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

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/UpdateRepository.kt

@@ -16,15 +16,21 @@ class UpdateRepository(
         // the API endpoint is rate-limited to 60 requests/hour per IP, which is
         // quickly exhausted on shared egress IPs (e.g. VPN proxies), causing 403
         // failures. The web endpoint redirects to the latest tag with no such limit.
-        val result = remoteSource.getNetworkStream(LATEST_RELEASE_URL)
-        val stream = result.stream ?: return@withContext null
-        try {
-            val html = stream.bufferedReader().use { it.readText() }
-            parseRelease(html)
-        } catch (e: Exception) {
-            println("UpdateRepository parse failure: $e")
-            null
+        // When GitHub is unreachable (common on mainland-China networks without a
+        // proxy), fall back to community GitHub accelerator mirrors that proxy the
+        // same page; each mirror resolves the identical tag and asset URLs.
+        for (baseUrl in LATEST_RELEASE_URLS) {
+            val result = remoteSource.getNetworkStream(baseUrl)
+            val stream = result.stream ?: continue
+            val parsed = try {
+                parseRelease(stream.bufferedReader().use { it.readText() }, baseUrl)
+            } catch (e: Exception) {
+                println("UpdateRepository parse failure: $e")
+                null
+            }
+            if (parsed != null) return@withContext parsed
         }
+        null
     }
 
     override suspend fun downloadApk(url: String, dest: File): Boolean = withContext(Dispatchers.IO) {
@@ -40,7 +46,7 @@ class UpdateRepository(
         }
     }
 
-    private fun parseRelease(html: String): LatestRelease? {
+    private fun parseRelease(html: String, sourceUrl: String): LatestRelease? {
         // The redirect target is the latest release's tag page. Extract the tag
         // from the og:url meta tag ("…/releases/tag/v4.4.6-ba7opf.8") — stable and
         // unambiguous. The <title> also holds the release name, but that is free
@@ -53,8 +59,16 @@ class UpdateRepository(
             .find(html)?.groupValues?.get(1)?.trim()
             ?.substringBefore("·")?.removePrefix("Release")?.trim() ?: tag
         // The release APK asset follows the fixed naming scheme used by the build:
-        // Look4Sat-<tag without leading v>-release.apk
-        val apkUrl = "$DOWNLOAD_BASE_URL/$tag/Look4Sat-${tag.removePrefix("v")}-release.apk"
+        // Look4Sat-<tag without leading v>-release.apk. When the page was fetched
+        // through an accelerator mirror (https://<mirror>/https://github.com/...),
+        // download through the same mirror — raw github.com is unreachable on the
+        // networks that needed the mirror in the first place.
+        val mirrorPrefix = sourceUrl.substringBefore("https://github.com")
+        val apkUrl = if (mirrorPrefix.isEmpty()) {
+            "$DOWNLOAD_BASE_URL/$tag/Look4Sat-${tag.removePrefix("v")}-release.apk"
+        } else {
+            "${mirrorPrefix}https://github.com/atsunatsu/Look4Sat/releases/download/$tag/Look4Sat-${tag.removePrefix("v")}-release.apk"
+        }
         return LatestRelease(
             versionTag = tag,
             title = title,
@@ -65,8 +79,18 @@ class UpdateRepository(
 
     private companion object {
         // Web pages are used instead of api.github.com to avoid the 60 req/hour
-        // anonymous rate limit (see getLatestRelease above).
-        const val LATEST_RELEASE_URL = "https://github.com/atsunatsu/Look4Sat/releases/latest"
+        // anonymous rate limit (see getLatestRelease above). The GitHub URL is
+        // tried first; if it is unreachable (no proxy on mainland networks) the
+        // accelerator mirrors are tried in order. Download URLs always point at
+        // the mirrors too — raw github.com release downloads are equally blocked
+        // without a proxy, so a mirror-resolved tag must be downloaded via the
+        // same mirror.
+        val LATEST_RELEASE_URLS = listOf(
+            "https://github.com/atsunatsu/Look4Sat/releases/latest",
+            "https://ghfast.top/https://github.com/atsunatsu/Look4Sat/releases/latest",
+            "https://gh.llkk.cc/https://github.com/atsunatsu/Look4Sat/releases/latest",
+            "https://github.moeyy.xyz/https://github.com/atsunatsu/Look4Sat/releases/latest"
+        )
         const val DOWNLOAD_BASE_URL = "https://github.com/atsunatsu/Look4Sat/releases/download"
     }
 }