gtk: flatpak manifest

gtk/flatpak/README.md

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+# Flatpak (GTK client)
+
+This builds the GTK client as a Flatpak **assuming `kordophoned` is installed on the host**
+and reachable on the **session bus** as `net.buzzert.kordophonecd`.
+
+## Build
+
+```bash
+cd gtk
+make flatpak
+```
+
+## Install (user)
+
+```bash
+cd gtk
+make flatpak-install
+```

gtk/flatpak/net.buzzert.kordophone.yml

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+app-id: net.buzzert.kordophone
+runtime: org.gnome.Platform
+runtime-version: "48"
+sdk: org.gnome.Sdk
+command: kordophone
+
+finish-args:
+  - --share=ipc
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --device=dri
+  # Talk to the host-installed daemon (option A).
+  - --socket=session-bus
+  - --talk-name=net.buzzert.kordophonecd
+  # libsecret (Secret Service) access for stored credentials.
+  - --talk-name=org.freedesktop.secrets
+
+modules:
+  - name: kordophone
+    buildsystem: meson
+    config-opts:
+      - --prefix=/app
+    sources:
+      - type: dir
+        path: ..