feat(gui): base project

src/app_common/Model.zig

@@ -0,0 +1,14 @@
+const std = @import("std");
+const models = @import("../core/models.zig");
+const Tab = @import("../core/tab/tab.zig").Tab;
+const locked = @import("../core/sync.zig").locked;
+
+running: bool = true,
+usage_number: locked(u16) = .{ .data = 0 },
+current_items: locked(?[]*models.Item) = .{ .data = null },
+current_items_allocator: std.heap.ArenaAllocator,
+tab: *Tab,
+
+pub fn deinit(self: *@This()) void {
+    self.current_items_allocator.deinit();
+}