mobile: network member management and avatars (parity phase 2)

- New NetworkSettingsScreen (reachable from the stream-list header) lists
  members with admin remove, an invite-by-email sheet, and pending
  invitations with revoke — backed by new use-member-management hooks.
- Avatars: add avatar_object_id to HumanSchema, uploadAvatar/deleteAvatar/
  getAvatarDownloadUrl client methods (raw PUT via expo-file-system), a
  use-avatar-url hook, and image rendering in the shared Avatar component.
  AccountScreen gains a tap-to-change profile picture via expo-image-picker.
- auth-store gains refreshUser to pick up avatar changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01LqGPzXQ1AA9CqYHgCgmbtV

js/mobile/yarn.lock

@@ -4278,6 +4278,18 @@ expo-haptics@~15.0.7:
   resolved "https://registry.yarnpkg.com/expo-haptics/-/expo-haptics-15.0.8.tgz#f93f895ac5d76fe0c5ac26b3644e1dbb097833f3"
   integrity sha512-lftutojy8Qs8zaDzzjwM3gKHFZ8bOOEZDCkmh2Ddpe95Ra6kt2izeOfOfKuP/QEh0MZ1j9TfqippyHdRd1ZM9g==
 
+expo-image-loader@~6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/expo-image-loader/-/expo-image-loader-6.0.0.tgz#15230442cbb90e101c080a4c81e37d974e43e072"
+  integrity sha512-nKs/xnOGw6ACb4g26xceBD57FKLFkSwEUTDXEDF3Gtcu3MqF3ZIYd3YM+sSb1/z9AKV1dYT7rMSGVNgsveXLIQ==
+
+expo-image-picker@~17.0.8:
+  version "17.0.11"
+  resolved "https://registry.yarnpkg.com/expo-image-picker/-/expo-image-picker-17.0.11.tgz#8f1537df946f7c19747ba9d0043ef7e3e8cb67dc"
+  integrity sha512-/apkoyukDvsCHHb9fzP+F34A1uQqSzUtYH/2P/xJACNEwq+mwEXjXvVU8bzlJq6ih0Qo1+tpVivIa7B9kYSwOQ==
+  dependencies:
+    expo-image-loader "~6.0.0"
+
 expo-keep-awake@~15.0.8:
   version "15.0.8"
   resolved "https://registry.yarnpkg.com/expo-keep-awake/-/expo-keep-awake-15.0.8.tgz#911c5effeba9baff2ccde79ef0ff5bf856215f8d"