fix(flatpak): persist data directory, keep accelerated rendering, and enrich metainfo (#2761)

## Summary

Transfers verified improvements and reviewer feedback from the FlatPark
package review to ArtCraft's first-party Flatpak build:

- **Data Persistence:** Adds `--persist=Artcraft` to `finish-args` in
`flatpak.yml` so user settings, credentials, provider tokens, and local
task SQLite queue stored in `~/Artcraft` persist in
`~/.var/app/ai.artcraft.app/Artcraft` across launches instead of being
discarded on exit.
- **Accelerated Rendering:** Adds `artcraft-wrapper` setting
`WEBKIT_DISABLE_DMABUF_RENDERER="${WEBKIT_DISABLE_DMABUF_RENDERER:-0}"`
and
`WEBKIT_DISABLE_COMPOSITING_MODE="${WEBKIT_DISABLE_COMPOSITING_MODE:-0}"`.
Keeping WebKitGTK's accelerated rendering path enabled prevents
rendering glitches on `org.gnome.Platform//51` while preserving user
override capability.
- **Dependency Checking:** Updates the Flatpak build runtime
verification to inspect the real binary (`/app/bin/artcraft.real`).
- **Enriched AppStream Metainfo:** Updates
`ai.artcraft.app.metainfo.xml` with CC0-1.0 metadata license,
bugtracker/vcs-browser/contact URLs, bulleted feature description,
search keywords, branding colors, hardware display requirements, input
controls, and OARS-1.1 content rating.

## Verification

- `actionlint .github/workflows/*.yml` passed.
- `shellcheck packaging/linux/*.sh packaging/linux/artcraft-wrapper`
passed.
- `xmllint --noout packaging/linux/ai.artcraft.app.metainfo.xml` passed.
- `appstreamcli validate packaging/linux/ai.artcraft.app.metainfo.xml`
passed with 0 errors and 0 info notices.

packaging/linux/README.md

@@ -13,9 +13,10 @@ existing `artcraft-v<version>` draft, retaining Windows and macOS assets. The ve
 Native AppImages also include zsync delta-update metadata.
 
 Flatpak uses native Ubuntu 24.04 runners and GNOME 51 for GTK3/WebKitGTK 4.1. Its build checks
-for missing ELF dependencies inside the sandbox. RISC-V packages require Ubuntu 24.04-era
-libraries; x86_64 and ARM64 use Ubuntu 22.04 as their build baseline. The suite does not publish
-RISC-V AppImages, Arch packages or Flatpaks.
+for missing ELF dependencies inside the sandbox, grants `--persist=Artcraft` so settings and task
+data survive restarts, and provides a launcher wrapper keeping WebKitGTK's accelerated rendering
+path enabled. RISC-V packages require Ubuntu 24.04-era libraries; x86_64 and ARM64 use Ubuntu 22.04
+as their build baseline. The suite does not publish RISC-V AppImages, Arch packages or Flatpaks.
 
 `package.sh <architecture> <rust-target>` normalizes Tauri's DEB/RPM/AppImage filenames and
 extracts the DEB's `/usr` tree into the suite's `bin/` and `share/` tarball layout. Shared Craft

packaging/linux/ai.artcraft.app.metainfo.xml

@@ -2,13 +2,50 @@
 <component type="desktop-application">
   <id>ai.artcraft.app</id>
   <name>ArtCraft Studio</name>
-  <summary>Create AI images and video</summary>
+  <summary>Create images and video with AI</summary>
   <metadata_license>MIT</metadata_license>
   <project_license>MIT OR Apache-2.0</project_license>
-  <description><p>ArtCraft Studio is a desktop workspace for generating AI images and video with connected AI providers.</p></description>
-  <launchable type="desktop-id">ai.artcraft.app.desktop</launchable>
+  <developer id="ai.artcraft">
+    <name>ArtCraft</name>
+  </developer>
   <url type="homepage">https://getartcraft.com</url>
-  <developer id="ai.artcraft"><name>ArtCraft</name></developer>
-  <categories><category>Graphics</category><category>AudioVideo</category></categories>
-  <provides><binary>artcraft</binary></provides>
+  <url type="bugtracker">https://github.com/storytold/artcraft/issues</url>
+  <url type="vcs-browser">https://github.com/storytold/artcraft</url>
+  <url type="contact">https://discord.gg/artcraft</url>
+  <description>
+    <p>ArtCraft Studio is a creative desktop workspace for generating AI images and video with connected AI providers.</p>
+    <ul>
+      <li>Text-to-image and image-to-image creation with state-of-the-art models</li>
+      <li>Video generation and camera motion controls</li>
+      <li>Direct integration with Fal, Grok, Midjourney, Sora, and WorldLabs</li>
+      <li>Local task persistence with an embedded SQLite queue</li>
+    </ul>
+  </description>
+  <launchable type="desktop-id">ai.artcraft.app.desktop</launchable>
+  <categories>
+    <category>Graphics</category>
+    <category>AudioVideo</category>
+  </categories>
+  <keywords>
+    <keyword>ai</keyword>
+    <keyword>image</keyword>
+    <keyword>video</keyword>
+    <keyword>generation</keyword>
+    <keyword>art</keyword>
+  </keywords>
+  <branding>
+    <color type="primary" scheme_preference="light">#2f7bf5</color>
+    <color type="primary" scheme_preference="dark">#1a5bc4</color>
+  </branding>
+  <requires>
+    <display_length compare="ge">760</display_length>
+  </requires>
+  <supports>
+    <control>keyboard</control>
+    <control>pointing</control>
+  </supports>
+  <content_rating type="oars-1.1" />
+  <provides>
+    <binary>artcraft</binary>
+  </provides>
 </component>

