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.

static/css/main.css

@@ -260,6 +260,33 @@ body {
   line-height: 1.45;
 }
 
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin: 0 0 0.5rem 0;
+  font-weight: 700;
+  line-height: 1.2;
+}
+
+h1 {
+  font-size: var(--font-size-2xl);
+}
+
+h2 {
+  font-size: var(--font-size-xl);
+}
+
+h3 {
+  font-size: var(--font-size-lg);
+}
+
+p {
+  margin: 0 0 1rem 0;
+}
+
 a {
   color: var(--brand);
 }
@@ -296,18 +323,46 @@ a {
   gap: 1rem;
 }
 
-.brand-logo {
-  display: inline-flex;
+.sidebar-nav-controls {
+  display: flex;
+  justify-content: center;
+  gap: 0.5rem;
+  margin: 1rem 0;
+}
+
+.nav-chevron {
+  width: 40px;
+  height: 40px;
+  border: none;
+  border-radius: 50%;
+  background: rgba(255, 255, 255, 0.1);
+  color: rgba(255, 255, 255, 0.88);
+  font-size: 1.2rem;
+  font-weight: bold;
+  cursor: pointer;
+  display: flex;
   align-items: center;
   justify-content: center;
+  transition: background 0.2s ease, transform 0.2s ease;
+}
+
+.nav-chevron:hover,
+.nav-chevron:focus {
+  background: rgba(255, 255, 255, 0.2);
+  transform: scale(1.05);
+}
+
+.nav-chevron:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+  transform: none;
+}
+
+.brand-logo {
   width: 44px;
   height: 44px;
   border-radius: 12px;
-  background: linear-gradient(0deg, var(--brand-3), var(--accent));
-  color: var(--color-text-invert);
-  font-weight: 700;
-  font-size: 1.1rem;
-  letter-spacing: 1px;
+  object-fit: cover;
 }
 
 .brand-text {
@@ -927,6 +982,24 @@ tbody tr:nth-child(even) {
   color: var(--danger);
 }
 
+.alert {
+  padding: 0.75rem 1rem;
+  border-radius: var(--radius-sm);
+  margin-bottom: 1rem;
+}
+
+.alert-error {
+  background: rgba(209, 75, 75, 0.2);
+  border: 1px solid rgba(209, 75, 75, 0.4);
+  color: var(--color-text-invert);
+}
+
+.alert-info {
+  background: rgba(43, 168, 143, 0.2);
+  border: 1px solid rgba(43, 168, 143, 0.4);
+  color: var(--color-text-invert);
+}
+
 .site-footer {
   background-color: var(--brand);
   color: var(--color-text-invert);
@@ -939,6 +1012,19 @@ tbody tr:nth-child(even) {
   justify-content: center;
   padding: 1rem 0;
   font-size: 0.9rem;
+  gap: 1rem;
+}
+
+.footer-logo {
+  display: flex;
+  align-items: center;
+}
+
+.footer-logo-img {
+  width: 32px;
+  height: 32px;
+  border-radius: 8px;
+  object-fit: cover;
 }
 
 .sidebar-toggle {

static/css/projects.css

@@ -153,18 +153,6 @@
   }
 }
 
-.alert {
-  padding: 0.75rem 1rem;
-  border-radius: var(--radius-sm);
-  margin-bottom: 1rem;
-}
-
-.alert-error {
-  background: rgba(209, 75, 75, 0.2);
-  border: 1px solid rgba(209, 75, 75, 0.4);
-  color: var(--color-text-invert);
-}
-
 .form {
   display: flex;
   flex-direction: column;