Add section toggles, simplify Customize, scope header to Match

- Customize menu: a "Sections" group to show/hide each Match panel
  (You, Match, Opponent, Turn stats, My deck, Preview, Opponent's
  cards); rows collapse when all their panels are hidden. Player panel
  details follow, then Arrange. The submenus duplicating Arrange are gone.
- The top bar's match summary only shows on the Match tab.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/mtga_assistant/ui/main_window.py

@@ -39,7 +39,16 @@ from .toggles import StayOpenMenu, Toggles
 from .turn_view import TURN_DEFAULTS_OFF, TURN_TOGGLES, TurnView
 
 REFRESH_MS = 150
-DECK_TOGGLES = [("preview", "Card preview pane")]
+# Panels of the Match page that can be hidden (rows disappear when all their panels are hidden).
+SECTION_TOGGLES = [
+    ("you", "You"),
+    ("match", "Match"),
+    ("opponent", "Opponent"),
+    ("turns", "Turn stats"),
+    ("my_deck", "My deck"),
+    ("preview", "Preview"),
+    ("opp_deck", "Opponent's cards"),
+]
 VIEWS = ["Match", "History"]
 MATCH, HISTORY = 0, 1
 
@@ -91,7 +100,7 @@ class MainWindow(QMainWindow):
         self._settings = QSettings("mtga-assistant", "mtga-assistant")
 
         self.toggles = [
-            Toggles("deck", DECK_TOGGLES, parent=self),
+            Toggles("sections", SECTION_TOGGLES, parent=self),
             Toggles("match", MATCH_TOGGLES, parent=self),
             Toggles("turn", TURN_TOGGLES, TURN_DEFAULTS_OFF, parent=self),
         ]
@@ -244,14 +253,22 @@ class MainWindow(QMainWindow):
     def _fill_customize(self) -> None:
         menu = self.customize_menu
         menu.clear()
-        self.toggles[1].fill_menu(menu)  # match panels
-        for title, tg in (("Turn stats", self.toggles[2]), ("My deck sections", self.my_sections),
-                          ("Opponent sections", self.opp_sections), ("Preview", self.toggles[0])):
-            sub = StayOpenMenu(title, menu)
-            tg.fill_menu(sub)
-            menu.addMenu(sub)
-        menu.addSeparator()
-        menu.addAction("Arrange sections and stats…").triggered.connect(self._open_arrange)
+        for heading, tg in (("Sections", self.toggles[0]), ("Player panel details", self.toggles[1])):
+            title = menu.addAction(heading)
+            title.setEnabled(False)  # a heading, not an option
+            font = title.font()
+            font.setBold(True)
+            title.setFont(font)
+            tg.fill_menu(menu)
+            menu.addSeparator()
+        # Deck sections and turn stats (order and visibility) live in the Arrange dialog.
+        menu.addAction("Arrange deck sections and turn stats…").triggered.connect(self._open_arrange)
+
+    def _apply_sections(self) -> None:
+        on = self.toggles[0].on
+        self.match_view.show_panels(you=on("you"), match=on("match"), opponent=on("opponent"),
+                                    turns=on("turns"))
+        self.deck_view.show_panels(my_deck=on("my_deck"), preview=on("preview"), opp_deck=on("opp_deck"))
 
     def _open_arrange(self) -> None:
         ArrangeDialog(self._arrangeable(), "Arrange sections and stats", self).exec()
@@ -380,16 +397,20 @@ class MainWindow(QMainWindow):
         if self._rendered.get(index) == key:
             return
         self._rendered[index] = key
-        self._render_header(t)
-        self.deck_view.preview.parentWidget().setVisible(self.toggles[0].on("preview"))
+        self._render_header(t, show_match=index == MATCH)
+        self._apply_sections()
         if index == MATCH:
             self.deck_view.render(t)
             self.match_view.render(t, self.now_ms())
             self.turn_view.render(t)
 
-    def _render_header(self, t: MatchTracker) -> None:
+    def _render_header(self, t: MatchTracker, show_match: bool = True) -> None:
         g = t.game
-        if g is None:
+        if not show_match:
+            # The match summary belongs to the Match tab only.
+            self.header.setText("")
+            self.header.setToolTip("")
+        elif g is None:
             self.header.setText("<span style='color:#8b949c'>Waiting for a match…</span>")
         else:
             parts = [f"<b>vs {t.opponent_name or 'opponent'}</b>"]