feat: add thread list and deletion API with new component

- switch docs, stories, and UI to the slot-based CopilotThreadList API
- surface delete controls with optimistic updates and error feedback
- extend useThreads with deleteThread/currentThreadId helpers plus tests
- prevent suggestion-generated runs from polluting thread history
- wire DELETE handler through runtime endpoints and runner backends
- harden CopilotChat reconnect flow and tool-call rendering keys

Signed-off-by: Tyler Slaton <[email protected]>

Author: tylerslaton

apps/docs/docs.json

@@ -40,6 +40,10 @@
         "group": "Get Started",
         "pages": ["introduction"]
       },
+      {
+        "group": "Guides",
+        "pages": ["guides/resource-scoping", "guides/thread-management"]
+      },
       {
         "group": "API Reference",
         "pages": [
@@ -56,12 +60,13 @@
               },
               {
                 "group": "Components",
-                "pages": ["reference/copilot-chat"]
+                "pages": ["reference/copilot-chat", "reference/copilot-thread-list"]
               },
               {
                 "group": "Hooks",
                 "pages": [
                   "reference/use-copilotkit",
+                  "reference/use-threads",
                   "reference/use-agent",
                   "reference/use-agent-context",
                   "reference/use-frontend-tool",