feat: enhance theme management and customization options

- Added support for multiple themes (dracula, monokai, nord, gruvbox, tokyo_night, catppuccin, rose_pine, one_dark, material, solarized) in the application.
- Updated `setTheme` function to accept the new `Theme` type, allowing for more flexible theme selection.
- Introduced `ThemeSelector` component in GeneralSettingsPage for user-friendly theme selection.
- Modified `ThemeProvider` to handle user preferred themes and improved theme toggling logic.
- Updated CSS variables in `globals.css` to support new themes, enhancing visual consistency across the app.

src/lib/types.ts

@@ -13,6 +13,9 @@ export type TaskStatus =
 export type TaskPriority = 'low' | 'medium' | 'high' | 'urgent';
 export type TaskSource = 'reminders' | 'jira' | 'tfs' | 'manual';
 
+// Types de thèmes partagés
+export type Theme = 'light' | 'dark' | 'dracula' | 'monokai' | 'nord' | 'gruvbox' | 'tokyo_night' | 'catppuccin' | 'rose_pine' | 'one_dark' | 'material' | 'solarized';
+
 // Interface centralisée pour les statistiques
 export interface TaskStats {
   total: number;
@@ -91,14 +94,13 @@ export interface ViewPreferences {
   showObjectives: boolean;
   showFilters: boolean;
   objectivesCollapsed: boolean;
-  theme: 'light' | 'dark';
+  theme: Theme;
   fontSize: 'small' | 'medium' | 'large';
   [key: string]:
     | boolean
     | 'tags'
     | 'priority'
-    | 'light'
-    | 'dark'
+    | Theme
     | 'small'
     | 'medium'
     | 'large'