Improve Hazard Reporting UX with Confirmation & Clear Option

**Features**

- Show a toast/popup after submitting a hazard (success or error).
- Add a “Clear All Reports” button in map controls to remove all markers (with optional confirmation).

Checklist:

- Add success/error notification after report
- Add “Clear All Reports” button
- confirmation before clearing
Improves user experience by giving clear feedback and keeping the map clutter-free.

I'd like to work on this issue ,,Assign it to me @anditisyou