refactor(app): remove legacy sensor fragments

[Foxpace]

Removes the legacy phone fragments and display helpers used for sensor browsing and live values.

What was added

• Removal of home and sensor-information fragments.
• Removal of GPS, phone-sensor, and Wear OS sensor displayers.
• Removal of the shared SensorInfoView abstraction.

How it works

The sensor preview and details Compose screens now render SensorDescriptor data and observed values directly from MainViewModel state. This replaces fragment transactions and manual TextView or map updates with declarative recomposition.

Stack position

Layer 23 of 31 in the SensorBox refactor stack. Review this PR against its configured base to see only this layer.

Validation

• Full stack: ./gradlew test — BUILD SUCCESSFUL (160 tasks)

[Foxpace]

Superseded by #46, which targets master and shows the final current tree. Closing this stacked layer so review stays on the consolidated diff; this PR remains available as history.