feat(ui): add size and variant props to Input component

- add `size` prop (sm | md | lg) with corresponding tailwind size classes
- add `variant` prop supporting `default` and `ghost` styles
- add focus state tracking to enable ghost→default transition on focus
- forward `onFocus` and `onBlur` callbacks with internal focus handling
- isolate color input styling from size/variant logic

src/shared/components/Input.js

@@ -1,6 +1,6 @@
 'use client';
 
-import React from 'react';
+import React, { useState } from 'react';
 
 const Input = ({
     type = 'text',
@@ -16,11 +16,33 @@ const Input = ({
     min,
     max,
     step,
+    size = 'md',
+    variant = 'default',
+    onFocus,
+    onBlur,
     ...props
 }) => {
-    const baseInputClassName = `w-full px-[10px] py-[7px] rounded-lg text-[13px] focus:outline-none transition-all duration-[120ms] ease-out disabled:opacity-50 disabled:cursor-not-allowed bg-white border border-neutral-300 text-neutral-900 placeholder-neutral-400 focus:border-neutral-500 focus:ring-1 focus:ring-neutral-500/20 dark:bg-neutral-900/60 dark:border-neutral-700/50 dark:text-white dark:placeholder-neutral-500 dark:focus:border-neutral-600 dark:focus:ring-neutral-600/20 ${
-        error ? 'border-red-500/50 dark:border-red-500/50' : ''
-    } ${className}`;
+    const [focused, setFocused] = useState(false);
+
+    const sizeClasses = {
+        sm: 'px-[8px] py-[5px] text-[12px]',
+        md: 'px-[10px] py-[7px] text-[13px]',
+        lg: 'px-[14px] py-[10px] text-[20px] font-semibold',
+    };
+
+    const defaultVariant = 'bg-white border border-neutral-300 text-neutral-900 placeholder-neutral-400 focus:border-neutral-500 focus:ring-1 focus:ring-neutral-500/20 dark:bg-neutral-900/60 dark:border-neutral-700/50 dark:text-white dark:placeholder-neutral-500 dark:focus:border-neutral-600 dark:focus:ring-neutral-600/20';
+
+    // Ghost : bordure transparente + texte gris au repos. Au focus, prend l'apparence default.
+    const ghostRest = 'bg-transparent border border-transparent text-neutral-500 placeholder-neutral-400 dark:text-neutral-400 dark:placeholder-neutral-600';
+    const ghostFocus = defaultVariant;
+
+    const variantClasses = variant === 'ghost'
+        ? (focused ? ghostFocus : ghostRest)
+        : defaultVariant;
+
+    const errorClasses = error ? 'border-red-500/50 dark:border-red-500/50' : '';
+
+    const baseInputClassName = `w-full rounded-lg focus:outline-none transition-all duration-[120ms] ease-out disabled:opacity-50 disabled:cursor-not-allowed ${sizeClasses[size] || sizeClasses.md} ${variantClasses} ${errorClasses} ${className}`;
 
     const handleChange = (e) => {
         let newValue = e.target.value;
@@ -42,7 +64,19 @@ const Input = ({
         onChange?.(newValue);
     };
 
-    // Enhanced color input renderer
+    const handleFocus = (e) => {
+        setFocused(true);
+        onFocus?.(e);
+    };
+
+    const handleBlur = (e) => {
+        setFocused(false);
+        onBlur?.(e);
+    };
+
+    // Color input — non concerné par size/variant, garde son apparence dédiée.
+    const colorBaseClassName = `w-full px-[10px] py-[7px] rounded-lg text-[13px] focus:outline-none transition-all duration-[120ms] ease-out disabled:opacity-50 disabled:cursor-not-allowed ${defaultVariant} ${errorClasses}`;
+
     const renderColorInput = () => {
         return (
             <div className="flex gap-2">
@@ -64,7 +98,7 @@ const Input = ({
                 </div>
                 <input
                     type="text"
-                    className={`${baseInputClassName} flex-1 min-w-0`}
+                    className={`${colorBaseClassName} flex-1 min-w-0`}
                     value={value || ''}
                     onChange={handleChange}
                     placeholder={placeholder || 'Enter hex color'}
@@ -91,6 +125,8 @@ const Input = ({
                     type={type}
                     value={value}
                     onChange={handleChange}
+                    onFocus={handleFocus}
+                    onBlur={handleBlur}
                     placeholder={placeholder}
                     className={baseInputClassName}
                     disabled={disabled}