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/Wizard.cs

@@ -8,10 +8,8 @@ namespace Theriapolis.GodotHost.Scenes;
 /// nav bar. Owns the <see cref="CharacterDraft"/> resource and dispatches
 /// each step's content into the StepHost.
 ///
-/// Default theme only at this layer — per guide §12 (build order),
-/// the parchment Theme lands as a final pass once structural correctness
-/// is verified. Until then, font/colour issues are clearly font/colour
-/// issues, not layout issues.
+/// The codex Theme is applied at this root in <see cref="_Ready"/> and
+/// cascades through every descendant — steps, Aside, popover layer.
 /// </summary>
 public partial class Wizard : Control
 {
@@ -56,6 +54,22 @@ public partial class Wizard : Control
 
     public override void _Ready()
     {
+        Theme = UI.CodexTheme.Build();
+
+        // The wizard root is a Control, which paints nothing — without a
+        // backing Panel the viewport's default grey clear color shows
+        // through. Insert a Panel sized to the full rect so the theme's
+        // parchment Bg fills the canvas, then move it behind the existing
+        // children so it doesn't intercept mouse events.
+        var bg = new Panel
+        {
+            AnchorRight = 1,
+            AnchorBottom = 1,
+            MouseFilter = MouseFilterEnum.Ignore,
+        };
+        AddChild(bg);
+        MoveChild(bg, 0);
+
         Character = new UI.CharacterDraft();
 
         _stepper     = GetNode<UI.Widgets.CodexStepper>("%Stepper");