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>

app.py

@@ -314,6 +314,7 @@ class MainWindow(QMainWindow):
     def showEvent(self, event):  # noqa: N802 - Qt override
         super().showEvent(event)
         if getattr(self, "help_agent", None) is not None:
+            self._update_dock_guard()
             self.help_agent.reposition()
             self.help_agent.raise_()
 
@@ -935,6 +936,11 @@ class MainWindow(QMainWindow):
         dlg = SettingsDialog(self.ctx, self)
         if dlg.exec():
             self._apply_theme()
+            # Settings can change the theme too — keep the rail's toggle icon
+            # showing the value that is actually in effect.
+            from .ui.icons import icon as _theme_icon
+            self.theme_btn.setIcon(
+                _theme_icon(self._THEME_ICONS.get(self.ctx.config.theme, "monitor")))
             set_language(self.ctx.config.language)   # apply if changed in Settings
             # reflect provider/theme/language changes
             i = self.provider_combo.findData(self.ctx.config.active_provider)
@@ -965,9 +971,32 @@ class MainWindow(QMainWindow):
         # a programmatic _goto used to leave it on whatever was clicked last.
         if not self._nav_building:
             self._select_nav_row(page, sub)
+        self._update_dock_guard()
         # Switching pages updates which conversation is "current".
         self._refresh_history()
 
+    def _update_dock_guard(self) -> None:
+        """Keep the floating assistant clear of a screen's own bottom bar.
+
+        Only Cowork has one (the composer). Everywhere else the dock sits in
+        the corner as before.
+        """
+        dock = getattr(self, "help_agent", None)
+        if dock is None:
+            return
+        guard = 0
+        on_cowork = (self.pages.currentIndex() == self._ROW_WORKSPACE
+                     and self.workspace.current_subtab() == self.workspace._cowork_tab_idx)
+        if on_cowork:
+            comp = getattr(self.cowork, "composer", None)
+            if comp is not None and not comp.isHidden():
+                # Measured from the composer's TOP edge in window coordinates:
+                # its own height misses the extra row of controls laid out under
+                # it, which left the dot still overlapping by ~25px.
+                top = comp.mapTo(self, comp.rect().topLeft()).y()
+                guard = max(0, self.height() - top + 8)
+        dock.set_bottom_guard(guard)
+
     def _on_projects_changed(self) -> None:
         self.sidebar.refresh()                 # History regroups by project
         self.cowork._apply_output_folder_label()  # project may have been renamed