Add battery optimization to setup wizard

[GeiserX]

Summary

• Adds Step 4 (Battery Optimization) to the setup wizard
• Detects opt-out status via PowerManager.isIgnoringBatteryOptimizations
• "Continue to Dashboard" requires all 4 steps complete (server, notification, usage, battery)
• Skip still available for users who want to configure later

Test plan

• Fresh install shows 4 setup steps
• Battery step shows checkmark after disabling optimization
• Continue button enables only when all 4 steps are green

Summary by CodeRabbit

Release Notes

• New Features
  • Added a new setup step for battery optimization that guides users to disable battery optimization settings. This ensures the app's background service continues running and prevents interruptions to critical functionality when the device screen is off.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 84a554e3-b962-46da-bcd7-06f089b9ccc5

📥 Commits

Reviewing files that changed from the base of the PR and between a24a5d2 and bc139cc.

📒 Files selected for processing (1)

• app/src/main/java/com/cashpilot/android/ui/MainActivity.kt

📝 Walkthrough

Walkthrough

This pull request adds battery optimization permission checking to the app's setup flow. A new StateFlow in MainViewModel tracks whether battery optimization is disabled, the permission check is integrated into the existing permission validation logic, and a new setup screen step guides users to disable battery optimization to maintain service reliability.

Changes

Cohort / File(s)	Summary
ViewModel Battery State app/src/main/java/com/cashpilot/android/ui/MainViewModel.kt	Added hasBatteryOptOut: StateFlow<Boolean> property and extended checkPermissions() to query PowerManager.isIgnoringBatteryOptimizations(), setting the state based on the result.
Setup Screen UI app/src/main/java/com/cashpilot/android/ui/screen/SetupScreen.kt	Added new "Step 4: Battery optimization" card displaying battery opt-out state. Extended "Continue" button enabled condition to require battery optimization to be disabled. Introduced openBatteryOptimizationSettings() helper to launch Android battery optimization settings, with corresponding UI button.
String Resources app/src/main/res/values/strings.xml	Added two new string resources (setup_battery_title and setup_battery_desc) describing the battery optimization step and its importance for service reliability.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A battery block, to let us thrive,
No optimization to kill our drive,
The heartbeat steady, the service alive,
Through darkened screens, our apps will survive! ⚡

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a battery optimization step to the setup wizard, which is the primary focus of all file modifications.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/battery-setup

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