M5: Codex design system (dark theme) + kitchen-sink

Programmatic Theme builder + reusable popover and stepper widgets,
ported from CharacterCreator.zip's :root design tokens. Kitchen-sink
scene exercises every primitive for visual eyeballing.

CodexPalette.cs:
  Color tokens lifted verbatim from the React prototype's `:root`
  block (--bg, --ink, --gild, --seal, etc.). Variable names mirror
  the CSS so the audit trail stays readable. Spacing locked at the
  prototype's normal density (--gap=24, --pad=28, --radius=2).

  Scope cut: only the Dark theme ships. The React prototype designed
  Parchment, Dark, and Blood as switchable variations — user direction
  during M5 is that only Dark (leather + candlelight) is wanted for
  this game. Parchment/Blood code dropped, plan doc updated to match
  (§1 goal #5, §4.5 UI map, §5 M5 scope, §10 resolved decisions #4).
  No runtime theme switcher.

CodexTheme.Build():
  Programmatically constructs a Godot Theme from CodexPalette.Dark
  plus CodexSpacing/CodexType tokens. Configures Panel, Card,
  CodexPopover styleboxes; Label variations for H1..H4, CodexTitle,
  Eyebrow, Meta, ValidationOk/Error, CardName/Body/Meta, StepperNum/
  Name; Button + PrimaryButton + GhostButton variants; LineEdit,
  CheckBox, scrollbar styling.

  Fonts: looks for CormorantGaramond / CrimsonPro / JetBrainsMono
  TTFs in res://Fonts/ (or Content/Fonts/) and graceful-falls-back to
  Godot defaults if missing. M5 ships with no fonts in repo; user can
  drop them in later for typography parity with the React prototype.

CodexPopover.cs:
  Hoverable text trigger + floating PanelContainer, mirrors
  src/trait-hint.jsx. Viewport-clamps horizontally and vertically;
  flips above the trigger if there's no room below; 80 ms grace
  period when moving cursor from trigger to popover. Detriment
  variant uses the seal-coloured stylebox. Future TraitName /
  SkillChip / BonusPill widgets layer className differences on top.

CodexStepper.cs:
  Roman-numeral horizontal stepper with Pending / Active / Complete /
  Locked states. Active step gets a 2-px gild underline, Complete
  shows a ✓ in seal-red, Locked shows ✕ + 0.45 modulate. Emits
  StepClicked(int) for non-locked rows. M5 is decorative — M6 wires
  the signal to the character-creation state machine.

KitchenSink.cs + Main.cs --codex-test:
  Verification scene rendering every primitive (header, stepper,
  buttons, inputs, cards, trait popovers). Clicks log to console.
  Fonts default to Godot's Noto Sans until res://Fonts/ is populated.

Closes M5 of theriapolis-rpg-implementation-plan-godot-port.md.
Next: M6 (title + character creation).

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

Theriapolis.Godot/Main.cs

@@ -1,6 +1,7 @@
 using Godot;
 using Theriapolis.GodotHost.Platform;
 using Theriapolis.GodotHost.Rendering;
+using Theriapolis.GodotHost.UI;
 
 namespace Theriapolis.GodotHost;
 
@@ -20,9 +21,15 @@ public partial class Main : Node
         ulong? smokeTestSeed = null;
         ulong? worldMapSeed = null;
         bool runAssetTest = false;
+        bool runCodexTest = false;
         (ulong seed, int tx, int ty)? tacticalArgs = null;
         for (int i = 0; i < args.Length; i++)
         {
+            if (args[i] == "--codex-test")
+            {
+                runCodexTest = true;
+                break;
+            }
             if (args[i] == "--smoke-test")
             {
                 ulong seed = 12345UL;
@@ -94,6 +101,14 @@ public partial class Main : Node
             return;
         }
 
+        if (runCodexTest)
+        {
+            foreach (Node child in GetChildren())
+                child.QueueFree();
+            AddChild(new KitchenSink());
+            return;
+        }
+
         GD.Print("Theriapolis.Godot host ready (M0 hello-world).");
     }