nextcloud: fix GTK module warning, Qt session error, skip KWallet on non-KDE

cinnamon_fullsetup.cfg: add xapps package so the xapp-gtk3-module GTK
module referenced in Cinnamon's GTK settings is present for Flatpak apps.

user_run.sh: pass --setenv=SESSION_MANAGER= to systemd-run so Qt does not
try to connect to an X11 session manager socket that may not exist (fixes
"Could not open network socket" on Wayland and non-KDE desktops).
Guard the KWallet D-Bus block behind a session-bus presence check
(qdbus | grep org.kde.kwalletd) so it is skipped entirely on Cinnamon and
other non-KDE desktops instead of producing D-Bus errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client_software/0050_nextcloud_desktopclient/user_run.sh

@@ -102,6 +102,9 @@ for i in {0..99}; do
         NC_WALLET_APPID="logon_script"
         NC_QB_CMD="qdbus-qt6"
         if ! command -v ${NC_QB_CMD} >/dev/null 2>&1; then NC_QB_CMD="qdbus"; fi
+        # Only attempt KWallet on KDE: check that the service is registered on the session bus.
+        if command -v "${NC_QB_CMD}" >/dev/null 2>&1 && \
+           "${NC_QB_CMD}" 2>/dev/null | grep -q "org.kde.kwalletd"; then
             NC_QB_SVC="org.kde.kwalletd"
             NC_QB_PATH="/modules/kwalletd6"
             if ! ( ${NC_QB_CMD} "${NC_QB_SVC}" | grep -q "${NC_QB_PATH}" ); then
@@ -122,6 +125,9 @@ for i in {0..99}; do
             else
                 echo "Warning: Could not open KWallet (handle: ${NC_WALLET_HANDLE}). Nextcloud may prompt for credentials on next start."
             fi
+        else
+            echo "KWallet not available (non-KDE desktop) — skipping credential storage."
+        fi
     fi
 done
 
@@ -151,7 +157,7 @@ done
 #fi
 # Now start Nextcloud
 echo "Starting Nextcloud Client in Background"
-systemd-run --user --no-block --unit=nextcloud-client.service ${BASECMD} >>${TEMPDIR}/nc_desktop_client.log 2>&1
+systemd-run --user --no-block --unit=nextcloud-client.service --setenv=SESSION_MANAGER= ${BASECMD} >>${TEMPDIR}/nc_desktop_client.log 2>&1
 sleep 2
 echo "Done Setup of Nextcloud."
 exit 0

ks_base_profiles/cinnamon_fullsetup.cfg

@@ -63,6 +63,7 @@ flatpak
 btrfs-assistant
 btrbk
 transmission-gtk
+xapps
 cadaver
 git
 diffuse