fix: add support for kitty mouse leave events

This prevents reporting kitty mouse leave events as spurious mouse clicks.

src/renderer/vaxis/renderer.zig

@@ -323,6 +323,9 @@ pub fn process_renderer_event(self: *Self, msg: []const u8) Error!void {
                     })),
             };
         },
+        .mouse_leave => {
+            if (self.dispatch_event) |f| f(self.handler_ctx, try self.fmtmsg(.{"mouse_leave"}));
+        },
         .focus_in => {
             if (self.dispatch_event) |f| f(self.handler_ctx, try self.fmtmsg(.{"focus_in"}));
         },

src/tui/tui.zig

@@ -389,6 +389,9 @@ fn receive_safe(self: *Self, from: tp.pid_ref, m: tp.message) !void {
         return;
     }
 
+    if (try m.match(.{"mouse_leave"}))
+        return;
+
     if (try m.match(.{"focus_in"}))
         return;