feat(ui): close the last gaps against the audit design (31/31)

check_design_parity.py reads its checklist from the audit page's own
proposals; it now reports every one of the 31 as implemented, with no
deliberate divergences left.

  * Schedule: the Kanban/Calendar drop-list became a pair of tabs, and the
    Running lane is outlined while it holds anything — dropping a card there
    starts the task for real, so it should not look like the other six.
  * Cowork: agent / routing / usage / folder moved out of the typing box into
    their own status strip beneath it, styled as status rather than a second
    toolbar. All of them stay interactive; the design's read-only strip would
    have cost features.
  * Folder: the path is written as the screen's title instead of sitting in a
    read-only text box that looked editable and cost a row.
  * GraphRAG: the second toolbar row is gone (Export joined the first), and
    the one button that relabelled itself became Đồ thị | Tin nhắn tabs, so
    the view you are NOT in is named too.
  * Settings gained the theme picker, so language / provider / theme are all
    reachable there as well as on the rail's account row.
  * Task editor: the five group boxes are grouped into three step tabs
    (Nội dung → Lịch chạy → Liên kết). All 22 fields verified present after
    the move; only the old section index is gone, replaced by the tabs.
  * The assistant dot now clears a screen's own bottom bar (Cowork's
    composer), measured from the composer's top edge in window coordinates.

Also adds .gitattributes: without it a Windows checkout records CRLF and
every file reads as fully rewritten to a Linux CI runner.

Verification: 7 check_*.py suites green, no screen clipped at 1920/1366/1280,
and no dialog scrolls sideways at 9/11/14pt.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ui/schedule_task_tab.py

@@ -16,8 +16,8 @@ from PySide6.QtCore import Qt, Signal
 from PySide6.QtWidgets import (
     QAbstractItemView, QComboBox, QDialog, QDialogButtonBox, QHBoxLayout,
     QLabel, QLineEdit, QListWidget, QListWidgetItem, QMenu, QMessageBox,
-    QPlainTextEdit, QPushButton, QScrollArea, QStackedWidget, QTableWidget,
-    QTableWidgetItem, QVBoxLayout, QWidget,
+    QPlainTextEdit, QPushButton, QScrollArea, QStackedWidget, QTabBar,
+    QTableWidget, QTableWidgetItem, QVBoxLayout, QWidget,
 )
 
 from ..core import tasks as taskrepo
@@ -92,13 +92,18 @@ class ScheduleTaskTab(QWidget):
         self.ai_btn = QPushButton()
         self.ai_btn.setIcon(icon("sparkle"))
         self.ai_btn.clicked.connect(self._ai_create)
-        self.view_combo = QComboBox()
-        for v in _VIEWS:
-            self.view_combo.addItem("", v)
-        self.view_combo.currentIndexChanged.connect(self._on_view_changed)
+        # Two views of the same tasks, so they read as a pair of tabs rather
+        # than a drop-list you have to open to discover the Calendar exists.
+        self.view_tabs = QTabBar()
+        self.view_tabs.setObjectName("viewTabs")
+        self.view_tabs.setDrawBase(False)
+        self.view_tabs.setExpanding(False)
+        for _v in _VIEWS:
+            self.view_tabs.addTab("")
+        self.view_tabs.currentChanged.connect(self._on_view_changed)
         header.addWidget(self._title)
         header.addWidget(self.counts_lbl, 1)
-        header.addWidget(self.view_combo)
+        header.addWidget(self.view_tabs)
         header.addWidget(self.add_btn)
         header.addWidget(self.ai_btn)
         root.addLayout(header)
@@ -162,14 +167,14 @@ class ScheduleTaskTab(QWidget):
         self.ai_btn.setText(tr("schedtask.ai_btn"))
         self.ai_btn.setToolTip(tr("schedtask.ai_tooltip"))
         for i, v in enumerate(_VIEWS):
-            self.view_combo.setItemText(i, tr(f"schedtask.view.{v}"))
+            self.view_tabs.setTabText(i, tr(f"schedtask.view.{v}"))
         for status, col in self.columns.items():
             col.setToolTip(tr(f"schedtask.col_tip.{status}"))
         self.refresh()
 
     # ---- Kanban / Calendar view switch --------------------------------
     def _on_view_changed(self) -> None:
-        self._view_stack.setCurrentIndex(self.view_combo.currentIndex())
+        self._view_stack.setCurrentIndex(self.view_tabs.currentIndex())
 
     def _add_task_on_date(self, date_str: str) -> None:
         """Create a task pre-filled with the clicked calendar date (default
@@ -213,9 +218,21 @@ class ScheduleTaskTab(QWidget):
             item = QListWidgetItem(self._card_text(t))
             item.setData(Qt.UserRole, t["task_id"])
             self.columns[status].addItem(item)
+        pal = current_palette()
         for status, col in self.columns.items():
             self.column_headers[status].setText(
                 f"{tr(f'schedtask.status.{status}')} ({counts[status]})")
+            # Dropping a card into Running STARTS the task for real, so that
+            # lane is outlined while it holds anything — the one column here
+            # with a side effect should not look like the other six.
+            if status == "running" and counts[status]:
+                col.setStyleSheet(
+                    f"border: 1px solid {pal.warning}; border-radius: {pal.radius}px;")
+                self.column_headers[status].setStyleSheet(
+                    f"font-weight:600; color: {pal.warning};")
+            else:
+                col.setStyleSheet("")
+                self.column_headers[status].setStyleSheet("font-weight:600;")
             if col.count() == 0:
                 empty = QListWidgetItem(tr("schedtask.no_tasks"))
                 empty.setFlags(Qt.NoItemFlags)