
  • Adjust expectations to noNativeSettings: true for null settings and treat "{}" as an empty object.
  • Add test verifying the flag is returned until settings are persisted, then actual values are returned.
  • Keep id-handling behavior (no response when id is null, response when present).

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