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.

providers/JellyfinProvider.tsx

@@ -40,6 +40,7 @@ import {
 } from "@/utils/secureCredentials";
 import { store } from "@/utils/store";
 import { clearTVDiscoverySafely } from "@/utils/tvDiscovery/sync";
+import { APP_VERSION } from "@/utils/version";
 
 interface Server {
   address: string;
@@ -53,7 +54,7 @@ const initialApi = (() => {
       const id = getOrSetDeviceId();
       const deviceName = getDeviceNameSync();
       const jellyfinInstance = new Jellyfin({
-        clientInfo: { name: "Streamyfin", version: "0.54.1" },
+        clientInfo: { name: "Streamyfin", version: APP_VERSION },
         deviceInfo: {
           name: deviceName,
           id,
@@ -135,7 +136,7 @@ export const JellyfinProvider: React.FC<{ children: ReactNode }> = ({
       const id = getOrSetDeviceId();
       const deviceName = getDeviceNameSync();
       return new Jellyfin({
-        clientInfo: { name: "Streamyfin", version: "0.54.1" },
+        clientInfo: { name: "Streamyfin", version: APP_VERSION },
         deviceInfo: {
           name: deviceName,
           id,
@@ -169,7 +170,7 @@ export const JellyfinProvider: React.FC<{ children: ReactNode }> = ({
     return {
       authorization: `MediaBrowser Client="Streamyfin", Device=${
         Platform.OS === "android" ? "Android" : "iOS"
-      }, DeviceId="${deviceId}", Version="0.54.1"`,
+      }, DeviceId="${deviceId}", Version="${APP_VERSION}"`,
     };
   }, [deviceId]);