feat(panic): panic handler to recover termios when crashing

src/app.zig

@@ -393,6 +393,25 @@ pub fn App(comptime E: type) type {
             }
         }
 
+        pub fn panic_handler(msg: []const u8, _: ?*std.builtin.StackTrace, ret_addr: ?usize) noreturn {
+            terminal.disableMouseSupport() catch {};
+            terminal.exitAltScreen() catch {};
+            terminal.showCursor() catch {};
+            var termios: posix.termios = .{
+                .iflag = .{},
+                .lflag = .{},
+                .cflag = .{},
+                .oflag = .{},
+                .cc = undefined,
+                .line = 0,
+                .ispeed = undefined,
+                .ospeed = undefined,
+            };
+            terminal.disableRawMode(&termios) catch {};
+            terminal.restoreScreen() catch {};
+            std.debug.defaultPanic(msg, ret_addr);
+        }
+
         const element = @import("element.zig");
         pub const Event = mergeTaggedUnions(event.SystemEvent, E);
         pub const Container = @import("container.zig").Container(Event);