feat: Show a specific message if requests are rate-limited (#818)

core/network/src/main/kotlin/app/pachli/core/network/retrofit/apiresult/ApiResult.kt

@@ -105,6 +105,7 @@ sealed class ClientError(
                 401 -> Unauthorized(exception)
                 404 -> NotFound(exception)
                 410 -> Gone(exception)
+                429 -> RateLimit(exception)
                 else -> UnknownClientError(exception)
             }
         }
@@ -126,6 +127,10 @@ sealed class ClientError(
     data class Gone(override val exception: HttpException) :
         ClientError(R.string.error_generic_fmt, exception)
 
+    /** 429 Rate limit */
+    data class RateLimit(override val exception: HttpException) :
+        ClientError(R.string.error_429_rate_limit_fmt, exception)
+
     /** All other 4xx client errors */
     data class UnknownClientError(override val exception: HttpException) :
         ClientError(R.string.error_generic_fmt, exception)

core/network/src/main/res/values/strings.xml

@@ -23,6 +23,7 @@
     <string name="server_error_unparseable_version">could not parse \"%1$s\" as a version: %2$s</string>
     <string name="error_generic_fmt">An error occurred: %s</string>
     <string name="error_404_not_found_fmt">Your server does not support this feature: %1$s</string>
+    <string name="error_429_rate_limit_fmt">your server is rate-limiting your requests: %1$s</string>
     <string name="error_json_data_fmt">Your server returned an invalid response: %1$s</string>
     <string name="error_network_fmt">A network error occurred: %s</string>
     <string name="error_missing_content_type_fmt">your server is mis-configured, the response has no content-type: %1$s</string>