mod(Render): fullscreen option as comptime configuration through App(..)

src/main.zig

@@ -2,8 +2,11 @@ const std = @import("std");
 const terminal = @import("terminal.zig");
 const zlog = @import("zlog");
 
-const App = @import("app.zig").App(union(enum) {});
-const Renderer = @import("render.zig").PlainRenderer();
+const App = @import("app.zig").App(
+    union(enum) {},
+    @import("render.zig").PlainRenderer,
+    true,
+);
 const Key = @import("key.zig");
 
 pub const std_options = zlog.std_options;
@@ -23,20 +26,16 @@ pub fn main() !void {
     const allocator = gpa.allocator();
 
     var app: App = .{};
-    var renderer: Renderer = .{};
+    var renderer: App.Renderer = .{};
 
     var rawText = App.Widget.RawText.init(allocator);
     const widget = App.Widget.createFrom(&rawText);
     var layout = App.Layout.Pane.init(allocator, widget);
-    defer layout.deinit();
+    defer layout.deinit(); // deinitializes the contained widget
 
     try app.start();
     defer app.stop() catch unreachable;
 
-    // NOTE: necessary for fullscreen tui applications
-    try terminal.enterAltScreen();
-    defer terminal.existAltScreen() catch unreachable;
-
     // App.Event loop
     while (true) {
         const event = app.nextEvent();