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/folder_tab.py

@@ -261,14 +261,20 @@ class FolderTab(QWidget):
 
         root = QVBoxLayout(self)
 
+        # The path IS the title of this screen, so it is written as one rather
+        # than shown in a read-only text box that looks editable and costs a
+        # whole row of its own. Full path on hover; the button still opens the
+        # folder picker.
         bar = QHBoxLayout()
-        self.path_edit = QLineEdit(self._root)
-        self.path_edit.setReadOnly(True)
+        self.path_lbl = QLabel(self._root)
+        self.path_lbl.setObjectName("folderTitle")
+        self.path_lbl.setTextInteractionFlags(Qt.TextSelectableByMouse)
+        self.path_lbl.setToolTip(self._root)
         self._open_btn = QPushButton()
         self._open_btn.setIcon(icon("folder"))
         self._open_btn.setObjectName("primary")
         self._open_btn.clicked.connect(self._pick_root)
-        bar.addWidget(self.path_edit, 1)
+        bar.addWidget(self.path_lbl, 1)
         bar.addWidget(self._open_btn)
         root.addLayout(bar)
 
@@ -383,7 +389,8 @@ class FolderTab(QWidget):
         if not p or not os.path.isdir(p):
             return
         self._root = p
-        self.path_edit.setText(p)
+        self.path_lbl.setText(p)
+        self.path_lbl.setToolTip(p)
         self.model.setRootPath(p)
         self.tree.setRootIndex(self.model.index(p))
         if getattr(self, "terminal", None) is not None:
@@ -1492,7 +1499,9 @@ class FolderTab(QWidget):
                               else tr("folder.preview"))
 
     def _retranslate(self) -> None:
-        self.path_edit.setPlaceholderText(tr("folder.path_placeholder"))
+        # The label always shows a real path, so the placeholder became a
+        # tooltip hint on the button that changes it.
+        self._open_btn.setToolTip(tr("folder.path_placeholder"))
         self._open_btn.setText(tr("folder.open_folder"))
         self.save_btn.setText(tr("folder.save"))
         self.ext_btn.setText(tr("folder.open_external"))