Add a Prismana-only filter with a rainbow star icon

tests/aniimo.test.mjs

@@ -54,6 +54,19 @@ test("name searches accept French, English, accents and case", () => {
   assert.deepEqual(filter({ name: "inexistant-xyz" }), []);
 });
 
+test("Prismana-only filtering combines with other criteria before grouping", () => {
+  assert.equal(createAniimoFilters().prismanaOnly, false);
+  const expected = data.variants.filter((variant) => variant.form === "prismana_form");
+  assert.ok(expected.length > 0);
+  assert.deepEqual(filter({ prismanaOnly: true }), expected);
+  const variant = expected[0];
+  const criteria = { name: variant.name, elements: variant.elements, roles: [variant.role], abilities: Object.fromEntries(variant.homeland_abilities.map(({ type, level }) => [type, level])) };
+  assert.deepEqual(filter({ ...criteria, prismanaOnly: true }), [variant]);
+  assert.equal(groupAniimoVariants(expected).length, expected.length);
+  assert.deepEqual(filter({ prismanaOnly: true, name: "emberpup" }), []);
+  assert.equal(filter({ prismanaOnly: false }).length, data.variants.length);
+});
+
 test("Prismana remains the final variation in data and grouped results", () => {
   for (const group of groupAniimoVariants(data.variants)) {
     if (group.some((variant) => variant.form === "prismana_form")) assert.equal(group.at(-1).form, "prismana_form");