Accelerometer UI redesign, multi-axis chart, edge-to-edge fix, previews, LinearAcceleration UI match, hardcoded strings → resources, modern buttons, CI release notes

[shreyashp47]

Changes

• Accelerometer UI redesign: New mockup-inspired layout with category header, colored 3-column axis value cards (X red, Y green, Z blue), and waveform card
• Multi-axis line chart: New MultiAxisLineChart composable showing X/Y/Z lines with colors, tap crosshair with all 3 values, legend
• LinearAccelerationScreen: Matched to Accelerometer's new UI
• Edge-to-edge fix: Added statusBarsPadding() / navigationBarsPadding() to all screens (Dashboard, Compass, Settings, History, SensorDetailScaffold)
• Modern buttons: Rounded shapes, OutlinedButton for secondary actions
• Previews: Added @Preview functions to all 9 detail screen files
• Hardcoded strings → strings.xml: Moved sensor names, descriptions, categories, units, usage hints, and dashboard text to string resources via new SensorStrings.kt helper
• CI: Added GitHub Release creation with AAB artifact + Play Store release notes from commit history
• Gravity bubble level: New spirit-level visualization on GravityScreen — Canvas bubble inside concentric rings, tilt angle text (e.g. "Tilted 8° right"), axis cards, chart
• RotationVector orientation UI: Redesigned to show phone silhouette indicator rotated by azimuth/roll, 3-column Azimuth/Pitch/Roll angle cards, Quaternion (x, y, z, w) display, chart
• RotationVector crash fix: sensorUnitText("") no longer throws on empty unit strings

Files changed

22 files changed, +1406/−137