feat: Enhance project and scenario creation with monitoring metrics

- Added monitoring metrics for project creation success and error handling in `ProjectRepository`.
- Implemented similar monitoring for scenario creation in `ScenarioRepository`.
- Refactored `run_monte_carlo` function in `simulation.py` to include timing and success/error metrics.
- Introduced new CSS styles for headers, alerts, and navigation buttons in `main.css` and `projects.css`.
- Created a new JavaScript file for navigation logic to handle chevron buttons.
- Updated HTML templates to include new navigation buttons and improved styling for buttons.
- Added tests for reporting service and routes to ensure proper functionality and access control.
- Removed unused imports and optimized existing test files for better clarity and performance.

routes/dashboard.py

@@ -3,10 +3,10 @@ from __future__ import annotations
 from datetime import datetime
 
 from fastapi import APIRouter, Depends, Request
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, RedirectResponse
 from fastapi.templating import Jinja2Templates
 
-from dependencies import get_unit_of_work, require_authenticated_user
+from dependencies import get_current_user, get_unit_of_work
 from models import ScenarioStatus, User
 from services.unit_of_work import UnitOfWork
 
@@ -108,12 +108,15 @@ def _load_scenario_alerts(
     return alerts
 
 
-@router.get("/", response_class=HTMLResponse, include_in_schema=False, name="dashboard.home")
+@router.get("/", include_in_schema=False, name="dashboard.home", response_model=None)
 def dashboard_home(
     request: Request,
-    _: User = Depends(require_authenticated_user),
+    user: User | None = Depends(get_current_user),
     uow: UnitOfWork = Depends(get_unit_of_work),
-) -> HTMLResponse:
+) -> HTMLResponse | RedirectResponse:
+    if user is None:
+        return RedirectResponse(request.url_for("auth.login_form"), status_code=303)
+
     context = {
         "metrics": _load_metrics(uow),
         "recent_projects": _load_recent_projects(uow),