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-rpg-implementation-plan-godot-port.md

@@ -55,10 +55,10 @@ architecture test gets a one-line update (the forbidden namespace becomes
    dungeon, plus the Phase-7 dialogue→combat overlay. *Visual* parity with
    today's CodexUI is **not** a goal — the React prototype is the new
    baseline. Behavioural parity (what each screen *does*) is the goal.
-5. **Ship all three themes.** Parchment (default), dark (leather &
-   candlelight), blood (warm crimson). The React prototype already designed
-   them; Godot's Theme + ThemeVariation system makes shipping all three
-   approximately free. Theme is a runtime player setting, not a dev tweak.
+5. **Ship the dark theme only.** The React prototype designed Parchment,
+   Dark, and Blood; the user's call during M5 is that only Dark (leather +
+   candlelight) is wanted for this game. Parchment and Blood are dropped
+   from scope. No runtime theme switcher — there is one theme.
 6. **Tests still green.** All ~700 Core/worldgen/determinism/save tests pass
    unchanged. Project builds and runs `dotnet test` and the headless
    `Theriapolis.Tools` CLI exactly as before.
@@ -270,8 +270,7 @@ only; do not preserve its visual choices.
 
 | React prototype (CharacterCreator.zip)              | Godot equivalent                                       |
 |-----------------------------------------------------|--------------------------------------------------------|
-| CSS custom properties (`--bg`, `--ink`, `--gild`, ...)  | `Theme` resource type variations (one per theme)   |
-| `[data-theme="dark"]` / `[data-theme="blood"]`      | `ThemeVariation` resources, switched via player setting|
+| CSS custom properties (`--bg`, `--ink`, `--gild`, ...)  | Single `Theme` resource constructed in `CodexTheme.cs`|
 | `.codex-header`, `.codex-title`, `.codex-sub`       | `PanelContainer` + `Label` with display font theme     |
 | `.stepper` / `.step` / `.step.active/.complete/.locked` | Custom `HBoxContainer` script with state-driven theme |
 | `.page` (two-column main + aside)                   | `HSplitContainer` or `HBoxContainer` (fixed ratio)     |
@@ -384,8 +383,8 @@ foundation every subsequent screen builds on.
   `--bg` / `--ink` / `--gild` / `--seal` / `--rule` mapped to Theme constants;
   display + body fonts as Theme default fonts; standard spacing/radius
   constants.
-- `Theme/Variations/dark.tres` and `Theme/Variations/blood.tres`: ThemeVariations
-  for the other two themes. Player setting selects the active variation.
+- ~~Theme variations for Parchment + Blood~~ — dropped during M5 per
+  user decision; Dark only.
 - Fonts: copy Cormorant Garamond, Crimson Pro, Spectral, EB Garamond, Cinzel,
   Uncial Antiqua, JetBrains Mono into `res://Fonts/`. Bundle as `FontFile`
   resources at the sizes the prototype uses (verify by spot-rendering each).
@@ -712,8 +711,8 @@ The bright line: **anything that touches `WorldState`, `PlayerCharacter`,
    default. The Theme must scale legibly across 1920×1080 / 2560×1440 /
    3840×2160. F11 (or `--windowed`) toggles to a windowed mode for
    iteration. Configured in M9.
-4. **Default theme.** Parchment. Dark and blood ship as player-selectable
-   variations in the existing settings screen.
+4. **Theme.** Dark only (leather + candlelight palette). Parchment and
+   Blood dropped from scope during M5; no runtime theme switcher.
 
 ### Open questions for the user / project lead