feat: VAT toggle + offline mode

- Rename Revenue to GrossRevenue, add NetRevenue (excl. VAT)
- Add VAT toggle (Incl/Excl) on Dashboard and Comparison pages
- Add offline mode with localStorage caching (24h validity)
- Add refresh button and offline indicator in nav
- Remove Google Sheets fallback (archived to dataService.legacy.js)
- Add AR/EN translations for new UI elements

src/App.css

@@ -271,38 +271,6 @@ html[dir="rtl"] {
   border-color: var(--primary);
 }
 
-.nav-label-toggle {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-  padding: 8px 14px;
-  border-radius: 8px;
-  font-size: 0.75rem;
-  font-weight: 600;
-  cursor: pointer;
-  transition: all 0.2s;
-  background: var(--bg);
-  border: 1px solid var(--border);
-  color: var(--text-muted);
-  margin-left: 8px;
-}
-
-.nav-label-toggle:hover {
-  background: var(--surface);
-  color: var(--text-primary);
-  border-color: var(--primary);
-}
-
-.nav-label-toggle.active {
-  background: #10b981;
-  color: white;
-  border-color: #10b981;
-}
-
-.nav-label-toggle svg {
-  opacity: 0.8;
-}
-
 .nav-link.active svg {
   opacity: 1;
 }
@@ -341,6 +309,58 @@ html[dir="rtl"] .nav-lang-toggle {
   font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
 }
 
+/* Offline Badge */
+.offline-badge {
+  display: flex;
+  align-items: center;
+  gap: 5px;
+  padding: 6px 12px;
+  background: #fef3c7;
+  color: #92400e;
+  border-radius: 6px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  border: 1px solid #fcd34d;
+}
+
+.offline-badge svg {
+  opacity: 0.8;
+}
+
+/* Refresh Button */
+.nav-refresh-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 36px;
+  height: 36px;
+  border-radius: 8px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  background: transparent;
+  border: 1px solid var(--border);
+  color: var(--text-muted);
+}
+
+.nav-refresh-btn:hover {
+  background: var(--surface);
+  color: var(--text-primary);
+  border-color: var(--primary);
+}
+
+.nav-refresh-btn:active {
+  transform: scale(0.96);
+}
+
+.nav-refresh-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.nav-refresh-btn.refreshing svg {
+  animation: spin 1s linear infinite;
+}
+
 /* Main Content */
 .dashboard,
 .comparison {
@@ -394,6 +414,18 @@ html[dir="rtl"] .nav-lang-toggle {
   color: var(--text-secondary);
 }
 
+/* Header Toggles Container (for multiple toggles side by side) */
+.header-toggles {
+  display: flex;
+  align-items: center;
+  gap: 24px;
+  margin-top: 6px;
+}
+
+.header-toggles .toggle-with-label {
+  margin-top: 0;
+}
+
 /* Filters - now uses .controls for consistency */
 
 /* Stats Grid */
@@ -870,33 +902,6 @@ table tbody tr:hover {
   box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
 }
 
-/* Data Labels Toggle */
-.label-toggle {
-  display: flex;
-  align-items: center;
-  gap: 4px;
-  border: 2px solid var(--border);
-  background: var(--surface);
-  color: var(--text-muted);
-  padding: 8px 14px;
-  border-radius: 10px;
-  font-size: 0.8rem;
-  font-weight: 500;
-  cursor: pointer;
-  transition: all 0.25s ease;
-}
-
-.label-toggle:hover {
-  border-color: var(--primary);
-  color: var(--text-primary);
-}
-
-.label-toggle.active {
-  background: var(--primary);
-  border-color: var(--primary);
-  color: white;
-}
-
 .chart-metric-selector button {
   border: none;
   background: transparent;
@@ -926,13 +931,6 @@ table tbody tr:hover {
   margin-bottom: 32px;
 }
 
-.chart-selectors-bar {
-  display: flex;
-  gap: 8px;
-  margin-bottom: 16px;
-  flex-wrap: wrap;
-}
-
 /* Inline selectors inside chart cards (mobile) */
 .chart-selectors-inline {
   display: flex;
@@ -1305,11 +1303,6 @@ table tbody tr:hover {
     flex-wrap: wrap;
   }
   
-  /* Chart selectors bar */
-  .chart-selectors-bar {
-    justify-content: center;
-  }
-  
   /* Carousel - overlay arrows on mobile */
   .carousel-arrow {
     width: 28px;
@@ -1484,10 +1477,6 @@ table tbody tr:hover {
   .carousel-dot .dot-label {
     font-size: 0.5625rem;
   }
-  
-  .chart-selectors-bar {
-    gap: 4px;
-  }
 }
 
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