feat(map): 网格通联详情呼号列加宽（次数列不再等分，字样位置不变）

工作网格 QSO 详情弹窗里，中间那一列（通联行的「n QSO」、标记行的「标记」）
原来和左右两列一样占 weight(1f)（各 1/3 宽），而该列文字是居中的，字样两侧的
空白被白白占用。现改为按内容宽度占位（去掉 weight(1f)），左右两列仍各占
weight(1f)：两外列等分剩余宽度 ⇒ 中列起点正好落在原居中字样的左边界，
因此

- 「n QSO」「标记」字形位置与之前逐像素一致，日期与展开箭头（右对齐）不动；
- 省出的中列左半空白全部交给呼号列，呼号列宽度由 W/3 增至 (W - 字样宽)/2，
  411dp 屏约 +33dp，长呼号（含 /P、活动特别呼号）多显示约 3 个字符，
  并可一直排到「n QSO」字样左侧才省略。

仅影响地图页「网格通联详情」弹窗内的两类行；设置页日志本行本就是
「呼号 weight + 尾部标签 wrap-content」，口径已一致，未改动。

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

@@ -730,11 +730,12 @@ private fun MarkedStationRow(
         )
         // "标记" column: pin icon (only when the grid has multiple marks) sits
         // left of the label; pinned (first) row's icon is grey, others pale
-        // yellow — tapping moves that mark to the top.
+        // yellow — tapping moves that mark to the top. Wrap-content (no weight),
+        // same as the count column of the QSO rows, so the callsign column next
+        // to it takes the leftover width while these glyphs stay row-centred.
         Row(
             verticalAlignment = Alignment.CenterVertically,
-            horizontalArrangement = Arrangement.Center,
-            modifier = Modifier.weight(1f)
+            horizontalArrangement = Arrangement.Center
         ) {
             if (showPin) {
                 Icon(
@@ -807,8 +808,13 @@ private fun WorkedGridCallRow(
                 else stringResource(R.string.grid_qso_count_many, callQsos.size),
                 style = MaterialTheme.typography.bodySmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
-                textAlign = androidx.compose.ui.text.style.TextAlign.Center,
-                modifier = Modifier.weight(1f)
+                textAlign = androidx.compose.ui.text.style.TextAlign.Center
+                // No weight: the count column wraps its content, so the callsign
+                // column (weight 1f, opposite the date column) absorbs the slack
+                // that used to sit left of the centred count text. The count text
+                // keeps its exact on-screen position: with equal weights on the
+                // outer columns the wrap-content middle column starts where the
+                // centred text used to start, i.e. its centre stays at row centre.
             )
             Row(
                 verticalAlignment = Alignment.CenterVertically,