Record screen: LIVE + SMS as square buttons bottom-left; toggle live on the fly

- move the SMS button out of the bottom panel into a left-hand square-button group
  (bottom-left, opposite the right control stack), add a LIVE toggle next to it
- LIVE turns location sharing on/off right from the record screen, even if it was
  never enabled in the profile; warns if the token is still unset
- LiveShare re-reads its config every tick so the toggle takes effect within ~10s

src-tauri/gen/android/app/src/main/java/dev/baldav/app/LiveShare.kt

@@ -47,7 +47,8 @@ object LiveShare {
     // Latest fix from the GPS flush loop (every ~10s). Non-blocking: the network call runs on a
     // throwaway thread so it never stalls the main looper that drives GPS delivery.
     fun tick(ctx: Context, lat: Double, lon: Double, speed: Float, fixTs: Long) {
-        if (!loaded) readCfg(ctx)
+        // re-read every tick so toggling the record-screen LIVE button takes effect within ~10s
+        readCfg(ctx)
         if (!enabled || url.isBlank() || token.isBlank()) return
         if (lat == 0.0 && lon == 0.0) return // no fix yet
         val now = System.currentTimeMillis()