feat: add smart font colors for wood paneling backgrounds

- Add data-wood attribute to collections container for CSS targeting
- Update woodPaneling.ts and woodPanelingInit.ts to set/remove attribute
- Add CSS variables for wood-specific text colors (dark text on light wood, light text on dark wood)
- Add !important rules to override theme colors when wood is active
- Replace wood-dark and wood-mahogany textures with darker variants
- Add subtle borders to book cards on wood backgrounds

web/src/woodPanelingInit.ts

@@ -11,6 +11,7 @@ const WOOD_INIT_STORAGE_KEY = 'wood-paneling';
             const container = document.getElementById('collections-container');
             if (container) {
                 container.classList.add(`bg-${woodPaneling}`);
+                container.setAttribute('data-wood', woodPaneling);
             }
         };