feat: mutual pass FM/Linear transponder filters (AMSAT Live source)

Mutual match page gains FM/Linear transponder-type filters. The
authoritative source is AMSAT's human-maintained Live FM/Linear
Satellites pages, fetched during data sync and stored as catnum sets;
filters resolve to those sets (falling back to DB mode filter when
empty), and unchecking both shows a prompt instead of querying.

- DataParser.parseAmSatLivePage: table rows to satellite names,
  TEVEL2-1 thru TEVEL2-9 range expansion, bracket-alias matching
- SettingsRepo: AMSAT FM/Linear catnum sets persisted in prefs
- DatabaseRepo: fetch AMSAT pages in updateFromRemote, best-effort
  (failure keeps previous list, never blocks the update)
- getIdsWithModes: AND isAlive = 1
- MutualScreen: FilterChip row inside MatchSearchCard
- Tests: parser (4) + viewmodel (3) + repo fakes

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

@@ -65,4 +65,9 @@ interface ISatelliteRepo {
 
     /** Fetch radio transceivers for a satellite by its catalog number. */
     suspend fun getRadiosWithId(id: Int): List<SatRadio>
+
+    /** Satellite catnums whose radios carry any of the given downlink modes.
+     *  Empty modes -> empty result; used to filter the mutual-match satellite
+     *  set to transponder satellites (FM voice / linear). */
+    suspend fun getSatelliteIdsWithModes(modes: List<String>): List<Int>
 }

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

@@ -79,6 +79,14 @@ interface ISettingsRepo {
     fun updateDataSourcesStatus(status: Map<String, Int>)
     //endregion
 
+    //region # AMSAT live-transponder lists
+    /** Catalog numbers of satellites listed on AMSAT's "Live FM Satellites" page. */
+    fun getAmSatFmCatnums(): Set<Int>
+    /** Catalog numbers of satellites listed on AMSAT's "Live Linear Satellites" page. */
+    fun getAmSatLinearCatnums(): Set<Int>
+    fun setAmSatCatnums(fmCatnums: Set<Int>, linearCatnums: Set<Int>)
+    //endregion
+
     //region # Radio control settings
     val radioControlSettings: StateFlow<RadioControlSettings>
     fun updateRadioControlSettings(settings: RadioControlSettings)

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/source/Sources.kt

@@ -55,4 +55,11 @@ object Sources {
         "SatNOGS" to "https://db.satnogs.org/api/transmitters/?format=json&status=active",
         "R4UAB" to "https://r4uab.ru/transmitters.json"
     )
+    /** AMSAT "Live FM/Linear Satellites" pages: human-maintained lists of
+     *  transponders currently on the air. Parsed into the mutual-match filter
+     *  (satellites that actually carry a working FM-voice / linear repeater). */
+    val amSatLiveUrls = mapOf(
+        "FM" to "https://www.amsat.org/live-fm-satellites/",
+        "Linear" to "https://www.amsat.org/live-linear-satellites/"
+    )
 }

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/utility/DataParser.kt

@@ -58,6 +58,82 @@ class DataParser(private val dispatcher: CoroutineDispatcher) {
         }.getOrDefault(emptyList())
     }
 
