feat(ui,api,telegram): shared conversation panel for obsidian and /admin/panel, bind materializes a window, inbox survives link previews

src/beaver_gateway/frontends/api/frontend.py

@@ -497,14 +497,20 @@ def build_app(runtime: GatewayRuntime, *, memory_root: Path | None = None) -> Fa
         conv = await conv_of(public_id)
         data = await body_of(request)
         frontend = text_of(data, "frontend")
-        external_id = text_of(data, "external_id")
+        external_id = data.get("external_id")
         try:
-            await conversations.bind(
-                conv,
-                frontend=frontend,
-                external_id=external_id,
-                visible=bool(data.get("visible", True)),
-            )
+            if isinstance(external_id, str) and external_id.strip():
+                await conversations.bind(
+                    conv,
+                    frontend=frontend,
+                    external_id=external_id,
+                    visible=bool(data.get("visible", True)),
+                )
+            elif await conversations.frontend(frontend).materialize(conv) is None:
+                raise HTTPException(
+                    status.HTTP_400_BAD_REQUEST,
+                    f"frontend {frontend!r} cannot open a window for {conv.kind!r}",
+                )
         except ValueError as exc:
             raise HTTPException(status.HTTP_400_BAD_REQUEST, str(exc)) from exc
         return await conversations.describe(conv)