Add Improv external bus messages models

[TimoPtr]

Summary

This is the first PR to introduce Improv into the FrontendScreen, it basically contains all the data model used. I've also disabled Improve at the GetConfig level when we don't have BLE on the device which makes more sense than even showing the dialog.

Checklist

• New or updated tests have been added to cover the changes following the testing guidelines.
• The code follows the project's code style and best_practices.
• The changes have been thoroughly tested, and edge cases have been considered.
• Changes are backward compatible whenever feasible. Any breaking changes are documented in the changelog for users and/or in the code for developers depending on the relevance.

[Copilot]

Pull request overview

Introduces typed external-bus message models and capability reporting for Improv (BLE-based Wi‑Fi onboarding) in the Compose FrontendScreen path, plus unit tests to validate parsing/serialization and handler routing.

Changes:

• Added incoming (improv/scan, improv/configure_device) and outgoing (improv/discovered_device, improv/device_setup_done) external bus message models
• Extended config/get response with canSetupImprov, derived from Bluetooth LE availability via an injected BluetoothCapabilities
• Added/updated unit tests covering JSON parsing, serialization, and handler event emission for the new message types

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
app/src/main/kotlin/io/homeassistant/companion/android/frontend/externalbus/incoming/IncomingExternalBusMessage.kt	Adds typed incoming Improv message models
app/src/main/kotlin/io/homeassistant/companion/android/frontend/externalbus/outgoing/CommandMessage.kt	Adds outgoing Improv command factories/messages
app/src/main/kotlin/io/homeassistant/companion/android/frontend/externalbus/outgoing/OutgoingExternalBusMessage.kt	Adds canSetupImprov to ConfigResult factory/payload
app/src/main/kotlin/io/homeassistant/companion/android/frontend/handler/FrontendMessageHandler.kt	Routes Improv incoming messages to handler events; reports canSetupImprov in config
app/src/main/kotlin/io/homeassistant/companion/android/frontend/handler/FrontendHandlerEvent.kt	Adds handler events for starting scan and configuring a selected device
app/src/main/kotlin/io/homeassistant/companion/android/frontend/FrontendViewModel.kt	Temporarily ignores Improv events (logs only)
app/src/main/kotlin/io/homeassistant/companion/android/frontend/improv/BluetoothCapabilities.kt	Introduces testable BLE capability interface
app/src/main/kotlin/io/homeassistant/companion/android/frontend/improv/FrontendImprovModule.kt	Hilt provider for BluetoothCapabilities using PackageManager
app/src/test/kotlin/io/homeassistant/companion/android/frontend/handler/FrontendMessageHandlerTest.kt	Adds handler tests for config flag + Improv events
app/src/test/kotlin/io/homeassistant/companion/android/frontend/externalbus/incoming/IncomingExternalBusMessageTest.kt	Adds decode tests for Improv incoming messages
app/src/test/kotlin/io/homeassistant/companion/android/frontend/externalbus/outgoing/OutgoingExternalBusMessageTest.kt	Adds config serialization/assertions for canSetupImprov
app/src/test/kotlin/io/homeassistant/companion/android/frontend/externalbus/outgoing/CommandMessageTest.kt	Adds serialization tests for new Improv outgoing commands

[jpelgrom]

I've also disabled Improve at the GetConfig level when we don't have BLE on the device which makes more sense than even showing the dialog.

Nice improvement. Do you want to change it in the existing files as well?