Unblock iOS CI build by fixing sample data extensions

[Copilot]

The iOS CI build failed with Swift compiler errors in Location+Test.swift and missing sample symbols used by ContentView, causing the workflow to exit with code 65.

• Sample data definitions
  • Fix extension nesting and add the missing Location sample entries referenced in the UI.
• Auth token constants
  • Restore the String extension for auth token placeholders.

extension Location {
    static let hellotessDev = Location(locationID: "hellotess-dev", name: "HelloTess Dev")
    static let dishtrackerCloudDemo = Location(locationID: "dishtracker-cloud-demo", name: "Dishtracker Cloud Demo")
}

extension String {
    static let authDev = "Bearer xxx"
    static let authCloud = "Bearer xxx"
}

Original prompt

Create an iOS build in CI for the example app, that developers can download as github artifact and then maybe upload as firebase release.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[ahirner]

DISHTRACKER_SDK_TOKEN PAT can read ZeroQDishtrackerSDKiOS until June. I'm pretty sure signing with https://github.com/MoonVision/apple-certificates can be added easily?

First artifact:
https://github.com/MoonVision/ZeroQDishtrackerSDKiOSExample/actions/runs/21767791716/job/62811713884?pr=1