feat(settings): graduated version tracking + Jellyfin clientInfo auto-sync

Settings "App version" now shows a graduated build identifier (utils/version.ts,
read defensively so it never crashes the screen):
- dev / local            -> "0.54.1 - branch - commit"
- develop / CI / preview  -> "0.54.1 - commit"
- production (store/TestFlight) -> "0.54.1 (42)"

app.config.js injects extra.build {commit, branch, profile, builtAt} from
EAS_BUILD_* / GITHUB_* / local git; build-apps.yml passes the PR branch+commit.
JellyfinProvider now sends APP_VERSION (auto-synced from expo-application) in its
clientInfo/auth header instead of a hardcoded "0.54.1". Version scheme unchanged.

components/settings/UserInfo.tsx

@@ -1,8 +1,8 @@
-import * as Application from "expo-application";
 import { useAtom } from "jotai";
 import { useTranslation } from "react-i18next";
 import { View, type ViewProps } from "react-native";
 import { apiAtom, userAtom } from "@/providers/JellyfinProvider";
+import { getVersionInfo } from "@/utils/version";
 import { ListGroup } from "../list/ListGroup";
 import { ListItem } from "../list/ListItem";
 
@@ -13,13 +13,9 @@ export const UserInfo: React.FC<Props> = ({ ...props }) => {
   const [user] = useAtom(userAtom);
   const { t } = useTranslation();
 
-  // Show "0.54.1 (42)": the build number (CFBundleVersion / versionCode, auto-incremented
-  // by EAS) uniquely identifies a build, so TestFlight/dev reports still pin the exact build.
-  const appVersion = Application?.nativeApplicationVersion;
-  const buildVersion = Application?.nativeBuildVersion;
-  const version = appVersion
-    ? `${appVersion}${buildVersion ? ` (${buildVersion})` : ""}`
-    : buildVersion || "N/A";
+  // Graduated build identifier — see utils/version.ts:
+  // dev → "0.54.1 · branch · commit", develop/CI → "0.54.1 · commit", production → "0.54.1 (42)".
+  const { display: version } = getVersionInfo();
 
   return (
     <View {...props}>