AU-014: Compare against minimum version and show warning banner

Track: 1 — MVP
Section: 1.25 Firmware Version Check
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-014-firmware-warning-banner

Done When

If firmware < min version (from remote config or hardcoded), show non-blocking banner on device screen: "Firmware update available". Dismiss-able. Does not block usage

Notes

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