Linux app id: ai.storyteller.solidcraft, with an end-of-life rebase from the old id (#619)

The Flatpak app id, desktop/metainfo/MIME file names, icon name and the window's Wayland app_id / X11 class are now ai.storyteller.solidcraft, the id the ArtCraft launcher expects.

Existing Flatpak installs move over: the Pages repo marks app/ai.storyteller.solvecraft end-of-life with a rebase to the new id, so flatpak update offers the switch and Flatpak carries ~/.var/app along. A new install next to the old one copies settings and autosaves on first launch through a read-only grant on the old data folder. The metainfo declares <replaces>/<provides>, the desktop entry X-Flatpak-RenamedFrom, and AppImages drop the menu entry an older AppImage installed. deb/rpm upgrades remove the old-named files.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packaging/env.sh

@@ -37,10 +37,10 @@ export DIST
 
 export SOLIDCRAFT_BUILD_DATE="${SOLIDCRAFT_BUILD_DATE:-${SOLVECRAFT_BUILD_DATE:-$(date -u +%Y-%m-%d)}}"
 export CARGO_TARGET_DIR="${CARGO_TARGET_DIR:-$ROOT/target}"
-# Compatibility shim, see docs/compatibility.md: the reverse-DNS id (Flatpak app id, desktop,
-# metainfo and MIME file names, icon name, Wayland app_id) keeps its pre-rename value so Flatpak
-# installs keep updating and desktop integration keeps working.
-APP_ID=ai.storyteller.solvecraft
+# The reverse-DNS id: Flatpak app id, desktop, metainfo and MIME file names, icon name and the
+# window's Wayland app_id / X11 class. Releases before 0.8 used ai.storyteller.solvecraft; the
+# Flatpak repository rebases that id to this one (packaging/flatpak-site.sh, docs/compatibility.md).
+APP_ID=ai.storyteller.solidcraft
 export APP_ID
 
 # Emit a GitHub Actions warning (plain stderr outside Actions).