feat: restore legacy named playlist workflows

tests/Web/overseas-workflow.test.cjs

@@ -209,6 +209,25 @@ test("stock responses preserve US/TW identity and reject duplicate input-name lo
   })), null);
 });
 
+test("provider symbols accept Unicode letters but keep serialized delimiters closed", () => {
+  const unicode = workflow.normalizeStock({
+    inputName: "Provider Unicode Symbol",
+    symbol: "NAS@해외 종목1",
+    nationCode: "US",
+    fdtc: "1"
+  });
+  assert.ok(unicode);
+  const entry = workflow.createOverseasStockPlaylistEntry(
+    unicode,
+    "stock-candle-5d",
+    { id: "unicode-symbol", fadeDuration: 6, ma5: true, ma20: false });
+  assert.equal(entry.selection.dataCode, "NAS@해외 종목1|US|1");
+
+  for (const symbol of ["NAS|NVDA", "NAS^NVDA", " NAS@NVDA", "NAS@NVDA ", "NAS!NVDA", "NAS\nNVDA", "NAS😀NVDA"]) {
+    assert.equal(workflow.normalizeStock({ ...unicode, symbol }), null, symbol);
+  }
+});
+
 test("bridge errors use exact payloads and reject stale request correlation", () => {
   const industryRequest = workflow.createIndustrySearchRequest("industry-error-1", "AI");
   const industryError = {