Allow explicit retry of failed native preview preparation

apps/desktop/tests/media-display.test.mjs

@@ -11,6 +11,18 @@ import {
 import { LatestLane } from "../src/search-state.ts";
 const settle = () => new Promise((resolve) => setImmediate(resolve));
 
+test("explicit preview retry invalidates old work and cannot retry a stale selection", () => {
+  const state = new PreviewRevision();
+  const first = state.select("first");
+  const retried = state.retry(first.revision);
+  assert.equal(typeof retried, "number");
+  assert.equal(state.accepts(first.revision), false);
+  assert.equal(state.accepts(retried), true);
+  assert.equal(state.retry(first.revision), undefined);
+  state.select("second");
+  assert.equal(state.retry(retried), undefined);
+});
+
 test("indexed content refresh invalidates a decoded preview at the same path", () => {
   const revision = new PreviewRevision();
   const source = { kind: "timestamp_ms", number: 1200 };