feat(config): introduce Remote Config for audio properties

[masch]

Feature Request: Configure Audio Player Settings Remotely

Problem Description

Currently, audio properties such as the rewind offset (rewindOffsetMs) are statically declared inside src/config/app-config.ts. Changing these parameters requires modifying the code and re-releasing/re-compiling a new application bundle.

Proposed Solution

Introduce Firebase Remote Config (or a similar backend config provider) to dynamically fetch and override these settings in real-time or at application startup.

Steps

1. Configure Firebase Remote Config parameters for audio_rewind_offset_ms in the Firebase Console.
2. Implement a Remote Config service layer (e.g. src/storage/remote-config.ts) to fetch and cache settings.
3. Expose a hook useRemoteConfig or update APP_CONFIG dynamically at runtime.
4. Fall back to local parameters in src/config/app-config.ts if offline or the server keys are not yet configured.

Code Context

• src/config/app-config.ts
• src/components/trip-detail-view.tsx

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Created dynamically as a task artifact on 2026-06-10.