refactor(theme): remove wood themes from core theme system

- Remove wood-light, wood-dark, wood-mahogany from ThemeType
- Remove wood theme gradient logic from applyTheme()
- Wood themes will be reimplemented as separate paneling feature
- Paneling will target dashboard bookshelf background only

web/src/theme.ts

@@ -11,10 +11,7 @@ type ThemeType =
     | 'catppuccin-mocha'
     | 'catppuccin-macchiato'
     | 'catppuccin-frappe'
-    | 'catppuccin-latte'
-    | 'wood-light'
-    | 'wood-dark'
-    | 'wood-mahogany';
+    | 'catppuccin-latte';
 
 const DEFAULT_THEME: ThemeType = 'tokyo-night';
 const THEME_STORAGE_KEY = 'theme';
@@ -22,35 +19,11 @@ const TOKEN_STORAGE_KEY = 'token';
 
 // Apply theme to document body
 const applyTheme = (theme: string): void => {
-    // Handle wood themes with gradients
-    if (theme.startsWith('wood-')) {
-        document.body.className = `theme-${theme}`;
-
-        let woodGradient = '';
-        switch (theme) {
-            case 'wood-light':
-                woodGradient = 'linear-gradient(135deg, #deb887 0%, #d2a679 50%, #c9975b 100%)';
-                break;
-            case 'wood-dark':
-                woodGradient = 'linear-gradient(135deg, #8b7355 0%, #6b5344 50%, #5a4636 100%)';
-                break;
-            case 'wood-mahogany':
-                woodGradient = 'linear-gradient(135deg, #a0522d 0%, #8b4513 50%, #7a3c10 100%)';
-                break;
-            default:
-                woodGradient = '';
-        }
-
-        document.body.style.background = woodGradient;
-        document.body.style.backgroundSize = 'cover';
-        document.body.style.backgroundAttachment = 'fixed';
-    } else {
-        // Apply regular theme
-        document.body.className = `theme-${theme}`;
-        document.body.style.background = '';
-        document.body.style.backgroundSize = '';
-        document.body.style.backgroundAttachment = '';
-    }
+    // Apply regular theme only
+    document.body.className = `theme-${theme}`;
+    document.body.style.background = '';
+    document.body.style.backgroundSize = '';
+    document.body.style.backgroundAttachment = '';
 
     localStorage.setItem(THEME_STORAGE_KEY, theme);
 };