Advertise the Rust preview platform over BLE

[enaboapps]

Summary

• add the host platform to the shared BLE status payload
• reuse one serializer from the Rust Windows and macOS GATT implementations
• keep the BLE local name and protocol version unchanged

Why

Android can now distinguish nearby Windows and macOS Rust-preview hosts without relying on platform-specific Bluetooth device names.

Compatibility

platform is additive and uses windows or macos. Older Android clients ignore the extra JSON field, and the shipping C# implementation is unchanged.

Test plan

• npm run lint
• npm test
• npm run build
• cargo fmt --manifest-path src-tauri/Cargo.toml --check
• cargo clippy --locked --manifest-path src-tauri/Cargo.toml --all-targets -- -D warnings
• cargo test --locked --manifest-path src-tauri/Cargo.toml

Coordination

Android consumer: switchifyapp/switchify-android#2767

Closes #512

[greptile-apps]

Greptile Summary

The PR adds the host platform to the Rust preview's BLE status payload while retaining the existing local name and protocol version.

• Introduces a shared serializer for the BLE status payload.
• Advertises stable windows and macos platform values.
• Reuses the serializer in both Windows and macOS GATT implementations.
• Adds serialization coverage for both supported platform values.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified in the changed BLE status path.

The serializer preserves all existing status fields and protocol metadata, adds the stable target-derived platform value, and is integrated compatibly into both platform-specific GATT implementations.

Important Files Changed

Filename	Overview
cross-platform/src-tauri/src/protocol.rs	Adds a typed shared BLE status serializer and tests that both supported platforms are included without changing the protocol version.
cross-platform/src-tauri/src/macos.rs	Replaces inline status JSON construction with the shared serializer and sources the immutable macOS platform capability.
cross-platform/src-tauri/src/windows_runtime.rs	Uses the shared serializer for status reads and includes the Windows platform capability in each response.

Sequence Diagram

sequenceDiagram
    participant Android
    participant GATT as Rust BLE GATT
    participant Serializer as bluetooth_status_payload
    participant State as Shared app state
    Android->>GATT: Read status characteristic
    GATT->>State: Read desktop ID and platform
    GATT->>Serializer: Serialize name, ID, platform, protocol version
    Serializer-->>GATT: JSON bytes
    GATT-->>Android: BLE status payload

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_{Reviews (1): Last reviewed commit: "Advertise Rust preview platform" | Re-trigger Greptile}