Android UX: sensor descriptions, auto-send on foreground, widget refresh

[fiddur]

Summary

• Live Sensors clarity: Added descriptive cards explaining what HR monitors (track heart rate and HRV in real time) and step sensors (track cadence and steps from a footpod) are for. Stops BLE scanning when a device is connected.
• Foreground sync: Pending Health Connect data is now always sent when the app comes to foreground, regardless of the background sync toggle.
• Widget refresh: The goals widget now refreshes its data whenever the app is brought to foreground.

Test plan

• Open Live Sensors tab with no devices connected — verify descriptive cards appear
• Scan for devices and connect one — verify scanning stops
• Collect some Health Connect data, close the app, re-open and go to Sync tab — verify data is sent automatically
• Check the goals widget updates after bringing the app to foreground

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.35%. Comparing base (4ea65dd) to head (71bcab6).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...src/main/java/net/aurboda/ui/screens/LiveScreen.kt	0.00%	14 Missing ⚠️
...roid/app/src/main/java/net/aurboda/MainActivity.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #244      +/-   ##
===========================================
- Coverage    27.37%   27.35%   -0.02%     
===========================================
  Files          176      176              
  Lines        23660    23674      +14     
  Branches      2104     2104              
===========================================
  Hits          6476     6476              
- Misses       17145    17159      +14     
  Partials        39       39              

Flag	Coverage Δ
android	8.74% <0.00%> (-0.04%)	⬇️
backend	57.58% <ø> (ø)
web	3.02% <ø> (ø)

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