feat(kde-neon-6): add core24 support

Allows core24 snaps to use the kde-neon and kde-neon-6 extensions.

extensions/desktop/command-chain-kde/Makefile

@@ -0,0 +1,13 @@
+#!/usr/bin/make -f
+
+BIN_DIR := $(DESTDIR)/snap/command-chain
+GPU_WRAPPER :=
+
+scripts = hooks-configure-desktop desktop-launch run $(GPU_WRAPPER)
+
+*:
+	install -D -m755 "$@" "$(BIN_DIR)"/"$@"
+
+install: $(scripts)
+
+.PHONY: $(scripts)

extensions/desktop/command-chain-kde/desktop-launch

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+if [ "$QT_VERSION" == "6" ]; then
+
+set -- "${SNAP}/kf6/snap/command-chain/desktop-launch6" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"
+
+elif [ "$QT_VERSION" == "5" ]; then
+
+set -- "${SNAP}/kf5/snap/command-chain/desktop-launch" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"
+
+fi

extensions/desktop/command-chain-kde/gpu-2404-wrapper

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/gpu-2404/bin/gpu-2404-provider-wrapper" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/hooks-configure-desktop

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/kf6/command-chain/hooks-configure-desktop" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/hooks-configure-fonts

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -- "${SNAP}/kf6/command-chain/hooks-configure-fonts" "$@"
+# shellcheck source=/dev/null
+source "${SNAP}/snap/command-chain/run"

extensions/desktop/command-chain-kde/run

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+if [ -z "$1" ]; then
+  echo "Usage: run <command>"
+  exit 1
+fi
+
+if [ -z "${SNAP}" ]; then
+  echo "Not running inside a snap context: SNAP not declared"
+  exit
+fi
+
+
+if [ ! -f "$1" ]; then
+  echo "Content snap command-chain for $1 not found: ensure slot is connected"
+  exit
+fi
+
+# emulate "exec $@" using "source"
+# have to disable "unused variables" because checkshell doesn't know that $BASH_ARGV0 is $0
+# shellcheck disable=SC2034  # Unused variables left for readability
+BASH_ARGV0=$1
+shift
+# shellcheck source=/dev/null
+source "$0"