CodeRabbit: in the production tier, a null version + present build produced
"null (42)". Guard the template (version && build) and fall back to the build
number alone, then "N/A".
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.
