refactor(@projects/@magic-civilization): 🎨 shared PanelModal theme variations replace 4 inline modal styleboxes (p2-87)
Extend the type-variation pipeline to emit StyleBox variations, then dedup the
repeated "modal panel" stylebox (bg=background.panel, border=border.panel,
bw=2, corner=6) into shared Theme variations:
- PanelModal (no content margins) ← hotkey_sheet, tutorial_overlay, turn_notification
- PanelModalPadded (12/10 margins) ← statistics
4 inline StyleBoxFlat builds → theme_type_variation inheritance. Value-preserving
(variation stylebox == the inline geometry/colours). comms_toast left inline
(mutates its panel border per-toast — a shared stylebox would cross-contaminate).
Verified: PanelModal/Padded baked into ui_theme.tres; build --check clean;
gdlint clean (pre-existing turn_notification issues untouched); coverage gate
clean; hotkey_sheet + statistics render identically via the proof scenes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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