[APP-511] metrics overhaul: frontend work (#506)

* WIP

* fix types and update imports

* wip

* tagged events that should be server side

* remove server-side analytics

* remove useless import

* add additional profile header events

* remove useless import

* track follow/unfollow clicks

* add missing types

src/lib/analytics/analytics.web.tsx

@@ -0,0 +1,65 @@
+import React from 'react'
+import {
+  createClient,
+  AnalyticsProvider,
+  useAnalytics as useAnalyticsOrig,
+} from '@segment/analytics-react'
+import {RootStoreModel} from 'state/models/root-store'
+import {useStores} from 'state/models/root-store'
+import {sha256} from 'js-sha256'
+
+const segmentClient = createClient(
+  {
+    writeKey: '8I6DsgfiSLuoONyaunGoiQM7A6y2ybdI',
+  },
+  {
+    integrations: {
+      'Segment.io': {
+        apiHost: 'api.evt.bsky.app/v1',
+      },
+    },
+  },
+)
+export const track = segmentClient?.track?.bind?.(segmentClient)
+
+export function useAnalytics() {
+  const store = useStores()
+  const methods = useAnalyticsOrig()
+  return React.useMemo(() => {
+    if (store.session.hasSession) {
+      return methods
+    }
+    // dont send analytics pings for anonymous users
+    return {
+      screen: () => {},
+      track: () => {},
+      identify: () => {},
+      flush: () => {},
+      group: () => {},
+      alias: () => {},
+      reset: () => {},
+    }
+  }, [store, methods])
+}
+
+export function init(store: RootStoreModel) {
+  store.onSessionLoaded(() => {
+    const sess = store.session.currentSession
+    if (sess) {
+      if (sess.email) {
+        store.log.debug('Ping w/hash')
+        const email_hashed = sha256(sess.email)
+        segmentClient.identify(email_hashed, {email_hashed})
+      } else {
+        store.log.debug('Ping w/o hash')
+        segmentClient.identify()
+      }
+    }
+  })
+}
+
+export function Provider({children}: React.PropsWithChildren<{}>) {
+  return (
+    <AnalyticsProvider client={segmentClient}>{children}</AnalyticsProvider>
+  )
+}