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 <noreply@anthropic.com>

packaging/linux/flatpak-bundle.sh

@@ -12,7 +12,7 @@
 # installed per-user from Flathub. Unless --no-test, the bundle is installed per-user, the CLI
 # is checked, and the desktop creates/measures a box on headless X11 and Wayland. The desktop
 # check also needs python3, dbus-x11, xvfb, xauth and weston; no screenshots are produced.
-# Manifest: packaging/linux/flatpak/ai.storyteller.solvecraft.bundle.yml.
+# Manifest: packaging/linux/flatpak/ai.storyteller.solidcraft.bundle.yml.
 # Adapted from PhotoCraft's (storytold/photocraft, Apache-2.0; see ATTRIBUTION.md).
 set -euo pipefail
 # shellcheck source=../env.sh