feat(dashboard): add data labels toggle, dual-axis capture rate chart, mobile bottom nav

- Global data labels toggle in header (works on Dashboard & Comparison pages)
- Labels show formatted values (K/M suffix, max 2 decimals) with white pill background
- Capture Rate chart now shows pilgrims as curved line on right Y-axis
- Revenue Trends toggle moved to top-right corner of chart container
- Mobile: bottom navigation bar with Dashboard, Compare, Labels toggle
- Mobile: top nav simplified to brand only, bottom nav is thumb-friendly

public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}