feat(ui,api): chat view with live tail and autoscroll, conversation rail with last message previews

src/beaver_gateway/frontends/api/frontend.py

@@ -46,7 +46,13 @@ from beaver_gateway.storage import (
     list_tokens,
     revoke_token,
 )
-from beaver_gateway.storage.models import Conversation, RateLimit, Token, Usage
+from beaver_gateway.storage.models import (
+    Conversation,
+    InjectQueueItem,
+    RateLimit,
+    Token,
+    Usage,
+)
 
 if TYPE_CHECKING:
     from collections.abc import AsyncIterator, Iterable, Sequence
@@ -220,7 +226,16 @@ def build_app(runtime: GatewayRuntime, *, memory_root: Path | None = None) -> Fa
             kind=q.get("kind"),
             limit=query_int(request, "limit", 200),
         )
-        return {"conversations": [conversations.public(r) for r in rows]}
+        latest = await conversations.queue.latest(cast("int", r.id) for r in rows)
+        return {
+            "conversations": [
+                {
+                    **conversations.public(r),
+                    "last_item": _queue_item(latest.get(cast("int", r.id))),
+                }
+                for r in rows
+            ]
+        }
 
     @app.post("/api/conversations", status_code=status.HTTP_201_CREATED)
     async def create_conversation(request: Request) -> dict[str, Any]:
@@ -272,14 +287,7 @@ def build_app(runtime: GatewayRuntime, *, memory_root: Path | None = None) -> Fa
         conv = await conv_of(public_id)
         out = await conversations.describe(conv)
         out["queue"] = [
-            {
-                "id": i.id,
-                "priority": i.priority,
-                "origin": i.origin,
-                "status": i.status,
-                "created_at": _iso(i.created_at),
-                "text": i.text[:200],
-            }
+            _queue_item(i)
             for i in await conversations.queue.recent(cast("int", conv.id), limit=20)
         ]
         return out
@@ -859,6 +867,19 @@ async def _conversation_titles(
     }
 
 
+def _queue_item(item: InjectQueueItem | None) -> dict[str, Any] | None:
+    if item is None:
+        return None
+    return {
+        "id": item.id,
+        "priority": item.priority,
+        "origin": item.origin,
+        "status": item.status,
+        "created_at": _iso(item.created_at),
+        "text": item.text[:200],
+    }
+
+
 def _limit_public(row: RateLimit) -> dict[str, Any]:
     return {
         "id": row.id,