feat(map): tap worked grid at zoom>=7 to show per-grid satellite QSO dialog

- LoTW sync now stores per-QSO detail (call/time/sat/mode/bands) grouped by
  gridsquare (PROP_MODE=SAT only), single JSON blob in SharedPreferences
- GridQso model derives band label (V/U, U/V, V/A...) from BAND_RX/BAND
- Tap detection via osmdroid MapEventsOverlay; selected grid outlined green
- Centered dialog: calls sorted by first-contact time, first-QSO summary,
  expandable call rows list subsequent QSOs in that grid; tap outside closes

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/model/GridQso.kt

@@ -0,0 +1,64 @@
+/*
+ * Look4Sat. Amateur radio satellite tracker and pass predictor.
+ * Copyright (C) 2019-2026 Arty Bishop and contributors.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.rtbishop.look4sat.core.domain.model
+
+/**
+ * One confirmed satellite QSO as reported by LoTW, kept per worked gridsquare
+ * so the map can show, for any worked grid, which callsigns were worked there
+ * and when.
+ *
+ * @param call      opposite station callsign (as logged by the opposite op)
+ * @param epochMs   QSO date+time in UTC milliseconds
+ * @param satName   satellite name (e.g. "FO-29")
+ * @param mode      ADIF mode (FM / CW / SSB ...)
+ * @param bandUp    uplink band as reported by LoTW (BAND_RX: "70CM", "2M", "10M"...)
+ * @param bandDown  downlink band (BAND: "2M", "70CM"...) — may be empty when
+ *                  LoTW did not include it
+ */
+data class GridQso(
+    val call: String,
+    val epochMs: Long,
+    val satName: String,
+    val mode: String,
+    val bandUp: String,
+    val bandDown: String
+) {
+    /** Short uplink/downlink band label ("U/V", "V/A"), or "" when unknown. */
+    val bandLabel: String
+        get() {
+            val up = bandAbbrev(bandUp)
+            val down = bandAbbrev(bandDown)
+            return when {
+                up.isNotEmpty() && down.isNotEmpty() -> "$up/$down"
+                up.isNotEmpty() -> up
+                else -> ""
+            }
+        }
+
+    private fun bandAbbrev(band: String): String = when (band.trim().uppercase()) {
+        "70CM" -> "U"
+        "2M" -> "V"
+        "10M" -> "A"
+        "6M" -> "V"
+        "1.2G" -> "L"
+        "2.4G" -> "S"
+        "23CM" -> "L"
+        "13CM" -> "S"
+        else -> band.trim().uppercase()
+    }
+}

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/ILoTWRepository.kt

@@ -25,4 +25,14 @@ interface ILoTWRepository {
      * Returns the 4-char grid set, or null on any failure (network / bad credentials).
      */
     suspend fun fetchConfirmedGrids(callsign: String, password: String): Set<String>?
+
+    /**
+     * Same report, but keeps the per-QSO detail of every confirmed satellite
+     * QSO (call / time / satellite / mode / bands), grouped by worked 4-char
+     * gridsquare. Returns null on any failure.
+     */
+    suspend fun fetchConfirmedGridQsos(
+        callsign: String,
+        password: String
+    ): Pair<Set<String>, Map<String, List<com.rtbishop.look4sat.core.domain.model.GridQso>>>?
 }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/repository/ISettingsRepo.kt

@@ -99,6 +99,9 @@ interface ISettingsRepo {
     fun updateWavelogSettings(settings: WavelogSettings)
     fun getWorkedGrids(): Set<String>
     fun setWorkedGrids(grids: Set<String>)
+    /** Confirmed satellite QSOs grouped by worked 4-char gridsquare (map tap detail). */
+    fun getWorkedGridQsos(): Map<String, List<com.rtbishop.look4sat.core.domain.model.GridQso>>
+    fun setWorkedGridQsos(qsos: Map<String, List<com.rtbishop.look4sat.core.domain.model.GridQso>>)
     //endregion
 
     //region # LoTW confirmed-grids settings