Fix relationship matrix readability: parchment panel bg + un-fade diagonal

The #relmap-panel had a dark-text rule but no background, so its <th> header cells
sat on the dark Space theme (dark-on-dark, washed out) while body cells were fine
(they set their own light backgrounds). Give the panel a parchment background like
the other panels so headers read dark-on-light. Also drop the opacity:.5 on the
self-diagonal cells (it faded the text); use a muted background with full-opacity
dark text instead.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app.py

@@ -202,6 +202,7 @@ CSS = """
    id-scoped !important dark-text rule as the other cream panels. The heat-panel
    and cutscene-panel are DARK surfaces with light inline text (safe by
    construction); they intentionally get no dark !important rule. */
+#relmap-panel {background:#fbf7ec !important; border:1px solid #dcd6c4; border-radius:12px; padding:10px 14px;}
 #relmap-panel, #relmap-panel * {color:#2e2519 !important;}
 """
 

ttw/game.py

@@ -285,8 +285,9 @@ class Game:
             for col in columns:
                 value = int(row[col])
                 if col == name:
-                    bg = "#dcd6c4"
-                    opacity = "opacity:.5;"
+                    # Self-cell: muted background but full-opacity dark text so it
+                    # stays readable (opacity dimming faded the text on dark themes).
+                    bg, opacity = "#e9e3d4", ""
                 elif value > 0:
                     bg, opacity = "#cfe8d2", ""
                 elif value < 0: