Ensure notif reqests get sent

[Nnanyere]

Description

When setting notification requests for a stop, the app checks to make sure the notification list has the reminders to be added and omits the reminders to be deleted. Otherwise, a popup appears telling the user the notification request could not be sent.

Type of Change

• New feature (feat)
• Bug fix (fix)
• Refactor / code improvement
• Dependency / build update
• Documentation
• Other (explain)

Changes Made

• Flutter:
  • stop_sheet.dart now displays a different error message
  • modifyReminders() in incoming_bus_reminder_service.dart now checks backend

Testing Done

Flutter:

• flutter analyze and flutter format passed
• Unit / widget tests added or updated (flutter test)
• Tested on:
  • iOS Simulator
  • Android Emulator
  • Physical device
• Firebase notifications tested (foreground, background, killed app)
• Offline mode / cache behavior checked

Backend:

• TypeScript compilation & linting passed
• Unit / integration tests passed
• Tested API endpoints (Postman / curl)
• Firebase Admin SDK behavior verified

Integration:

• Flutter app successfully calls updated backend endpoints
• End-to-end flow tested (e.g., bus arrival → notification)

Checklist

• Commit messages follow Conventional Commits
• PR title follows [type](scope): short description
• No print() / console.log() left in production code
• Code follows project style (Dart + ESLint/Prettier for TS)
• Secrets / keys not committed

[iswheeler]

Tested on Android emulator--looks good! Admittedly I'm not as familiar with the notification system so would probably be best if someone who has more experience with it could look this over too.

Just one small request--I noticed that when you edit your previous reminder settings, the dialog box shows you which buses you selected previously, but the slider always starts at 5 minutes. Could you make sure the dialog "remembers" the slider position (in addition to the checkboxes)?

Thanks!