Add auto refresh every minute

src/departure.zig

@@ -15,7 +15,10 @@ fn fetchThread(state: *AppState) !void {
     defer curl.deinit();
 
     while (state.departure_screen_state.fetch_thread != null) {
-        const fetch_anyway = state.departure_screen_state.should_refresh;
+        var fetch_anyway = state.departure_screen_state.should_refresh;
+        if (state.departure_screen_state.last_refresh_time + 60000 < std.time.milliTimestamp()) {
+            fetch_anyway = true;
+        }
         if (!fetch_anyway and std.mem.eql(u8, station_id_buf.slice(), state.departure_screen_state.station_id.items) and include_tram == state.departure_screen_state.include_tram) {
             std.time.sleep(100 * 1000);
             continue;
@@ -64,6 +67,7 @@ fn fetchThread(state: *AppState) !void {
         }
         state.departure_screen_state.fetch_result = parsed;
         state.departure_screen_state.should_refresh = false;
+        state.departure_screen_state.last_refresh_time = std.time.milliTimestamp();
     }
     if (state.departure_screen_state.fetch_result) |old_result| {
         old_result.deinit();

src/state.zig

@@ -29,7 +29,7 @@ pub const DepartureScreenState = struct {
     platform: std.ArrayListUnmanaged(u8),
     departure_date: std.time.Instant,
     fetch_thread: ?std.Thread = null,
-    last_refresh_time: std.time.Instant = std.mem.zeroInit(std.time.Instant, .{}),
+    last_refresh_time: i64 = 0,
     fetch_result: ?std.json.Parsed(std.json.Value) = null,
     should_refresh: bool = false,
     max_next_trains: c_int = 5,