Applies the same Swift 6 compatibility patterns from PR #166 (macOS) to the iOS app.
Changes:
- LocationService.swift: Added Sendable constraint to withTimeout<T> generic,
made CLLocationManagerDelegate methods nonisolated with Task { @MainActor in }
pattern to safely access MainActor state
- TalkModeManager.swift: Fixed OSLog string interpolation to avoid operator
overload issues with OSLogMessage in Swift 6
Addresses #164
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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