docs: README for Lotus Chat desktop, not upstream Cinny (#35)

The README was upstream's: its download buttons and minisign key pointed
at cinnyapp releases, so following it installed upstream Cinny and
verified it against the wrong key. Point downloads at this repo's
releases (NSIS exe, .deb, pacman package, AppImage), publish Lotus'
updater key, and list the desktop features.

Fixes #35

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

README.md

@@ -1,39 +1,69 @@
-# Cinny desktop
+# Lotus Chat desktop
 
-<a href="https://github.com/cinnyapp/cinny-desktop/releases">
+The desktop app for [Lotus Chat](https://chat.lotusguild.org), Lotus Guild's
-  <img alt="GitHub release downloads" src="https://img.shields.io/github/downloads/cinnyapp/cinny-desktop/total?style=social"></a>
+Matrix client (a fork of [Cinny](https://github.com/cinnyapp/cinny)), built
-
+with [Tauri](https://v2.tauri.app/). The web client lives in the `cinny/`
-Cinny is a matrix client focusing primarily on simple, elegant and secure interface. The desktop app is made with Tauri.
+submodule ([LotusGuild/cinny](https://code.lotusguild.org/LotusGuild/cinny)).
 
 ## Download
 
-Installers for macOS, Windows and Linux can be downloaded from [Github releases](https://github.com/cinnyapp/cinny-desktop/releases). Releases are signed with a [Ed25519](https://ed25519.cr.yp.to/) public-key.
+Builds are published on this repo's releases page:
+**https://code.lotusguild.org/LotusGuild/cinny-desktop/releases/latest**
 
-Operating System | Download
+| Platform | File |
----|---
+|---|---|
-Windows | <a href='https://github.com/cinnyapp/cinny-desktop/releases/latest/download/Cinny_desktop-x86_64.msi'>Get it on Windows</a>
+| Windows | `LotusChat-x86_64-setup.exe` (NSIS installer) |
-macOS | <a href='https://github.com/cinnyapp/cinny-desktop/releases/latest/download/Cinny_desktop-universal.dmg'>Get it on macOS</a>
+| Debian / Ubuntu | `LotusChat-x86_64.deb`, install with `sudo apt install ./LotusChat-x86_64.deb` |
-Linux | <a href='https://github.com/cinnyapp/cinny-desktop/releases/latest/download/Cinny_desktop-x86_64.AppImage'>Get it on Linux</a> · <a href='https://flathub.org/apps/details/in.cinny.Cinny'>Flatpak</a>
+| Arch | `LotusChat-x86_64.pkg.tar.zst`: download it, then `sudo pacman -U LotusChat-x86_64.pkg.tar.zst` |
+| Other Linux | `LotusChat-x86_64.AppImage` |
 
-Decoded public key:
+There is no macOS build at the moment.
-> RWRflTUQD3RHFtn25QNANCmePR9+4LSK89kAKTMEEB4OKpOFpLMgc64z
 
-To verify release files, you need to download [minisign](https://jedisct1.github.io/minisign/) tool and [decode](https://www.base64decode.org/) the *.sig* file before running:
+### Updates and signatures
->  minisign -Vm ***RELEASE_FILE.msi.zip*** -P RWRflTUQD3RHFtn25QNANCmePR9+4LSK89kAKTMEEB4OKpOFpLMgc64z -x ***SINGATURE.msi.zip.sig***
+
+The app updates itself from
+`https://code.lotusguild.org/LotusGuild/cinny-desktop/releases/download/latest/release.json`.
+Updater bundles (`.nsis.zip`, `.AppImage.tar.gz`) are signed with minisign; the
+`.sig` files sit next to them. Lotus Chat's public key (the base64-decoded
+`plugins.updater.pubkey` in `src-tauri/tauri.conf.json`):
+
+> RWRZZdyii05/NUcz337A5SAbiZK+NPVDWuiL2mM5Jk1p/LfRmNfiZ/6l
+
+To check a bundle by hand, base64-decode its `.sig` file and run
+`minisign -Vm LotusChat-x86_64-setup.nsis.zip -P RWRZZdyii05/NUcz337A5SAbiZK+NPVDWuiL2mM5Jk1p/LfRmNfiZ/6l -x <decoded.sig>`.
+
+Packages installed through apt or pacman are updated by downloading the new
+package from the releases page; the in-app updater says so instead of
+replacing files it doesn't own.
+
+## Desktop features
+
+Beyond the web client:
+
+- **Tray:** unread, call and update state; Do Not Disturb.
+- **Launch on login**, with an optional **start minimized**.
+- **Closing the window:** asks once whether to keep running in the tray or
+  quit. A call in progress always goes to the tray.
+- **Taskbar / launcher:** unread badge, attention flash, upload progress.
+- **Windows:** rich notifications with Reply and Mark as read, Focus Assist
+  sync, thumbnail toolbar (mute / deafen / end call), jump list, media keys (SMTC).
+- **System-wide push-to-talk and deafen** keys that work while another app
+  (a game) has focus.
+- **Keychain:** a copy of your login is kept in the OS keychain.
+- **Calls:** the call page runs on its own loopback origin, with WebView
+  permissions scoped to it; where the WebView has no WebRTC (Linux
+  WebKitGTK), "Open in browser" instead of a dead end.
+- **Linux:** NVIDIA / Wayland rendering workarounds.
 
 ## Local development
 
-Firstly, to setup Rust, NodeJS and build tools follow [Tauri documentation](https://v2.tauri.app/start/prerequisites/).
+Set up Rust, Node.js and the build tools per the
+[Tauri prerequisites](https://v2.tauri.app/start/prerequisites/), then:
 
-Now, to setup development locally run the following commands:
+```sh
-* `git clone --recursive https://github.com/cinnyapp/cinny-desktop.git`
+git clone --recursive https://code.lotusguild.org/LotusGuild/cinny-desktop.git
-* `cd cinny-desktop/cinny`
+cd cinny-desktop/cinny && npm ci && cd ..
-* `npm ci`
+npm ci
-* `cd ..`
+npm run tauri dev     # development
-* `npm ci`
+npm run tauri build   # release build
-
+```
-To build the app locally, run:
-* `npm run tauri build`
-
-To start local dev server, run:
-* `npm run tauri dev`