feat(map): VUCC default chip, own-grid bold at all zooms, roamed-grid blue stripes

- Grid mode now opens with the VUCC award chip selected by default (re-asserted
  on every grid-mode entry; the user's in-mode chip choice is preserved).
- The station's own grid outline is now drawn at every zoom level: 2-char field
  border below the sub-square zoom, 4-char square border above it (was hidden
  at the default entry zoom), stroke widened to 6f.
- Grids the account operated from (LoTW <MY_GRIDSQUARE>, satellite QSOs only)
  are covered with GridMaster-style blue 45° zebra stripes. The stripe paint is
  fully opaque so a worked+roamed cell shows pure-blue stripes with green
  between them — the two colors never alpha-blend into a teal/green mix.
- LoTW sync now parses and persists the roamed set (LoTWResult.Success +
  SettingsRepo key 'roamedGrids'), plumbed through MapState/MapViewModel into
  MaidenheadGridOverlay. Unit tests cover MY_GRIDSQUARE parsing (SAT-only,
  GRIDSQUARE non-leak, 4-char truncation).

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

@@ -56,8 +56,16 @@ class MaidenheadGridOverlay : Overlay() {
         style = android.graphics.Paint.Style.FILL
         color = Color.argb(90, 76, 217, 100)
     }
+    private val roamStripePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        style = Paint.Style.STROKE
+        strokeWidth = 7f
+        // Fully opaque blue: stripe bands stay pure blue even over a green
+        // worked fill — no alpha blend into a teal/green mix (user requirement:
+        // the two colors must never stack into a single mixed color).
+        color = Color.argb(255, 66, 133, 244)
+    }
     private val ownLinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
-        strokeWidth = 4.5f
+        strokeWidth = 6f
         style = Paint.Style.STROKE
         color = Color.argb(255, 90, 200, 255)
     }
@@ -70,6 +78,12 @@ class MaidenheadGridOverlay : Overlay() {
     /** Worked gridsquares (4-char, uppercase) to highlight, e.g. {"OL62", "PM95"}. */
     var workedGrids: Set<String> = emptySet()
 
+    /**
+     * Gridsquares the station operated from (4-char, uppercase) — drawn with
+     * blue 45° stripes (GridMaster-style zebra), e.g. {"OL62", "PM95"}.
+     */
+    var roamedGrids: Set<String> = emptySet()
+
     /** The station's own 4-char gridsquare, drawn with a distinct outline. */
     var ownGrid: String? = null
 
@@ -120,8 +134,10 @@ class MaidenheadGridOverlay : Overlay() {
         val worldTurns = ceil(((rightLon - leftLon) / 360.0) - 1e-9).toInt().coerceAtLeast(0)
         val colRepeats = if (worldTurns > 0) worldTurns else 0
 
-        // The station's own grid square (4-char, only meaningful at sub-square zoom)
-        val ownCell = ownGrid?.takeIf { zoom >= GRID_ZOOM_SUB }
+        // The station's own grid: 4-char square at sub-square zoom, 2-char
+        // field at field zoom. Always marked so the "you are here" outline is
+        // visible even at the default entry zoom (below GRID_ZOOM_SUB).
+        val ownCell = ownGrid?.let { if (zoom >= GRID_ZOOM_SUB) it else it.take(2) }
         // The tapped worked grid gets a distinct outline (same zoom gate).
         val selectedCell = selectedGrid?.takeIf { zoom >= GRID_ZOOM_SUB }
 
@@ -182,6 +198,53 @@ class MaidenheadGridOverlay : Overlay() {
             }
         }
 