packaging/linux/artcraft-wrapper

@@ -0,0 +1,16 @@
+#!/bin/sh
+set -eu
+
+# ArtCraft Studio is a Tauri (WebKitGTK) desktop app.
+#
+# Keep WebKitGTK's accelerated path on, the opposite of the older recipe of
+# disabling the DMABUF renderer. On org.gnome.Platform//51 the unaccelerated
+# path draws this window wrong.
+#
+# ${VAR:-0} rather than plain assignment, so a user whose driver does need the
+# unaccelerated path can take it back:
+#   flatpak override --user --env=WEBKIT_DISABLE_DMABUF_RENDERER=1 ai.artcraft.app
+export WEBKIT_DISABLE_DMABUF_RENDERER="${WEBKIT_DISABLE_DMABUF_RENDERER:-0}"
+export WEBKIT_DISABLE_COMPOSITING_MODE="${WEBKIT_DISABLE_COMPOSITING_MODE:-0}"
+
+exec /app/bin/artcraft.real "$@"

packaging/linux/flatpak.sh

@@ -8,6 +8,7 @@ trap 'rm -rf "$work"' EXIT
 mkdir -p "$work/stage" dist/release
 tar -xzf "dist/linux/$base.tar.gz" --strip-components=1 -C "$work/stage"
 cp packaging/linux/flatpak.yml "$work/manifest.yml"
+cp packaging/linux/artcraft-wrapper "$work/artcraft-wrapper"
 flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
 sign=()
 keys=()
@@ -21,7 +22,7 @@ flatpak-builder --user --install-deps-from=flathub --disable-rofiles-fuse --forc
 # Fail on missing WebKitGTK or other runtime libraries rather than shipping an unloadable binary.
 # shellcheck disable=SC2016 # Expand these variables inside the Flatpak runtime shell.
 flatpak build --runtime "$work/build" sh -c '
-  dependencies=$(ldd /app/bin/artcraft) || exit 1
+  dependencies=$(ldd /app/bin/artcraft.real) || exit 1
   printf "%s\n" "$dependencies"
   case "$dependencies" in *"not found"*) exit 1 ;; esac
 '

packaging/linux/flatpak.yml

@@ -13,6 +13,9 @@ finish-args:
   - --filesystem=xdg-pictures
   - --filesystem=xdg-videos
   - --filesystem=xdg-download
+  # The app hardcodes its data to ~/Artcraft (settings, credentials, state).
+  # Persist it under ~/.var/app/ai.artcraft.app/Artcraft so data survives exits.
+  - --persist=Artcraft
 modules:
   - name: artcraft
     buildsystem: simple
@@ -20,6 +23,10 @@ modules:
       - cp -a . /app/
       - install -Dm644 /app/share/icons/hicolor/128x128/apps/artcraft.png /app/share/icons/hicolor/128x128/apps/ai.artcraft.app.png
       - sed -i 's/^Icon=.*/Icon=ai.artcraft.app/' /app/share/applications/ai.artcraft.app.desktop
+      - mv /app/bin/artcraft /app/bin/artcraft.real
+      - install -Dm755 artcraft-wrapper /app/bin/artcraft
     sources:
       - type: dir
         path: stage
+      - type: file
+        path: artcraft-wrapper