myclaude -r: 固定块 ANSI 重绘修复对齐与滚动冲突 + cli 测试 mock 修复

- picker 弃用 Live 整屏接管，改固定 12 行块增量重绘（\x1b[{n}A 回到块顶逐行覆盖），scrollback 不受影响
- 每行单行渲染，title 列定宽 43 + CJK 感知截断，布局按 80 列设计
- tests: 新增 TestPickerBlock；test_cli which mock 改 side_effect 只命中后端二进制，避免 _npm_global_bin 多跑 subprocess.run；裸 --resume 测试更新为新 picker 语义

tests/test_launcher_sessions.py

@@ -189,6 +189,63 @@ def _make_rows(claude_env, n: int):
     return L._claude_session_rows(claude_env.cwd)
 
 
+def _ansi_strip(text: str) -> str:
+    return re.sub(r"\x1b\[[0-9;]*m", "", text)
+
+
+class TestPickerBlock:
+    """Fixed 80-col block rendering (header + rows + status), CJK-aware."""
+
+    def _rows(self, claude_env, n: int):
+        return _make_rows(claude_env, n)
+
+    def test_rows_are_single_line_within_80(self, claude_env) -> None:
+        rows = self._rows(claude_env, 3)
+        state = L._PickerState(rows=rows)
+        lines = L._picker_block(state, claude_env.cwd, None)
+        # header + 3 rows + status
+        assert len(lines) == 5
+        for line in lines[1:4]:
+            assert len(_ansi_strip(line)) <= 80
+        assert "Sessions in" in lines[0]
+
+    def test_selected_row_reversed(self, claude_env) -> None:
+        rows = self._rows(claude_env, 3)
+        state = L._PickerState(rows=rows, cursor=1)
+        lines = L._picker_block(state, claude_env.cwd, None)
+        assert "\x1b[7m" in lines[2]
+        assert "\x1b[7m" not in lines[1]
+
+    def test_title_truncated_with_ellipsis(self, claude_env) -> None:
+        # _make_rows writes title-less jsonl; inject a long CJK title directly.
+        row = L.ClaudeSessionRow(
+            cli_session_id="long",
+            title="很长的中文标题" * 10,
+            origin="cli",
+            status=None,
+            updated_at=1000.0,
+            jsonl_path=Path("x.jsonl"),
+            xiaohe_session_id=None,
+        )
+        state = L._PickerState(rows=[row])
+        lines = L._picker_block(state, claude_env.cwd, None)
+        plain = _ansi_strip(lines[1])
+        assert "…" in plain
+        assert len(plain) <= 80
+
+    def test_message_line_replaces_hint(self, claude_env) -> None:
+        rows = self._rows(claude_env, 3)
+        state = L._PickerState(rows=rows)
+        lines = L._picker_block(state, claude_env.cwd, "client-only: no jsonl")
+        assert "client-only" in lines[-1]
+        assert "↑↓" not in lines[-1]
+
+    def test_cjk_display_width(self) -> None:
+        assert L._disp_width("ab") == 2
+        assert L._disp_width("中文") == 4
+        assert L._disp_width("a中") == 3
+
+
 class TestPickerAdvance:
     """Windowed picker state machine (no tty needed)."""