+        // Roamed/activated grid stripes: blue 45° zebra (GridMaster style) over
+        // every cell the station operated from. Drawn AFTER the worked fills so
+        // a worked+roamed cell shows blue stripes with green between them — the
+        // stripe paint is nearly opaque, so the two colors never alpha-blend
+        // into a teal/green mix. Same geometry as the worked fills (per-4-char
+        // cell at both zoom levels).
+        if (roamedGrids.isNotEmpty()) {
+            if (zoom >= GRID_ZOOM_SUB) {
+                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 yTop = projectionToY(projection, topLatCell) ?: continue
+                    val yBottom = projectionToY(projection, lat) ?: continue
+                    for (turn in -colRepeats..colRepeats) for (col in firstCol..lastCol) {
+                        val lon = col * cellLon
+                        val xLeftBase = projectionToX(projection, lon, centerLon, worldWidthPx) ?: continue
+                        val xRightBase = projectionToX(projection, lon + cellLon, centerLon, worldWidthPx) ?: continue
+                        val xLeft = xLeftBase + turn * worldWidthPx.toFloat()
+                        val xRight = xRightBase + turn * worldWidthPx.toFloat()
+                        if (xRight < 0f || xLeft > canvas.width) continue
+                        if (cellLabel(lat, lon, zoom) in roamedGrids) {
+                            drawStripes(canvas, xLeft, yTop, xRight, yBottom)
+                        }
+                    }
+                }
+            } else {
+                for (grid in roamedGrids) {
+                    val cell = gridCellBounds(grid) ?: continue
+                    for (turn in -colRepeats..colRepeats) {
+                        val dLon = turn * 360.0
+                        if (cell.lonRight + dLon <= leftLon || cell.lonLeft + dLon >= rightLon) continue
+                        val yTop = projectionToY(projection, cell.latTop) ?: continue
+                        val yBottom = projectionToY(projection, cell.latBottom) ?: continue
+                        val xLeftBase = projectionToX(projection, cell.lonLeft, centerLon, worldWidthPx) ?: continue
+                        val xRightBase = projectionToX(projection, cell.lonRight, centerLon, worldWidthPx) ?: continue
+                        val xLeft = xLeftBase + turn * worldWidthPx.toFloat()
+                        val xRight = xRightBase + turn * worldWidthPx.toFloat()
+                        if (xRight < 0f || xLeft > canvas.width) continue
+                        if (yBottom < 0f || yTop > canvas.height) continue
+                        drawStripes(canvas, xLeft, yTop, xRight, yBottom)
+                    }
+                }
+            }
+        }
+
         // Vertical lines (meridians). Worked-grid cells are NOT excluded:
         // the boundary lines between adjacent worked squares must stay visible
         // so the grid structure remains readable (reverted 2026-09-09 — the
@@ -287,6 +350,26 @@ class MaidenheadGridOverlay : Overlay() {
         }
     }
 
+    /**
+     * Draws 45° diagonal stripes (GridMaster-style zebra) clipped to the cell
+     * rectangle, from top-left to bottom-right. The paint is nearly opaque so
+     * stripes stay blue even over a green worked fill underneath.
+     */
+    private fun drawStripes(canvas: Canvas, xLeft: Float, yTop: Float, xRight: Float, yBottom: Float) {
+        if (xRight <= xLeft || yBottom <= yTop) return
+        canvas.save()
+        canvas.clipRect(xLeft, yTop, xRight, yBottom)
+        val height = yBottom - yTop
+        // Start one stripe-width left of the cell so the top-left corner is
+        // always covered; each stripe runs from (x, top) to (x+height, bottom).
+        var x = xLeft - height
+        while (x < xRight) {
+            canvas.drawLine(x, yTop, x + height, yBottom, roamStripePaint)
+            x += STRIPE_SPACING_PX
+        }
+        canvas.restore()
+    }
+
     /** X pixel for a longitude (meridians are vertical in Web Mercator). */
     private fun projectionToX(projection: Projection, lon: Double, centerLon: Double, worldWidthPx: Double): Float? {
         // Do NOT use osmdroid's toPixels() here: at low zoom its wrap-around
@@ -370,5 +453,7 @@ class MaidenheadGridOverlay : Overlay() {
         const val LABEL_ZOOM_SUB = 6.5
         const val MIN_LABEL_CELL_PX = 48f
         const val MAX_OVERSHOOT_PX = 64
+        /** Center-to-center spacing of the roamed-grid zebra stripes, in px. */
+        const val STRIPE_SPACING_PX = 16f
     }
 }