+    /**
+     * Parse an AMSAT "Live FM/Linear Satellites" page into satellite names.
+     * The page is an HTML table whose first column is the satellite name,
+     * sometimes written as an alias list ("AO-91(RadFxSat / Fox-1B)") or a
+     * range ("TEVEL2-1 thru TEVEL2-9"). Returns the distinct expanded names.
+     */
+    suspend fun parseAmSatLivePage(stream: InputStream): List<String> = withContext(dispatcher) {
+        runCatching {
+            val html = stream.bufferedReader().readText()
+            // Grab table rows, take the first cell of each row, keep rows that
+            // look like satellite names (start with letters/digits, not a header).
+            val rows = Regex("<tr[^>]*>(.*?)</tr>", RegexOption.IGNORE_CASE)
+                .findAll(html)
+                .mapNotNull { match ->
+                    val cells = Regex("<t[dh][^>]*>(.*?)</t[dh]>", RegexOption.IGNORE_CASE)
+                        .findAll(match.groupValues[1])
+                        .map { cell -> stripHtml(cell.groupValues[1]).trim() }
+                        .toList()
+                    cells.firstOrNull()?.takeIf { it.isNotBlank() && !it.equals("Satellite", ignoreCase = true) }
+                }
+                .toList()
+            rows.flatMap { expandNameRange(it) }.distinct()
+        }.getOrDefault(emptyList())
+    }
+
+    private fun stripHtml(raw: String): String =
+        raw.replace(Regex("<[^>]+>"), " ").replace(Regex("\\s+"), " ").trim()
+
+    /** Expand "NAME1 thru NAME9" ranges (e.g. TEVEL2-1 thru TEVEL2-9). */
+    private fun expandNameRange(name: String): List<String> {
+        val m = Regex("^(.*?)(\\d+)\\s+thru\\s+(.*?)(\\d+)$", RegexOption.IGNORE_CASE).find(name)
+        if (m == null) return listOf(name)
+        val prefix1 = m.groupValues[1].trim()
+        val startNum = m.groupValues[2].toIntOrNull() ?: return listOf(name)
+        val endNum = m.groupValues[4].toIntOrNull() ?: return listOf(name)
+        val prefix2 = m.groupValues[3].trim()
+        if (startNum > endNum) return listOf(name)
+        // Suffix after the end number, if any (e.g. "TEVEL2-1 thru TEVEL2-9 ").
+        val suffix = name.substringAfterLast(m.groupValues[4]).trim()
+        return (startNum..endNum).map { "$prefix1$it$suffix" }
+    }
+
+    /**
+     * Normalize a satellite name from the AMSAT live pages into lookup keys
+     * used to match against the local entries table:
+     *  - primary key: the leading designator ("AO-91" from "AO-91 (RadFxSat / Fox-1B)")
+     *  - alias keys: every bracketed alias, uppercased, digits preserved
+     * The local entry names are normalized the same way in [matchesAmSatName].
+     */
+    fun normalizeAmSatName(name: String): List<String> {
+        val keys = mutableListOf<String>()
+        // Primary: everything before the first '(' (or '['), then the first token.
+        val primary = name.substringBefore('(').substringBefore('[').trim()
+        primary.split(Regex("\\s+")).firstOrNull()?.takeIf { it.isNotBlank() }?.let {
+            keys += it.uppercase()
+        }
+        // Aliases inside parentheses / brackets: "RadFxSat / Fox-1B" -> two keys.
+        Regex("\\(([^)]*)\\)").findAll(name).forEach { m ->
+            m.groupValues[1].split('/', '|').forEach { alias ->
+                alias.trim().takeIf { it.isNotBlank() }?.let { keys += it.uppercase() }
+            }
+        }
+        Regex("\\[([^]]*)]").findAll(name).forEach { m ->
+            m.groupValues[1].split('/', '|').forEach { alias ->
+                alias.trim().takeIf { it.isNotBlank() }?.let { keys += it.uppercase() }
+            }
+        }
+        return keys.distinct()
+    }
+
+    /** True if a local entry name matches any of the AMSAT normalized keys. */
+    fun matchesAmSatName(localName: String, amSatKeys: List<String>): Boolean {
+        val localUpper = localName.uppercase()
+        return amSatKeys.any { key -> localUpper.contains(key) }
+    }
+
     private fun parseCSV(values: List<String>): OrbitalData? = runCatching {
         val name = values[0]
         val timestamp = values[2]

