Import existing LinTunes project

Snapshot of the existing codebase before working through the TASKS.md
backlog. Real library data (data/) and the iTunes import fixture
(itunes-test-library/) are gitignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packaging/install-desktop.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Install the lintunes .desktop entry and icon for the current user, so GNOME
+# shows a proper icon and the app can be pinned to the dash.
+# Re-run after swapping packaging/lintunes.png to update the icon.
+set -euo pipefail
+
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+APPS_DIR="$HOME/.local/share/applications"
+ICON_DIR="$HOME/.local/share/icons/hicolor/256x256/apps"
+
+mkdir -p "$APPS_DIR" "$ICON_DIR"
+cp "$HERE/lintunes.png" "$ICON_DIR/lintunes.png"
+
+# If lintunes isn't on PATH, point Exec at this checkout's module instead.
+# We must NOT rely on the working directory: GNOME's dash launches apps via a
+# systemd scope that does not reliably honor the Path= key, so `python3 -m`
+# would fail with "No module named 'lintunes'". Put the checkout on PYTHONPATH
+# and use absolute python so the launch is independent of CWD and PATH.
+PROJECT_DIR="$(dirname "$HERE")"
+PY="$(command -v python3 || echo /usr/bin/python3)"
+if command -v lintunes >/dev/null 2>&1; then
+    cp "$HERE/lintunes.desktop" "$APPS_DIR/lintunes.desktop"
+else
+    sed -e "s|^Exec=lintunes|Exec=/usr/bin/env PYTHONPATH=$PROJECT_DIR $PY -m lintunes.main|" \
+        -e "s|^Terminal=|Path=$PROJECT_DIR\nTerminal=|" \
+        "$HERE/lintunes.desktop" > "$APPS_DIR/lintunes.desktop"
+fi
+
+command -v update-desktop-database >/dev/null 2>&1 && \
+    update-desktop-database "$APPS_DIR" || true
+command -v gtk-update-icon-cache >/dev/null 2>&1 && \
+    gtk-update-icon-cache -t "$HOME/.local/share/icons/hicolor" 2>/dev/null || true
+
+echo "Installed. Find 'LinTunes' in the app grid; right-click to pin to dash."