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

@@ -157,8 +157,9 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
     // Tapped worked grid -> centered QSO dialog. Local UI state: the map is the
     // only consumer and it resets when leaving the page.
     var selectedGrid by remember { mutableStateOf<String?>(null) }
-    // Selected award filter (null = "All" = plain worked-grid view).
-    var selectedAward by remember { mutableStateOf<AwardType?>(null) }
+    // Selected award filter. Entering grid mode defaults to VUCC (the plain
+    // worked-grid view); the reset effect below re-asserts that on every entry.
+    var selectedAward by remember { mutableStateOf<AwardType?>(AwardType.VUCC) }
     // Six-award progress derived from the confirmed QSO store; recomputed when
     // the store changes (LoTW/Wavelog sync).
     val awardProgress: List<AwardProgress> = remember(uiState.workedGridQsos) {
@@ -192,6 +193,11 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
         (mapView.overlays.getOrNull(OVERLAY_GRID) as? MaidenheadGridOverlay)?.selectedGrid = selectedGrid
         mapView.invalidate()
     }
+    // Re-assert the VUCC default each time grid mode is entered; while already
+    // in grid mode the user's chip choice is preserved.
+    LaunchedEffect(uiState.isGridMode) {
+        if (uiState.isGridMode) selectedAward = AwardType.VUCC
+    }
 
     LaunchedEffect(uiState.track) {
         // In grid mode the map is centered on the local grid square; following
@@ -249,7 +255,7 @@ private fun MapScreen(uiState: MapState, onAction: (MapAction) -> Unit, mapView:
                         // stationPosition would swallow the centering forever.
                         val shouldCenter = uiState.isGridMode && !prevGridMode
                         setGridMode(
-                            uiState.isGridMode, uiState.workedGrids, view,
+                            uiState.isGridMode, uiState.workedGrids, uiState.roamedGrids, view,
                             if (shouldCenter) uiState.stationPosition else null
                         )
                         if (!shouldCenter || uiState.stationPosition != null) {
@@ -631,6 +637,7 @@ private fun setAwardMode(award: AwardType, workedCodes: Set<String>, mapView: Ma
 private fun setGridMode(
     gridMode: Boolean,
     workedGrids: Set<String>,
+    roamedGrids: Set<String>,
     mapView: MapView,
     stationPosition: GeoPos?
 ) {
@@ -639,11 +646,13 @@ private fun setGridMode(
         if (gridOverlay is MaidenheadGridOverlay) {
             gridOverlay.isEnabled = gridMode
             gridOverlay.workedGrids = workedGrids
+            gridOverlay.roamedGrids = roamedGrids
             gridOverlay.ownGrid = ownGridOf(stationPosition)
         } else {
             mapView.overlays[OVERLAY_GRID] = MaidenheadGridOverlay().apply {
                 isEnabled = gridMode
                 this.workedGrids = workedGrids
+                this.roamedGrids = roamedGrids
                 this.ownGrid = ownGridOf(stationPosition)
             }
         }

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

@@ -29,6 +29,8 @@ data class MapState(
     val isGridMode: Boolean = false,
     val workedGrids: Set<String> = emptySet(),
     val workedGridQsos: Map<String, List<com.rtbishop.look4sat.core.domain.model.GridQso>> = emptyMap(),
+    /** 4-char gridsquares the station operated from (LoTW MY_GRIDSQUARE) — blue stripes. */
+    val roamedGrids: Set<String> = emptySet(),
     val stationPosition: GeoPos? = null,
     val orbitalPass: OrbitalPass,
     val track: List<List<GeoPos>>? = null,

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

@@ -82,7 +82,8 @@ class MapViewModel(
                 _uiState.update {
                     it.copy(
                         workedGrids = settingsRepo.getWorkedGrids(),
-                        workedGridQsos = settingsRepo.getWorkedGridQsos()
+                        workedGridQsos = settingsRepo.getWorkedGridQsos(),
+                        roamedGrids = settingsRepo.getRoamedGrids()
                     )
                 }
             }