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/DataParserTest.kt

@@ -239,4 +239,51 @@ class DataParserTest {
         // Matches the CSV test data epoch: 2021-11-16 → day 320
         assert(dataParser.getDayOfYear(2021, 11, 16) == 320)
     }
+
+    @Test
+    fun `AMSAT FM page parses satellite names and expands thru ranges`() = runTest(testDispatcher) {
+        val html = """
+            <html><body><table>
+            <tr><th>Satellite</th><th>Uplink</th><th>Downlink</th><th>Comment</th></tr>
+            <tr><td>AO-91(RadFxSat / Fox-1B)</td><td>435.250</td><td>145.960</td></tr>
+            <tr><td>SO-50(SaudiSat-1C)</td><td>145.850</td><td>436.795</td></tr>
+            <tr><td>TEVEL2-1 thru TEVEL2-9</td><td>145.970</td><td>436.400</td></tr>
+            </table></body></html>
+        """.trimIndent().byteInputStream()
+        val names = dataParser.parseAmSatLivePage(html)
+        assert(names.contains("AO-91(RadFxSat / Fox-1B)"))
+        assert(names.contains("SO-50(SaudiSat-1C)"))
+        assert(names.contains("TEVEL2-1"))
+        assert(names.contains("TEVEL2-9"))
+        assert(names.size == 11) // 2 singles + 9 expanded TEVEL2
+    }
+
+    @Test
+    fun `AMSAT linear page keeps mode-suffixed names`() = runTest(testDispatcher) {
+        val html = """
+            <table>
+            <tr><th>Satellite</th><th>Frequencies</th><th>Comment</th></tr>
+            <tr><td>AO-7 Mode B U/v Inverting Analog</td><td>Uplink LSB</td></tr>
+            <tr><td>FO-29 (JAS-2)V/u Inverting Analog</td><td>Uplink LSB</td></tr>
+            </table>
+        """.trimIndent().byteInputStream()
+        val names = dataParser.parseAmSatLivePage(html)
+        assert(names.contains("AO-7 Mode B U/v Inverting Analog"))
+        assert(names.contains("FO-29 (JAS-2)V/u Inverting Analog"))
+    }
+
+    @Test
+    fun `AMSAT name normalization produces primary and alias keys`() {
+        assert(dataParser.normalizeAmSatName("AO-91(RadFxSat / Fox-1B)") == listOf("AO-91", "RADFXSAT", "FOX-1B"))
+        assert(dataParser.normalizeAmSatName("QO-100 (Es'hail-2/P4A) S/x") == listOf("QO-100", "ES'HAIL-2", "P4A"))
+        assert(dataParser.normalizeAmSatName("ISS") == listOf("ISS"))
+        assert(dataParser.matchesAmSatName("AO-91 (RADFXSAT)", listOf("AO-91", "RADFXSAT")))
+        assert(!dataParser.matchesAmSatName("SO-50", listOf("AO-91")))
+    }
+
+    @Test
+    fun `AMSAT live page with no table returns empty`() = runTest(testDispatcher) {
+        val html = "<html><body>No data</body></html>".byteInputStream()
+        assert(dataParser.parseAmSatLivePage(html).isEmpty())
+    }
 }

core/domain/src/test/java/com/rtbishop/look4sat/core/domain/repository/LoTWGridSyncTest.kt

@@ -283,6 +283,9 @@ class LoTWGridSyncTest {
         override fun updateOtherSettings(transform: (OtherSettings) -> OtherSettings) = TODO()
         override fun updateDataSourcesSettings(settings: DataSourcesSettings) = TODO()
         override fun updateDataSourcesStatus(status: Map<String, Int>) = TODO()
+        override fun getAmSatFmCatnums(): Set<Int> = emptySet()
+        override fun getAmSatLinearCatnums(): Set<Int> = emptySet()
+        override fun setAmSatCatnums(fmCatnums: Set<Int>, linearCatnums: Set<Int>) = Unit
         override fun updateRadioControlSettings(settings: RadioControlSettings) = TODO()
         override fun getSatelliteOffset(catnum: Int): String = ""
         override fun setSatelliteOffset(catnum: Int, offset: String) = TODO()