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.

tests/test_tool_call_persistence.py

@@ -0,0 +1,71 @@
+"""Tests for backend tool-call summary extraction used by WebUI session persistence."""
+import pathlib
+import sys
+
+REPO_ROOT = pathlib.Path(__file__).parent.parent.resolve()
+sys.path.insert(0, str(REPO_ROOT))
+
+from api.streaming import _extract_tool_calls_from_messages
+
+
+def test_extract_tool_calls_from_openai_message_linkage():
+    messages = [
+        {"role": "user", "content": "ls"},
+        {
+            "role": "assistant",
+            "content": "",
+            "tool_calls": [{
+                "id": "call-1",
+                "function": {"name": "terminal", "arguments": '{"command":"ls"}'},
+            }],
+        },
+        {
+            "role": "tool",
+            "tool_call_id": "call-1",
+            "content": '{"output":"file.txt","exit_code":0}',
+        },
+    ]
+    result = _extract_tool_calls_from_messages(messages)
+    assert len(result) == 1
+    assert result[0]["name"] == "terminal"
+    assert result[0]["assistant_msg_idx"] == 1
+    assert result[0]["snippet"] == "file.txt"
+
+
+def test_extract_tool_calls_falls_back_to_live_progress_when_ids_missing():
+    messages = [
+        {"role": "user", "content": "write spec"},
+        {"role": "assistant", "content": "Starting."},
+        {"role": "tool", "content": '{"bytes_written":4955}'},
+        {"role": "assistant", "content": ""},
+    ]
+    live_tool_calls = [{"name": "write_file", "args": {"path": "/tmp/SPEC.md"}}]
+    result = _extract_tool_calls_from_messages(messages, live_tool_calls=live_tool_calls)
+    assert len(result) == 1
+    assert result[0]["name"] == "write_file"
+    assert result[0]["assistant_msg_idx"] == 1
+    assert "bytes_written" in result[0]["snippet"]
+    assert result[0]["args"]["path"] == "/tmp/SPEC.md"
+
+
+def test_extract_tool_calls_preserves_mixed_linked_and_fallback_results():
+    messages = [
+        {
+            "role": "assistant",
+            "content": "",
+            "tool_calls": [{"id": "call-1", "function": {"name": "terminal", "arguments": '{"command":"pwd"}'}}],
+        },
+        {"role": "tool", "tool_call_id": "call-1", "content": '{"output":"/tmp"}'},
+        {"role": "assistant", "content": "Next"},
+        {"role": "tool", "content": '{"result":"saved"}'},
+    ]
+    live_tool_calls = [
+        {"name": "terminal", "args": {"command": "pwd"}},
+        {"name": "write_file", "args": {"path": "/tmp/out.txt"}},
+    ]
+    result = _extract_tool_calls_from_messages(messages, live_tool_calls=live_tool_calls)
+    assert len(result) == 2
+    assert result[0]["name"] == "terminal"
+    assert result[1]["name"] == "write_file"
+    assert result[1]["assistant_msg_idx"] == 2
+    assert result[1]["snippet"] == "saved"