M6.7: Parchment theme pass

Lights up the M5 codex design system across the wizard. Default
palette swaps from dark leather to aged-parchment cream with
sealing-wax red selection emphasis, matching the React prototype's
default theme variant. CodexTheme.Build() is applied at the wizard
root so every step + Aside + popover cascades through it.

Theme additions:
- Parchment palette in CodexPalette (Dark retained as alt)
- Type variations registered for Card, CodexPopover, Pill,
  PillDetriment, AbilityToken, AbilitySlot, SkillRow — without
  SetTypeVariation, panel-stylebox lookup falls through to Godot's
  default dark slate, which is what was happening to every bare
  PanelContainer before this pass.
- panel_hover stylebox on Card (gild border) wired via CodexCard's
  MouseEntered/Exited helper; panel_selected bumped to 3px seal-red
  border + soft shadow so selection reads at a glance.

Card selection refactor:
- Replaced the warm-cream Modulate hint on cards with stylebox swaps
  via the new CodexCard.SetSelected helper. The Modulate approach
  was a no-op on cream-on-cream parchment; the stylebox swap looks
  the same on either palette.
- Step intros + Aside section headers now use the existing Eyebrow /
  H2 / H3 / CardName / CardMeta / CardBody label variations.
- Confirm button on Step VIII uses the PrimaryButton variation.

Popover + chip behaviour:
- PopoverLayer is now MouseFilter=Ignore so clicks/scroll/hover all
  pass through. Adjacent chips fire reliably even when the previous
  popover overlaps them spatially.
- Dropped the 80ms grace timer; chip MouseExited closes immediately.
- TraitChip MouseFilter Stop → Pass so clicks bubble up to the
  parent card's GuiInput (selecting the card).

Misc:
- Wizard._Ready inserts a backing Panel so the parchment Bg fills
  the canvas — Wizard root is a plain Control, which paints nothing.
- CodexTheme font lookup tries Cormorant-Medium before -Regular and
  globalizes res://Fonts/ for runtime FontFile load (the previous
  fallback used ContentPaths which points at a sibling data tree).
- StepStats final-score Label rendered at font_size 22 to match the
  AbilityToken die.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Theriapolis.Godot/Scenes/Steps/StepBackground.cs

@@ -33,8 +33,8 @@ public partial class StepBackground : VBoxContainer, IStep
         var intro = new VBoxContainer();
         intro.AddThemeConstantOverride("separation", 6);
         AddChild(intro);
-        intro.AddChild(new Label { Text = "FOLIO V · HISTORY" });
-        intro.AddChild(new Label { Text = "Choose a History" });
+        intro.AddChild(new Label { Text = "FOLIO V · HISTORY", ThemeTypeVariation = "Eyebrow" });
+        intro.AddChild(new Label { Text = "Choose a History",  ThemeTypeVariation = "H2" });
         intro.AddChild(new Label
         {
             Text = "Where your character came from before the wandering began. "
@@ -66,12 +66,9 @@ public partial class StepBackground : VBoxContainer, IStep
     {
         bool selected = _draft.BackgroundId == bg.Id;
 
-        var card = new PanelContainer
-        {
-            CustomMinimumSize = new Vector2(200, 0),
-            MouseFilter = MouseFilterEnum.Stop,
-        };
-        if (selected) card.Modulate = new Color(1f, 0.95f, 0.85f);
+        var card = CodexCard.Make();
+        card.CustomMinimumSize = new Vector2(200, 0);
+        CodexCard.SetSelected(card, selected);
 
         card.GuiInput += (InputEvent e) =>
         {
@@ -83,13 +80,14 @@ public partial class StepBackground : VBoxContainer, IStep
         box.AddThemeConstantOverride("separation", 6);
         card.AddChild(box);
 
-        box.AddChild(new Label { Text = bg.Name });
+        box.AddChild(new Label { Text = bg.Name, ThemeTypeVariation = "CardName" });
         if (!string.IsNullOrEmpty(bg.Flavor))
         {
             box.AddChild(new Label
             {
                 Text = bg.Flavor,
                 AutowrapMode = TextServer.AutowrapMode.WordSmart,
+                ThemeTypeVariation = "CardBody",
             });
         }
 
@@ -113,7 +111,7 @@ public partial class StepBackground : VBoxContainer, IStep
             var featRow = new HBoxContainer();
             featRow.AddThemeConstantOverride("separation", 6);
             box.AddChild(featRow);
-            featRow.AddChild(new Label { Text = "FEATURE" });
+            featRow.AddChild(new Label { Text = "FEATURE", ThemeTypeVariation = "Eyebrow" });
             featRow.AddChild(new TraitChip
             {
                 TraitName = bg.FeatureName,