Fix incomplete light theme surfaces

[Daren9m]

Summary

• make shared cards, accented panels, page heroes, form controls, filter groups, and empty states follow the active theme
• add theme-aware foreground tokens for bronze and difficulty surfaces
• apply the accessible accent foreground to bestiary pins and badges, spell pins, and the battle forecast icon

Why

Light mode changed the global text palette but several shared components still used hard-coded dark backgrounds. That produced dark cards with dark text across the Bestiary, Spells, Maps, Puzzles & Challenges, and Encounters pages.

The shared surface and control rules now use theme tokens, fixing every affected route while preserving dark mode.

Validation

• npm run typecheck -- --incremental false
• npm run lint
• npm test — 663 tests passed
• npm run build
• browser QA in light and dark modes across Bestiary, Spells, Maps, Puzzles & Challenges, and Encounters
• measured light-mode contrast: 15.37:1 primary card text, 6.90:1 secondary empty-state text, 6.00:1 selected bronze controls