fix: sync dialogs use typed values directly (save+sync in one step); LoTW card wording; center map on station grid when entering grid mode; center grid labels in cells; update-check falls back to GitHub accelerator mirrors

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MaidenheadGridOverlay.kt

@@ -124,8 +124,8 @@ class MaidenheadGridOverlay : Overlay() {
             canvas.drawLine(0f, y, canvas.width.toFloat(), y, linePaint)
         }
 
-        // Labels: place at the top-left corner of each cell, only when the cell
-        // is large enough on screen to hold a label (avoid clutter at low zoom)
+        // Labels: centered in each cell, only when the cell is large enough on
+        // screen to hold a label (avoid clutter at low zoom)
         val showLabels = when {
             zoom >= GRID_ZOOM_SUB -> true
             zoom >= FIELD_ZOOM_LABELS -> true
@@ -140,20 +140,25 @@ class MaidenheadGridOverlay : Overlay() {
         val pixelsPerDegree = Math.abs(y2 - y1)
         if (pixelsPerDegree * cellLat < MIN_LABEL_CELL_PX) return
 
-        val labelOffset = 8f
+        labelPaint.textAlign = Paint.Align.CENTER
+        val fontMetrics = labelPaint.fontMetrics
+        val textHalfHeight = (fontMetrics.descent + fontMetrics.ascent) / 2f
         for (row in firstRow..lastRow) {
             val lat = row * cellLat
             if (lat < -90.0 || lat >= 90.0) continue
             val topLatCell = lat + cellLat
             if (topLatCell > 90.0) continue
-            val y = projectionToY(projection, topLatCell) ?: continue
-            if (y < -labelPaint.textSize || y > canvas.height) continue
+            val yTop = projectionToY(projection, topLatCell) ?: continue
+            val yBottom = projectionToY(projection, lat) ?: continue
+            val yCenter = (yTop + yBottom) / 2f - textHalfHeight
+            if (yBottom < 0f || yTop > canvas.height) continue
             for (col in firstCol..lastCol) {
                 val lon = col * cellLon
-                val x = projectionToX(projection, lon, centerLon) ?: continue
-                if (x < -200f || x > canvas.width) continue
+                val xLeft = projectionToX(projection, lon, centerLon) ?: continue
+                val xRight = projectionToX(projection, lon + cellLon, centerLon) ?: continue
+                if (xRight < 0f || xLeft > canvas.width) continue
                 val label = cellLabel(lat, lon, zoom)
-                canvas.drawText(label, x + labelOffset, y + labelPaint.textSize + labelOffset, labelPaint)
+                canvas.drawText(label, (xLeft + xRight) / 2f, yCenter, labelPaint)
             }
         }
     }

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapScreen.kt

@@ -42,7 +42,9 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
@@ -159,8 +161,15 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
         }
         ElevatedCard(modifier = Modifier.weight(1f)) {
             Box(contentAlignment = Alignment.BottomCenter) {
+                // Track grid-mode transitions so the map only re-centers when the
+                // mode is switched ON, not on every recomposition.
+                var prevGridMode by remember { mutableStateOf(uiState.isGridMode) }
                 AndroidView({ mapView }) { view ->
-                    setGridMode(uiState.isGridMode, uiState.workedGrids, view)
+                    setGridMode(
+                        uiState.isGridMode, uiState.workedGrids, view,
+                        if (uiState.isGridMode && !prevGridMode) uiState.stationPosition else null
+                    )
+                    prevGridMode = uiState.isGridMode
                     if (!uiState.isGridMode) {
                         uiState.stationPosition?.let { setStationPosition(it, view) }
                         uiState.track?.let { setSatelliteTrack(it, view) }
@@ -269,7 +278,12 @@ private fun MapDataCards(data: MapData) {
 // region Map overlay helpers
 
 /** Toggle the grid-mode layer visibility on/off without recreating any overlay. */
-private fun setGridMode(gridMode: Boolean, workedGrids: Set<String>, mapView: MapView) {
+private fun setGridMode(
+    gridMode: Boolean,
+    workedGrids: Set<String>,
+    mapView: MapView,
+    stationPosition: GeoPos?
+) {
     try {
         val gridOverlay = mapView.overlays[OVERLAY_GRID]
         if (gridOverlay is MaidenheadGridOverlay) {
@@ -286,6 +300,18 @@ private fun setGridMode(gridMode: Boolean, workedGrids: Set<String>, mapView: Ma
         for (index in OVERLAY_STATION..OVERLAY_MOON) {
             mapView.overlays.getOrNull(index)?.isEnabled = !gridMode
         }
+        // Entering grid mode: center on the station's current grid square,
+        // keeping the current zoom level unchanged.
+        if (gridMode) {
+            val pos = stationPosition ?: return
+            val lat = pos.latitude
+            val lon = pos.longitude
+            val fieldLat = ((lat + 90.0) / 10.0).toInt().coerceIn(0, 17)
+            val fieldLon = ((lon + 180.0) / 20.0).toInt().coerceIn(0, 17)
+            val centerLat = fieldLat * 10.0 + 5.0
+            val centerLon = fieldLon * 20.0 + 10.0
+            mapView.controller.setCenter(GeoPoint(centerLat, centerLon))
+        }
     } catch (e: Exception) {
         println(e)
     }

feature/map/src/main/java/com/rtbishop/look4sat/feature/map/MapViewModel.kt

@@ -84,6 +84,7 @@ class MapViewModel(
         }
         val (selectedCatNum, _) = satelliteRepo.selectedPass.value
         selectDefaultSatellite(if (selectedCatNum != 0) selectedCatNum else -1)
+        getStationPosition()
     }
 
     fun onAction(action: MapAction) {