Add a living Prism component gallery

tests/quickshell/prism-gallery-contract.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+gallery="$repo_dir/config/dot/quickshell/prism-gallery.qml"
+launcher="$repo_dir/config/dot/quickshell/scripts/panama-prism-gallery"
+
+fail() {
+    printf 'Prism gallery contract: %s\n' "$1" >&2
+    exit 1
+}
+
+[[ -f "$gallery" ]] || fail 'the real-component gallery is missing'
+[[ -x "$launcher" ]] || fail 'the gallery launcher is missing or not executable'
+
+rg -Fq 'import qs.widgets' "$gallery" || fail 'gallery does not use the shared widget module'
+for component in Pill Toggle ValueSlider ThemedIcon PrismEdge; do
+    rg -q "^[[:space:]]*${component}[[:space:]]*\\{" "$gallery" \
+        || fail "gallery does not render the real ${component} component"
+done
+
+rg -Fq 'title: "Panama Prism Gallery"' "$gallery" \
+    || fail 'gallery does not expose a stable compositor window title'
+rg -Fq 'FloatingWindow {' "$gallery" \
+    || fail 'gallery must be a normal tiled application window'
+
+if rg -q '#[0-9a-fA-F]{3,8}' "$gallery"; then
+    fail 'gallery hardcodes a colour instead of using the Theme vocabulary'
+fi
+if rg -q 'loops:[[:space:]]*(Animation\.Infinite|-1)|running:[[:space:]]*true' "$gallery"; then
+    fail 'gallery contains an always-running animation'
+fi
+
+rg -Fq 'qs -p "$gallery" --daemonize' "$launcher" \
+    || fail 'launcher does not start the isolated Quickshell gallery config'
+rg -Fq 'qs -p "$gallery" kill' "$launcher" \
+    || fail 'launcher cannot close an already-open gallery instance'
+
+printf 'Prism gallery contract: PASS\n'