refactor: move packaging/appimage into desktopApp module

The AppImage build inputs (AppRun, .desktop entry, icon, and the
CI-fetched linuxdeploy binary) are consumed only by desktopApp's
createReleaseAppImage task. Co-locating them under
desktopApp/packaging/appimage/ removes the `../` path escape from the
build script and keeps all desktop packaging assets inside the module.

https://claude.ai/code/session_0137ULcfJkASmfmffFBdW8ac

.github/workflows/create-release.yml

@@ -88,13 +88,13 @@ jobs:
         if: matrix.family == 'linux-portable'
         run: |
           set -euo pipefail
-          curl -fsSL --retry 3 "$LINUXDEPLOY_URL" -o packaging/appimage/linuxdeploy-x86_64.AppImage
-          actual=$(sha256sum packaging/appimage/linuxdeploy-x86_64.AppImage | awk '{print $1}')
+          curl -fsSL --retry 3 "$LINUXDEPLOY_URL" -o desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage
+          actual=$(sha256sum desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage | awk '{print $1}')
           if [[ "$actual" != "$LINUXDEPLOY_SHA256" ]]; then
             echo "::error::linuxdeploy SHA256 mismatch. Expected $LINUXDEPLOY_SHA256, got $actual"
             exit 1
           fi
-          chmod +x packaging/appimage/linuxdeploy-x86_64.AppImage
+          chmod +x desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage
 
       - name: Build desktop artifacts
         uses: nick-fields/retry@ad984534de44a9489a53aefd81eb77f87c70dc60  # v4.0.0

.gitignore

@@ -167,9 +167,9 @@ desktopApp/src/jvmMain/appResources/macos/
 desktopApp/src/jvmMain/appResources/windows/
 
 # CI-fetched AppImage tooling (downloaded by create-release workflow; not committed)
-packaging/appimage/linuxdeploy-x86_64.AppImage
-packaging/appimage/linuxdeploy-extracted/
-packaging/appimage/squashfs-root/
+desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage
+desktopApp/packaging/appimage/linuxdeploy-extracted/
+desktopApp/packaging/appimage/squashfs-root/
 
 # Git worktrees
 .worktrees/

BUILDING.md

@@ -42,9 +42,9 @@ sudo dnf install -y rpm-build
 Install linuxdeploy locally (CI fetches its own — SHA-verified):
 
 ```bash
-curl -fsSL -o packaging/appimage/linuxdeploy-x86_64.AppImage \
+curl -fsSL -o desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage \
   https://github.com/linuxdeploy/linuxdeploy/releases/download/1-alpha-20240109-1/linuxdeploy-x86_64.AppImage
-chmod +x packaging/appimage/linuxdeploy-x86_64.AppImage
+chmod +x desktopApp/packaging/appimage/linuxdeploy-x86_64.AppImage
 ```
 
 ---

desktopApp/build.gradle.kts

@@ -173,13 +173,14 @@ tasks.withType<Download>().configureEach {
 // Instead: wrap `createReleaseDistributable` output with `linuxdeploy` (which
 // auto-bundles libraries, handles rpath, and calls appimagetool internally).
 //
-// Build inputs live in packaging/appimage/:
+// Build inputs live in desktopApp/packaging/appimage/:
 //   - AppRun              shell launcher (sets LD_LIBRARY_PATH including bundled VLC)
 //   - amethyst.desktop    XDG desktop entry
 //   - amethyst.png        512x512 icon
 //
-// linuxdeploy binary is fetched by CI (SHA-verified) into packaging/appimage/
-// as linuxdeploy-x86_64.AppImage. BUILDING.md documents local-dev fetch.
+// linuxdeploy binary is fetched by CI (SHA-verified) into
+// desktopApp/packaging/appimage/ as linuxdeploy-x86_64.AppImage.
+// BUILDING.md documents local-dev fetch.
 val createReleaseAppImage by tasks.registering(Exec::class) {
     group = "compose desktop"
     description = "Bundle createReleaseDistributable output into a Linux AppImage via linuxdeploy."
@@ -188,7 +189,7 @@ val createReleaseAppImage by tasks.registering(Exec::class) {
     val distDir = layout.buildDirectory.dir("compose/binaries/main-release/app/Amethyst")
     val appDir = layout.buildDirectory.dir("appimage/Amethyst.AppDir")
     val outFile = layout.buildDirectory.file("appimage/Amethyst-$appVersion-x86_64.AppImage")
-    val toolRoot = layout.projectDirectory.dir("../packaging/appimage")
+    val toolRoot = layout.projectDirectory.dir("packaging/appimage")
     val linuxdeployTool = toolRoot.file("linuxdeploy-x86_64.AppImage")
 
     inputs.dir(distDir)