feat: redesign chat transcript + fix streaming/persistence lifecycle — v0.50.70 (PR #587 by @aronprins)

Redesign chat transcript + fix streaming/persistence lifecycle — v0.50.70

Squash-merges PR #587 by @aronprins (Aron Prins). Full credit to @aronprins for all feature and fix work.

Transcript redesign: unified --msg-rail/--msg-max CSS variables, user turns as tinted cards, thinking cards as bordered panels, error card treatment, day-change separators, composer fade.

Approval/clarify as composer flyouts: cards slide up from behind composer top, overflow:hidden + translateY clip prevents travel visibility, focus({preventScroll:true}).

Streaming lifecycle: DOM order user→thinking→tool cards→response, no mid-stream jump. Live tool cards inserted before [data-live-assistant].

Persistence: reasoning attached before s.save(), _restore_reasoning_metadata on reload, role=tool rows preserved in S.messages, CLI-session tool-result fallback.

Workspace panel FOUC fix: [data-workspace-panel] set at parse time.

Docs: docs/ui-ux/index.html + two-stage-proposal.html.

Maintainer additions (433b867): CHANGELOG v0.50.70, version badge, usage badge loop simplification.

Reviewed and approved by @nesquena (independent review). 1361 tests passing.

api/routes.py

@@ -2085,7 +2085,9 @@ def _handle_chat_sync(handler, body):
                 "write_file, read_file, search_files, terminal workdir, and patch. "
                 "Never fall back to a hardcoded path when this tag is present."
             )
-            from api.streaming import _sanitize_messages_for_api
+            from api.streaming import _sanitize_messages_for_api, _restore_reasoning_metadata
+
+            _previous_messages = list(s.messages or [])
 
             result = agent.run_conversation(
                 user_message=workspace_ctx + msg,
@@ -2108,7 +2110,10 @@ def _handle_chat_sync(handler, body):
                 os.environ.pop("HERMES_SESSION_KEY", None)
             else:
                 os.environ["HERMES_SESSION_KEY"] = old_session_key
-    s.messages = result.get("messages") or s.messages
+    s.messages = _restore_reasoning_metadata(
+        _previous_messages,
+        result.get("messages") or s.messages,
+    )
     # Only auto-generate title when still default; preserves user renames
     if s.title == "Untitled":
         s.title = title_from(s.messages, s.title)