Merge views into Match, expand history, and polish the UI

- Match page now holds players/match info, turn stats with a turn
  picker, and the deck lists (My deck · Preview · Opponent); the Deck
  and Turn tabs are gone. Section heights are draggable and remembered.
- History: sortable, resizable columns; deck and commander columns;
  right-click to show only or hide games with a value, with filter
  chips; stats tiles (win rate overall, last 10/100, last 7 days,
  play/draw, average length and turns) that follow the filters.
  Commanders are backfilled for games recorded before they were stored.
- Deck panel shows copies per zone against the deck total (e.g. 2/5).
- Preview can be cleared with ✕, a click on the image, or Esc.
- Customize menu stays open while toggling; Arrange covers deck
  sections and turn stats together.
- Fix squeezed nav buttons and the header pushing controls off-screen.
- Fix known opponent cards being double-counted when also revealed.

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

tests/test_history_stats.py

@@ -0,0 +1,58 @@
+from mtga_assistant.history import GameSummary
+from mtga_assistant.history_stats import WEEK_MS, Filter, apply_filters, compute_stats
+
+NOW = 1_800_000_000_000
+DAY = 24 * 3600 * 1000
+
+
+def game(n: int, result: str, *, deck="Deck A", on_play="me", days_ago=0, turns=8, length_s=300,
+         event="Ladder", best_of=1, game_number=1) -> GameSummary:
+    start = NOW - days_ago * DAY - n * 1000
+    return GameSummary(match_id=f"m{n}", game_number=game_number, started_ms=start, ended_ms=start + length_s * 1000,
+                       event_id=event, opponent=f"opp{n}", deck_name=deck, on_play=on_play, result=result,
+                       my_colors="UB", opp_colors="R", turns=turns, best_of=best_of)
+
+
+def test_filters_only_and_hide_combine():
+    games = [game(1, "Won", deck="A"), game(2, "Lost", deck="B"), game(3, "Won", deck="A", on_play="opp")]
+    assert [g.match_id for g in apply_filters(games, [Filter("deck", "A")])] == ["m1", "m3"]
+    assert [g.match_id for g in apply_filters(games, [Filter("deck", "A"), Filter("on_play", "opp")])] == ["m3"]
+    assert [g.match_id for g in apply_filters(games, [Filter("deck", "A", exclude=True)])] == ["m2"]
+
+
+def test_filter_labels_are_readable():
+    assert Filter("on_play", "opp").label == "On the play = you on the draw"
+    assert Filter("event", "Play_Brawl_Historic", exclude=True).label == "Event ≠ Play Brawl Historic"
+    assert Filter("game", "Bo1").label == "Game = Bo1"
+
+
+def test_stats_windows_and_averages():
+    # 12 recent games (newest first: n=0 is newest): W W L W W L W W L W | L L
+    results = ["Won", "Won", "Lost", "Won", "Won", "Lost", "Won", "Won", "Lost", "Won", "Lost", "Lost"]
+    games = [game(n, r, days_ago=0 if n < 6 else 10, turns=6 + n % 3, length_s=240 + 60 * (n % 2),
+                  on_play="me" if n % 2 == 0 else "opp")
+             for n, r in enumerate(results)]
+    games.append(game(99, "", days_ago=1))  # no result: counted as a game, not in win rates
+    s = compute_stats(games, NOW)
+    assert s.games == 13
+    assert (s.overall.wins, s.overall.losses) == (7, 5)
+    assert (s.last_10.wins, s.last_10.losses) == (7, 3)
+    assert s.last_10.rate == 0.7
+    assert s.last_100.games == 12
+    assert s.week_games == 7 and (s.week.wins, s.week.losses) == (4, 2)
+    assert (s.on_play.wins, s.on_play.losses) == (3, 3)
+    assert (s.on_draw.wins, s.on_draw.losses) == (4, 2)
+    assert s.avg_turns is not None and 6 <= s.avg_turns <= 8
+    assert s.avg_length_s is not None and 240 <= s.avg_length_s <= 300
+
+
+def test_stats_follow_filters():
+    games = [game(1, "Won", deck="A"), game(2, "Lost", deck="A"), game(3, "Lost", deck="B"), game(4, "Lost", deck="B")]
+    assert compute_stats(apply_filters(games, [Filter("deck", "A")]), NOW).overall.rate == 0.5
+    assert compute_stats(apply_filters(games, [Filter("deck", "B")]), NOW).overall.rate == 0.0
+
+
+def test_empty_history():
+    s = compute_stats([], NOW)
+    assert s.games == 0 and s.overall.rate is None and s.avg_length_s is None and s.week_games == 0
+    assert WEEK_MS == 7 * DAY