fix: refactor duplicated Card widget in PowerSource screen

[rahul31124]

Fixes #3185

Changes

• Refactored duplicated Card widget code in the PowerSource screen.
• Created a reusable _buildPowerCard widget to avoid code duplication.
• Replaced the four repeated card implementations with calls to the reusable widget.
• Improved code readability and maintainability without changing existing functionality.
• Reduced file size from 738 lines to 462 lines.

Screenshots / Recordings

Checklist:

• No hard coding: I have used values from constants.dart or localization files instead of hard-coded values.
• No end of file edits: No modifications done at end of resource files.
• Code reformatting: I have formatted the code using dart format or the IDE formatter.
• Code analysis: My code passes checks run in flutter analyze and tests run in flutter test.

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/24629651450/artifacts/6518439720.

Screenshots

Android Screenshots

iPhone Screenshots

iPad Screenshots