Add rrweb-based session recording feature.

Implements full session recording with rrweb for DOM capture and rrweb-player
for playback. Includes: Prisma schema for SessionRecording model, chunked
gzip-compressed storage, recorder script built via Rollup, collection API
endpoint, recordings list/playback UI pages, website recording settings,
and cascade delete support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/hooks/useWebsiteNavItems.tsx

@@ -7,6 +7,7 @@ import {
   Tag,
   User,
   UserPlus,
+  Video,
 } from '@/components/icons';
 import { Funnel, Lightning, Magnet, Money, Network, Path, Target } from '@/components/svg';
 import { useMessages } from './useMessages';
@@ -94,6 +95,12 @@ export function useWebsiteNavItems(websiteId: string) {
           icon: <Magnet />,
           path: renderPath('/retention'),
         },
+        {
+          id: 'recordings',
+          label: formatMessage(labels.recordings),
+          icon: <Video />,
+          path: renderPath('/recordings'),
+        },
       ],
     },
     {