Desktop client (warp-desktop) with Wails v3

apps/desktop is the web client in a native window. It embeds the same
build warp-web does and serves it through the same Go package, so every
screen is shared. Unlike warp-web it proxies nothing: the client calls the
homeserver directly, and the CSP allows the homeserver plus any https:
and wss: origin for the call backend.

- First run asks for the homeserver: a server name or address, with
  .well-known discovery and a /versions check; File > Change homeserver
  asks again. Signed-in sessions keep their own base URL, so a change
  never sends one server's token to another.
- Links to other sites open in the system browser (/_desktop/links.js,
  added to index.html); only http, https and mailto are opened.
- One instance at a time, since sessions and keys live in the webview's
  storage.
- Dev builds open the DevTools Protocol on Windows when
  WARP_DESKTOP_REMOTE_DEBUGGING_PORT is set, for scripted testing.
- Packaging: icon, version info and manifest in the Windows exe, a macOS
  .app with camera and microphone descriptions, Linux packages via nfpm.
  Make targets: desktop, desktop-run, desktop-test, desktop-resources,
  desktop-macos, desktop-linux.

Web client: host and client move out of internal/ so the desktop app can
import them, and host gains AnyCallOrigin. The Dockerfile, .dockerignore
and the vite output path follow the move.

Pinned to Wails v3.0.0-beta.27.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/build/linux/nfpm.yaml

@@ -0,0 +1,45 @@
+# Linux packages (deb, rpm, Arch) for warp-desktop, built by
+# `make desktop-linux` with `wails3 tool package`, which runs nfpm
+# (https://nfpm.goreleaser.com). Paths are relative to apps/desktop.
+# VERSION, GOARCH and MAINTAINER come from the Makefile.
+
+name: warp-desktop
+arch: ${GOARCH}
+platform: linux
+version: ${VERSION}
+release: "1"
+section: net
+priority: optional
+maintainer: ${MAINTAINER}
+description: |
+  Warp, a Matrix client: the Warp web client in a native window.
+
+contents:
+  - src: ../../bin/warp-desktop
+    dst: /usr/bin/warp-desktop
+    file_info:
+      mode: 0755
+  - src: ./build/linux/warp-desktop.desktop
+    dst: /usr/share/applications/warp-desktop.desktop
+  - src: ./cmd/warp-desktop/appicon.png
+    dst: /usr/share/icons/hicolor/256x256/apps/warp-desktop.png
+  - src: ./build/appicon.png
+    dst: /usr/share/icons/hicolor/1024x1024/apps/warp-desktop.png
+
+scripts:
+  postinstall: ./build/linux/postinstall.sh
+
+# Wails v3 builds against GTK 4 and WebKitGTK 6.0 by default
+# (Ubuntu 24.04+, Debian 13+, Fedora 40+).
+depends:
+  - libgtk-4-1
+  - libwebkitgtk-6.0-4
+overrides:
+  rpm:
+    depends:
+      - gtk4
+      - webkitgtk6.0
+  archlinux:
+    depends:
+      - gtk4
+      - webkitgtk-6.0

apps/desktop/build/linux/postinstall.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Make the menu entry and icon show up without logging out.
+if command -v update-desktop-database >/dev/null 2>&1; then
+  update-desktop-database -q /usr/share/applications || true
+fi
+if command -v gtk-update-icon-cache >/dev/null 2>&1; then
+  gtk-update-icon-cache -q -t /usr/share/icons/hicolor || true
+fi
+exit 0

apps/desktop/build/linux/warp-desktop.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=Warp
+Comment=A Matrix client
+Exec=/usr/bin/warp-desktop
+Icon=warp-desktop
+Terminal=false
+Categories=Network;InstantMessaging;Chat;