Add display options form for website shares

Allow users to select which navigation items to display when creating
or editing a share. Options include traffic, behavior, and growth
sections with checkboxes for each nav item (excluding segments/cohorts).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(main)/websites/[websiteId]/settings/constants.ts

@@ -0,0 +1,30 @@
+export const SHARE_NAV_ITEMS = [
+  {
+    section: 'traffic',
+    items: [
+      { id: 'overview', label: 'overview' },
+      { id: 'events', label: 'events' },
+      { id: 'sessions', label: 'sessions' },
+      { id: 'realtime', label: 'realtime' },
+      { id: 'compare', label: 'compare' },
+      { id: 'breakdown', label: 'breakdown' },
+    ],
+  },
+  {
+    section: 'behavior',
+    items: [
+      { id: 'goals', label: 'goals' },
+      { id: 'funnels', label: 'funnels' },
+      { id: 'journeys', label: 'journeys' },
+      { id: 'retention', label: 'retention' },
+    ],
+  },
+  {
+    section: 'growth',
+    items: [
+      { id: 'utm', label: 'utm' },
+      { id: 'revenue', label: 'revenue' },
+      { id: 'attribution', label: 'attribution' },
+    ],
+  },
+];