Add hub iframe embed shell with tab fragment API.

Replace full-page soft nav with a persistent shell and /api/embed/page loads so tab switches in the hub iframe avoid document.write flicker.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/build_embed_fragment.py

@@ -0,0 +1,33 @@
+"""Build embed_page_fragment.html from gate index.html."""
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+src_lines = (ROOT / "crypto_monitor_gate" / "templates" / "index.html").read_text(
+    encoding="utf-8"
+).splitlines()
+
+# 1-based line numbers from index.html
+macro_body = src_lines[243:262]  # {% macro %} … {% endmacro %}
+grid_inner = src_lines[328:736]  # inside .grid (exclude outer wrapper)
+stats_block = src_lines[738:772]
+
+out_lines = [
+    "{# Hub iframe tab fragment — shared via embed_templates #}",
+    *macro_body,
+    '<div class="grid">',
+    *grid_inner,
+    "</div>",
+    *stats_block,
+]
+
+out_dir = ROOT / "embed_templates"
+out_dir.mkdir(exist_ok=True)
+text = "\n".join(out_lines) + "\n"
+text = text.replace(
+    "{% include 'order_monitor_rule_tips_gate.html' %}",
+    "{% include order_rule_tips_tpl %}",
+)
+(out_dir / "embed_page_fragment.html").write_text(text, encoding="utf-8")
+print("wrote", out_dir / "embed_page_fragment.html", "lines", len(out_lines))

scripts/extract_instance_page_assets.py

@@ -0,0 +1,49 @@
+"""One-off: extract instance_page.css / instance_page_boot.js from gate index.html."""
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+src = ROOT / "crypto_monitor_gate" / "templates" / "index.html"
+text = src.read_text(encoding="utf-8")
+
+m = re.search(r"<style>(.*?)</style>", text, re.S)
+if m:
+    (ROOT / "static" / "instance_page.css").write_text(m.group(1).strip() + "\n", encoding="utf-8")
+
+marker = '<script src="/static/manual_order_rr_preview.js?v=3"></script>'
+if marker in text:
+    part = text.split(marker, 1)[1]
+    m2 = re.search(r"<script>(.*?)</script>\s*</body>", part, re.S)
+    if m2:
+        boot = m2.group(1).strip()
+        boot = boot.replace(
+            "setInterval(refreshAccountSnapshot, {{ balance_refresh_seconds * 1000 }});",
+            "setInterval(refreshAccountSnapshot, Number(document.body.dataset.balanceRefreshMs || 30000));",
+        )
+        boot = boot.replace(
+            "setInterval(refreshPriceSnapshotConditional, {{ price_refresh_seconds * 1000 }});",
+            "setInterval(refreshPriceSnapshotConditional, Number(document.body.dataset.priceRefreshMs || 5000));",
+        )
+        (ROOT / "static" / "instance_page_boot.js").write_text(boot + "\n", encoding="utf-8")
+
+    part2 = text.split(marker, 1)[1]
+    m3 = re.search(r"<script>(.*?)</script>\s*</body>", part2, re.S)
+    if m3:
+        boot_tpl = m3.group(1).strip()
+        boot_tpl = boot_tpl.replace(
+            "setInterval(refreshAccountSnapshot, {{ balance_refresh_seconds * 1000 }});",
+            "setInterval(refreshAccountSnapshot, Number(document.body.dataset.balanceRefreshMs || 30000));",
+        )
+        boot_tpl = boot_tpl.replace(
+            "setInterval(refreshPriceSnapshotConditional, {{ price_refresh_seconds * 1000 }});",
+            "setInterval(refreshPriceSnapshotConditional, Number(document.body.dataset.priceRefreshMs || 5000));",
+        )
+        embed_dir = ROOT / "embed_templates"
+        embed_dir.mkdir(exist_ok=True)
+        (embed_dir / "embed_boot_scripts.html").write_text(
+            "<script>\n" + boot_tpl + "\n</script>\n", encoding="utf-8"
+        )
+
+print("done")