Create App Store build without offers

[Rigidity]

Note

Medium Risk
Wide UI surface area and two iOS release artifacts increase the chance of inconsistent builds or missed entry points (routes still exist in App.tsx); wallet offer logic in Rust is unchanged aside from formatting.

Overview
Adds build-time feature toggles (VITE_DISABLE_OFFERS, VITE_DISABLE_OPTIONS, VITE_DISABLE_SWAP) via src/lib/features.ts, replacing hard-coded iOS checks so the same binary shape can hide Offers, Options, and Swap when env vars are set at build time.

The CI iOS matrix now produces two App Store Connect builds: TestFlight (all features on, build number 1) and App Store (offers/options/swap disabled, build number 2). iOS steps use platform_type: iOS, pass the VITE_* flags into the signed build, copy each IPA to a distinct artifacts/ios/ name, and upload/release from those paths.

Across the app, offer-related UI (nav, “add to offer”, Dexie/local offer sections, QR offer routing, default offer expiry, resync/migration copy) is gated on offersEnabled; options nav and option picker in offers use optionsEnabled; swap nav uses swapEnabled. Copy for locked coins and confirmations no longer mentions offers when disabled.

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[Rigidity]

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^{Reviewed by Cursor Bugbot for commit fd6f936. Configure here.}