docs(site): per-app profiles are still marked Coming soon

## Problem

The current homepage still labels **Per-app profiles** as **Coming soon** and says that they "ship in a later release":

> Per-app profiles Coming soon
>
> Per-application overlays that switch the moment your focused app does. Ships in a later release.

That no longer matches the current product. The latest release is v0.8.3, and its tagged tree already contains the per-application profile UI and foreground-application watcher. The repository README also lists per-application profile overlays as available on macOS and Windows, with Linux support on X11 / XWayland.

## Where

- https://openlogi.org/ — Features section
- Verified against release https://github.com/AprilNEA/OpenLogi/releases/tag/v0.8.3

## Expected

Describe per-app profiles as an available feature and state the actual platform boundary, for example:

> **Per-app profiles**
>
> Switch button mappings automatically with the focused application on macOS and Windows, and on Linux under X11 / XWayland.

## Notes

The website is served by a separate Cloudflare/Next.js deployment and its source is not present in this repository, so I could not submit a focused source patch here. I searched existing issues and pull requests for the website/profile wording before filing this.

Start with the Features section on https://openlogi.org/ and compare its Per-app profiles wording with the v0.8.3 release and repository README. The website source is not in this repository, so identify the separate Cloudflare/Next.js deployment or its owner before making a change. Done means the feature is presented as available with the macOS, Windows, and Linux X11/XWayland boundary stated accurately.

Written by the indexing model from the issue text.