docs: show the app in the README with screenshots

[Siddhesh2377]

The README explained the app in detail but never showed it. This adds two captures at the top, with a line each saying what they show.

Both taken on macOS with Qwen3.5 0.8B loaded through the llamacpp backend, and the README says so.

• Chat, the default view: header names the loaded model, footer states that inference runs locally.
• Models, listing what is on disk and what can be pulled, grouped by embeddings and language, with sizes.

Nothing else in the body changed. It was already accurate.

Why only two

I captured a third showing a real conversation with tool calling, where the assistant answered a "current time" query correctly. It is not included, because it renders two defects that would be the most eye-catching thing in the image:

1. Every persisted chat in the sidebar shows "Invalid Date". A chat created in the same session shows "43m ago" correctly, so it is the stored-timestamp parse rather than the formatter.
2. Assistant messages show "undefined tokens" below the reply, where the token count belongs.

Both look like small fixes. Once they land, the chat capture is the best screenshot the app has and should go in as the first image.

I also could not reach the Advanced pane. Synthetic clicks land on Chat and Models but never on Advanced, across several attempts and after correcting for the window moving. That may be worth a look on its own, since it suggests the item does not respond to a plain click event the way its siblings do.

[coderabbitai]

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[Siddhesh2377]

Superseded by #16, which now carries the README alongside the app changes it describes. Keeping one PR per repo.