Replace hardcoded configuration values with environment variables

[Copilot]

Hardcoded commission rates (0.10/0.90) and Firebase configuration values scattered across 7 files violated 12-factor app principles and required code changes for environment-specific settings.

Changes

Commission Rate Configuration

• payment_confirmation_screen.dart: Replaced widget.taskAmount * 0.10 with PointsService.calculateCommission() for consistent rate application
• payment_settings.dart, ai_service.dart: Display strings now dynamically format percentages from PointsService.platformCommissionRate / providerPayoutRate

Before:

final platformCommission = widget.taskAmount * 0.10;
final providerPayout = widget.taskAmount * 0.90;
// ...
'Platform Commission (10%)'

After:

final commissionCalculation = PointsService.calculateCommission(widget.taskAmount);
final platformCommission = commissionCalculation['platformCommission']!;
final providerPayout = commissionCalculation['providerPayout']!;
final platformCommissionRate = PointsService.platformCommissionRate;
// ...
'Platform Commission (${(platformCommissionRate * 100).toStringAsFixed(0)}%)'

Firebase Configuration

• app_config.dart: Added firebaseAuthActionUrl getter that constructs URLs from FIREBASE_PROJECT_ID
• fb.dart, loginp.dart, signuppage.dart: Replaced hardcoded 'com.example.connect' and 'https://YOUR_PROJECT_ID.firebaseapp.com/__/auth/action' with AppConfig.appPackageName, AppConfig.firebaseIosBundleId, and AppConfig.firebaseAuthActionUrl

Environment Variables

Uses existing .env.example variables:

• PLATFORM_COMMISSION_RATE (default: 0.10)
• PROVIDER_PAYOUT_RATE (default: 0.90)
• APP_PACKAGE_NAME (default: com.example.connect)
• FIREBASE_IOS_BUNDLE_ID (default: com.example.connect)
• FIREBASE_PROJECT_ID (constructs auth URLs)

All defaults maintain current behavior.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Hardcoded Configuration Values Instead of Environment Variables</issue_title>
<issue_description>## 🟡 Medium Priority Issue

Problem

Some configuration values are hardcoded in the code instead of using environment variables, reducing flexibility.

Examples

• Default commission rates in app_config.dart:184,193
• Some Firebase configuration might be hardcoded
• Default values that should be configurable

Impact

• Less flexible configuration
• Requires code changes to modify settings
• Not following 12-factor app principles

Expected Behavior

All configurable values should be in environment variables with sensible defaults.

Solution

Move hardcoded values to environment variables:

1. Add to .env.example
2. Update app_config.dart to read from environment
3. Provide sensible defaults

Additional Context

The app already uses environment variables for most configuration, but some values are still hardcoded.</issue_description>

<agent_instructions>you have to do this for the whole project if there are some errors </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Hardcoded Configuration Values Instead of Environment Variables #36

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