infra: release_gitea.mjs --skip-build + playwright in devDeps

Two release-pipeline fixes that previously forced manual workarounds.

- scripts/release_gitea.mjs no longer unconditionally runs npm run dist:win.
  New --skip-build flag, plus auto-skip when all 3 required artifacts
  (Setup-<v>.exe, Setup-<v>.exe.blockmap, latest.yml) already exist for
  the requested version. The previous behaviour re-ran the entire test
  suite + electron-builder on every release attempt — unusable when the
  test path was broken.
- playwright ^1.59.1 added to devDependencies. test:e2e / test:e2e:guide
  / test:e2e:full now invoke node scripts/smoke-test*.js directly instead
  of "npm exec --yes --package=playwright -- node ...", which failed with
  MODULE_NOT_FOUND when npm exec could not resolve playwright on the fly.
  No browser binaries needed — the smoke tests drive Electron via
  _electron, not a browser.

All test paths verified after the change: test:e2e, test:e2e:guide,
test:e2e:full, test:merge-split, test:e2e:update-logic — all pass with
the simplified scripts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/release_gitea.mjs

@@ -28,10 +28,13 @@ function parseArgs(argv) {
   if (args.includes("--help") || args.includes("-h")) {
     return { help: true };
   }
+  const FLAGS = new Set(["--dry-run", "--skip-build"]);
   const dryRun = args.includes("--dry-run");
-  const version = args.find((arg) => arg !== "--dry-run") || "";
-  const notes = args.filter((arg) => arg !== "--dry-run").slice(1).join(" ").trim();
-  return { help: false, dryRun, version, notes };
+  const skipBuild = args.includes("--skip-build");
+  const positional = args.filter((arg) => !FLAGS.has(arg));
+  const version = positional[0] || "";
+  const notes = positional.slice(1).join(" ").trim();
+  return { help: false, dryRun, skipBuild, version, notes };
 }
 
 function ensureVersion(version) {
@@ -122,10 +125,22 @@ async function uploadAssets(baseApi, releaseId, authHeader, releaseDir, files) {
   }
 }
 
+function hasAllArtifactsForVersion(version) {
+  const releaseDir = path.join(process.cwd(), "release");
+  const files = [
+    `Twitch-VOD-Manager-Setup-${version}.exe`,
+    `Twitch-VOD-Manager-Setup-${version}.exe.blockmap`,
+    "latest.yml"
+  ];
+  return files.every((f) => fs.existsSync(path.join(releaseDir, f)));
+}
+
 async function main() {
   const args = parseArgs(process.argv);
   if (args.help) {
-    process.stdout.write("Usage: npm run release:gitea -- <version> [release notes] [--dry-run]\n");
+    process.stdout.write("Usage: npm run release:gitea -- <version> [release notes] [--skip-build] [--dry-run]\n");
+    process.stdout.write("       --skip-build   skip dist:win when release/ already has the 3 required artifacts\n");
+    process.stdout.write("                      (auto-skipped when artifacts already exist for this version)\n");
     process.stdout.write("Env: GITEA_BASE_URL, GITEA_REPO_OWNER, GITEA_REPO_NAME, GITEA_TOKEN\n");
     return;
   }
@@ -141,7 +156,20 @@ async function main() {
     run("git", ["push", "origin", tag]);
   }
 
-  run(NPM_EXECUTABLE, ["run", "dist:win"]);
+  // Skip the rebuild when the user passed --skip-build OR when all artifacts
+  // for this version are already on disk. The original unconditional dist:win
+  // re-ran the full test suite + electron-builder even when the .exe already
+  // existed, which made the script unusable when test:e2e was broken.
+  const artifactsExist = hasAllArtifactsForVersion(version);
+  const shouldBuild = !args.skipBuild && !artifactsExist;
+  if (shouldBuild) {
+    run(NPM_EXECUTABLE, ["run", "dist:win"]);
+  } else if (artifactsExist) {
+    process.stdout.write(`Skipping dist:win — artifacts for ${tag} already exist in release/\n`);
+  } else {
+    process.stdout.write(`Skipping dist:win (--skip-build)\n`);
+  }
+
   const assets = ensureAssets(version);
   if (args.dryRun) {
     process.stdout.write(`Dry run complete for ${tag}\n`);