fix(build): harden engine downloads and refresh dependencies

- update Lucide, Vitest, compatible Cargo locks, and FFmpeg source pins

- resume interrupted archives with HTTP range and checksum validation

- cover complete, range-ignored, and unsatisfiable archive recovery paths

scripts/engine-download.js

@@ -0,0 +1,185 @@
+import fs from 'node:fs';
+import { Readable, Transform } from 'node:stream';
+import { pipeline } from 'node:stream/promises';
+
+import { sha256 } from './engine-payload-integrity.js';
+
+const DEFAULT_ATTEMPTS = 3;
+const DEFAULT_IDLE_TIMEOUT_MS = 120_000;
+const DEFAULT_RETRY_DELAYS_MS = [2_000, 5_000];
+const FILE_RESET_RETRY_DELAYS_MS = [100, 250, 500, 1_000, 2_000];
+
+function parseContentRange(value) {
+  const match = /^bytes (\d+)-(\d+)\/(\d+|\*)$/.exec(value || '');
+  if (!match) return undefined;
+  const start = Number(match[1]);
+  const end = Number(match[2]);
+  const total = match[3] === '*' ? undefined : Number(match[3]);
+  if (!Number.isSafeInteger(start) || !Number.isSafeInteger(end) || end < start) {
+    return undefined;
+  }
+  if (total !== undefined && (!Number.isSafeInteger(total) || end >= total)) {
+    return undefined;
+  }
+  return { start, end, total };
+}
+
+function responseLength(response) {
+  const value = response.headers.get('content-length');
+  if (!value || !/^\d+$/.test(value)) return undefined;
+  const length = Number(value);
+  return Number.isSafeInteger(length) ? length : undefined;
+}
+
+function createDownloadTimeout(idleTimeoutMs) {
+  const controller = new AbortController();
+  let timer;
+  const refresh = () => {
+    clearTimeout(timer);
+    timer = setTimeout(() => {
+      controller.abort(new Error(`Download idle for ${idleTimeoutMs}ms`));
+    }, idleTimeoutMs);
+  };
+  const dispose = () => clearTimeout(timer);
+  refresh();
+  return { signal: controller.signal, refresh, dispose };
+}
+
+function archiveSize(archive) {
+  try {
+    return fs.statSync(archive).size;
+  } catch (error) {
+    if (error?.code === 'ENOENT') return 0;
+    throw error;
+  }
+}
+
+function checksumMismatchError(name, expected, actual) {
+  const error = new Error(`Archive checksum mismatch for ${name}. Expected ${expected}, got ${actual}`);
+  error.code = 'ARCHIVE_CHECKSUM_MISMATCH';
+  return error;
+}
+
+function sleep(milliseconds) {
+  return new Promise(resolve => setTimeout(resolve, milliseconds));
+}
+
+async function resetArchive(archive) {
+  for (let attempt = 0; ; attempt += 1) {
+    try {
+      fs.rmSync(archive, { force: true });
+      return;
+    } catch (error) {
+      const retryable = process.platform === 'win32'
+        && ['EACCES', 'EBUSY', 'EPERM'].includes(error?.code);
+      if (!retryable || attempt >= FILE_RESET_RETRY_DELAYS_MS.length) throw error;
+      await sleep(FILE_RESET_RETRY_DELAYS_MS[attempt]);
+    }
+  }
+}
+
+/**
+ * Download and checksum an engine archive, resuming an interrupted response
+ * when the provider honors HTTP range requests. A provider that ignores the
+ * range is handled safely by replacing the partial file instead of appending
+ * a second full archive to it.
+ */
+export async function downloadEngineArchive({
+  name,
+  url,
+  archive,
+  expectedSha256,
+  attempts = DEFAULT_ATTEMPTS,
+  idleTimeoutMs = DEFAULT_IDLE_TIMEOUT_MS,
+  retryDelaysMs = DEFAULT_RETRY_DELAYS_MS,
+}) {
+  let lastError;
+
+  for (let attempt = 1; attempt <= attempts; attempt += 1) {
+    const partialSize = archiveSize(archive);
+    if (partialSize > 0 && sha256(archive) === expectedSha256) return archive;
+    const downloadTimeout = createDownloadTimeout(idleTimeoutMs);
+    let resetForRetry = false;
+
+    try {
+      const response = await fetch(url, {
+        headers: partialSize > 0 ? { Range: `bytes=${partialSize}-` } : undefined,
+        redirect: 'follow',
+        signal: downloadTimeout.signal,
+      });
+
+      if (response.status === 416 && partialSize > 0) {
+        await response.body?.cancel();
+        resetForRetry = true;
+        throw new Error(`Retained partial archive range is not satisfiable for ${name}`);
+      }
+
+      if (!response.ok || !response.body) {
+        await response.body?.cancel();
+        throw new Error(`Failed to download ${name}: HTTP ${response.status}`);
+      }
+
+      const contentRange = response.status === 206
+        ? parseContentRange(response.headers.get('content-range'))
+        : undefined;
+      if (response.status === 206 && (!contentRange || contentRange.start !== partialSize)) {
+        await response.body.cancel();
+        throw new Error(`Invalid Content-Range while downloading ${name}`);
+      }
+
+      const append = response.status === 206 && partialSize > 0;
+      const expectedResponseLength = responseLength(response);
+      if (!append && partialSize > 0) {
+        // The provider ignored Range and returned the complete archive.
+        await resetArchive(archive);
+      }
+
+      await pipeline(
+        Readable.fromWeb(response.body),
+        new Transform({
+          transform(chunk, encoding, callback) {
+            downloadTimeout.refresh();
+            callback(null, chunk, encoding);
+          },
+        }),
+        fs.createWriteStream(archive, { flags: append ? 'a' : 'w' }),
+        { signal: downloadTimeout.signal },
+      );
+
+      const finalSize = archiveSize(archive);
+      const expectedFinalSize = contentRange?.total
+        ?? (expectedResponseLength === undefined
+          ? undefined
+          : (append ? partialSize + expectedResponseLength : expectedResponseLength));
+      if (expectedFinalSize !== undefined && finalSize !== expectedFinalSize) {
+        throw new Error(
+          `Incomplete archive for ${name}: expected ${expectedFinalSize} bytes, got ${finalSize}`,
+        );
+      }
+
+      const actual = sha256(archive);
+      if (actual === expectedSha256) return archive;
+
+      resetForRetry = true;
+      throw checksumMismatchError(name, expectedSha256, actual);
+    } catch (error) {
+      lastError = error;
+      if (resetForRetry || error?.code === 'ARCHIVE_CHECKSUM_MISMATCH') {
+        await resetArchive(archive);
+      }
+      if (attempt === attempts) {
+        throw new Error(
+          `Failed to download ${name} after ${attempts} attempts: ${
+            error instanceof Error ? error.message : String(error)
+          }`,
+          { cause: error },
+        );
+      }
+      await new Promise(resolve => setTimeout(resolve, retryDelaysMs[attempt - 1] ?? 0));
+    } finally {
+      downloadTimeout.dispose();
+    }
+  }
+
+  throw lastError;
+}