feat: add new dashboard components and enhance UI

- Introduced new CSS variables for light theme in `globals.css` to improve visual consistency.
- Replaced `Card` component with `StatCard`, `ProgressBar`, and `MetricCard` in `DashboardStats`, `ProductivityAnalytics`, and `RecentTasks` for better modularity and reusability.
- Updated `QuickActions` to use `ActionCard` for a more cohesive design.
- Enhanced `Badge` and `Button` components with new variants for improved styling options.
- Added new UI showcase section in `UIShowcaseClient` to demonstrate the new dashboard components.

src/components/dashboard/QuickActions.tsx

@@ -1,10 +1,9 @@
 'use client';
 
 import { useState } from 'react';
-import { Button } from '@/components/ui/Button';
+import { ActionCard } from '@/components/ui';
 import { CreateTaskForm } from '@/components/forms/CreateTaskForm';
 import { CreateTaskData } from '@/clients/tasks-client';
-import Link from 'next/link';
 
 interface QuickActionsProps {
   onCreateTask: (data: CreateTaskData) => Promise<void>;
@@ -21,65 +20,54 @@ export function QuickActions({ onCreateTask }: QuickActionsProps) {
   return (
     <>
       <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 mb-8">
-        <Button
-          variant="primary"
+        <ActionCard
+          title="Nouvelle Tâche"
+          description="Créer une nouvelle tâche"
+          icon={
+            <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
+            </svg>
+          }
           onClick={() => setIsCreateModalOpen(true)}
-          className="flex items-center gap-2 p-6 h-auto"
-        >
-          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
-          </svg>
-          <div className="text-left">
-            <div className="font-semibold">Nouvelle Tâche</div>
-            <div className="text-sm opacity-80">Créer une nouvelle tâche</div>
-          </div>
-        </Button>
+          variant="primary"
+        />
 
-        <Link href="/kanban">
-          <Button
-            variant="secondary"
-            className="flex items-center gap-2 p-6 h-auto w-full"
-          >
+        <ActionCard
+          title="Kanban Board"
+          description="Gérer les tâches"
+          icon={
             <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 17V7m0 10a2 2 0 01-2 2H5a2 2 0 01-2-2V7a2 2 0 012-2h2a2 2 0 012 2m0 10a2 2 0 002 2h2a2 2 0 002-2M9 7a2 2 0 012-2h2a2 2 0 012 2m0 0V5a2 2 0 012-2h2a2 2 0 002-2" />
             </svg>
-            <div className="text-left">
-              <div className="font-semibold">Kanban Board</div>
-              <div className="text-sm opacity-80">Gérer les tâches</div>
-            </div>
-          </Button>
-        </Link>
+          }
+          href="/kanban"
+          variant="secondary"
+        />
 
-        <Link href="/daily">
-          <Button
-            variant="secondary"
-            className="flex items-center gap-2 p-6 h-auto w-full"
-          >
+        <ActionCard
+          title="Daily"
+          description="Checkboxes quotidiennes"
+          icon={
             <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z" />
             </svg>
-            <div className="text-left">
-              <div className="font-semibold">Daily</div>
-              <div className="text-sm opacity-80">Checkboxes quotidiennes</div>
-            </div>
-          </Button>
-        </Link>
+          }
+          href="/daily"
+          variant="secondary"
+        />
 
-        <Link href="/settings">
-          <Button
-            variant="secondary"
-            className="flex items-center gap-2 p-6 h-auto w-full"
-          >
+        <ActionCard
+          title="Paramètres"
+          description="Configuration"
+          icon={
             <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
             </svg>
-            <div className="text-left">
-              <div className="font-semibold">Paramètres</div>
-              <div className="text-sm opacity-80">Configuration</div>
-            </div>
-          </Button>
-        </Link>
+          }
+          href="/settings"
+          variant="secondary"
+        />
       </div>
 
       <CreateTaskForm