Add native Settings and complete live configuration reload

Add compact branded Settings with safe atomic edits, external config refresh and a draggable sidebar. Reconcile services, update connected displays and input devices, apply live layout policy and window rules, and resolve initial floating placement before tiled insertion. Package the Settings launcher and shared Ferese icon.

scripts/install-session.sh

@@ -13,7 +13,7 @@ session_entry=/usr/share/wayland-sessions/ferese.desktop
 [[ ! -e $release_dir ]] || { echo "Release already exists: $release_dir" >&2; exit 1; }
 
 # Refuse to overwrite unrelated installations.
-for name in ferese ferese-shell feresectl ferese-session ferese-lock; do
+for name in ferese ferese-shell ferese-settings feresectl ferese-session ferese-lock; do
     link=/usr/local/bin/$name
     if [[ -e $link || -L $link ]]; then
         [[ -L $link && $(readlink -- "$link") == "$install_root/current/$name" ]] || {
@@ -33,13 +33,14 @@ if [[ -e $session_entry ]]; then
         echo "Different session entry exists: $session_entry" >&2; exit 1;
     }
 fi
-for name in ferese ferese-shell feresectl; do
+for name in ferese ferese-shell ferese-settings feresectl; do
     [[ -x $repo_dir/target/release/$name ]] || { echo "Missing release binary: $name" >&2; exit 1; }
 done
 desktop-file-validate "$repo_dir/packaging/ferese.desktop"
+desktop-file-validate "$repo_dir/packaging/dev.ferese.Settings.desktop"
 
 install -d -m 0755 -- "$release_dir" /usr/local/bin /usr/share/wayland-sessions
-for name in ferese ferese-shell feresectl; do
+for name in ferese ferese-shell ferese-settings feresectl; do
     install -m 0755 -- "$repo_dir/target/release/$name" "$release_dir/$name"
 done
 install -m 0755 -- "$repo_dir/packaging/ferese-session" "$release_dir/ferese-session"
@@ -51,8 +52,12 @@ if [[ -L $install_root/current ]]; then
 fi
 ln -s -- "releases/$release_id" "$install_root/current-$release_id"
 mv -Tf -- "$install_root/current-$release_id" "$install_root/current"
-for name in ferese ferese-shell feresectl ferese-session ferese-lock; do
+for name in ferese ferese-shell ferese-settings feresectl ferese-session ferese-lock; do
     ln -sfn -- "$install_root/current/$name" "/usr/local/bin/$name"
 done
 install -m 0644 -- "$repo_dir/packaging/ferese.desktop" "$session_entry"
+install -D -m 0644 -- "$repo_dir/packaging/dev.ferese.Settings.desktop" /usr/local/share/applications/dev.ferese.Settings.desktop
+install -D -m 0644 -- "$repo_dir/packaging/icons/ferese.svg" /usr/local/share/icons/hicolor/scalable/apps/dev.ferese.Settings.svg
+install -D -m 0644 -- "$repo_dir/packaging/icons/ferese.svg" /usr/local/share/icons/hicolor/scalable/apps/ferese.svg
+if command -v update-desktop-database >/dev/null; then update-desktop-database /usr/local/share/applications || true; fi
 echo "Installed Ferese $release_id. Select Ferese in SDDM."