Devlog 05 — Adding more tools and loading feedback

I expanded Toolbox from seven tools to ten.

The new tools are a basic calculator, a random picker, and a habit tracker. The calculator handles basic arithmetic, decimals, clearing, backspace, and divide-by-zero handling.

The random picker accepts one option per line and chooses one result. The habit tracker stores a habit name and marks progress across the last seven days.

I also added a visible skeleton loader when opening a modal. The loading state is short, but it gives the interface a clear transition instead of making the tool appear abruptly.

The habit tracker still works without an account by using local browser storage.