feat(preview): fix button layout and add mouse-following zoom

- Move close (X) button to far right, zoom button left of X
- File info (name + size) occupies the left of the top bar
- Zoom now follows the mouse cursor: transform-origin updates in
  real-time as the mouse moves, so 2.5× scale always magnifies
  the area under the pointer
- overflow-hidden on preview area keeps the scaled image contained

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

clube67/newwhats.local/frontend/components/FilePreviewModal.tsx

@@ -40,7 +40,10 @@ function ModalContent({ file, onConfirm, onCancel }: FilePreviewModalProps & { f
     const [sending, setSending]     = useState(false);
     const [objectUrl, setObjectUrl] = useState<string | null>(null);
     const [zoomed, setZoomed]       = useState(false);
+    // Posição do mouse como % dentro da área da imagem (para o zoom seguir o cursor)
+    const [mouseOrigin, setMouseOrigin] = useState({ x: 50, y: 50 });
     const captionRef = useRef<HTMLInputElement>(null);
+    const previewAreaRef = useRef<HTMLDivElement>(null);
 
     const isImage = file.type.startsWith('image/');
     const isVideo = file.type.startsWith('video/');
@@ -51,6 +54,7 @@ function ModalContent({ file, onConfirm, onCancel }: FilePreviewModalProps & { f
         setCaption('');
         setSending(false);
         setZoomed(false);
+        setMouseOrigin({ x: 50, y: 50 });
         setTimeout(() => captionRef.current?.focus(), 250);
         return () => URL.revokeObjectURL(url);
     }, [file]);
@@ -74,6 +78,17 @@ function ModalContent({ file, onConfirm, onCancel }: FilePreviewModalProps & { f
         if (e.key === 'Enter') { e.preventDefault(); handleSend(); }
     };
 
+    // Atualiza a origem do zoom conforme o mouse se move na área de preview
+    const handleMouseMove = useCallback((e: React.MouseEvent<HTMLDivElement>) => {
+        if (!isImage) return;
+        const rect = e.currentTarget.getBoundingClientRect();
+        const x = ((e.clientX - rect.left) / rect.width)  * 100;
+        const y = ((e.clientY - rect.top)  / rect.height) * 100;
+        setMouseOrigin({ x, y });
+    }, [isImage]);
+
+    const toggleZoom = useCallback(() => setZoomed(z => !z), []);
+
     return (
         <motion.div
             key="file-preview-overlay"
@@ -86,33 +101,39 @@ function ModalContent({ file, onConfirm, onCancel }: FilePreviewModalProps & { f
         >
             {/* ── Top bar ── */}
             <div className="flex items-center gap-3 px-4 py-3 bg-[#202c33] shrink-0 shadow-md">
-                <button
-                    onClick={onCancel}
-                    className="p-2 rounded-full hover:bg-white/10 text-[#aebac1] transition-colors shrink-0"
-                >
-                    <X className="w-5 h-5" />
-                </button>
-
+                {/* Info do arquivo — lado esquerdo */}
                 <div className="flex-1 min-w-0">
                     <p className="text-[#e9edef] text-sm font-medium truncate">{file.name}</p>
                     <p className="text-[#8696a0] text-xs">{getFileLabel(file.type)} · {formatFileSize(file.size)}</p>
                 </div>
 
+                {/* Botões — lado direito: zoom (se imagem) → fechar */}
+                <div className="flex items-center gap-1 shrink-0">
                     {isImage && (
                         <button
-                        onClick={() => setZoomed(z => !z)}
-                        className="p-2 rounded-full hover:bg-white/10 text-[#aebac1] transition-colors shrink-0"
+                            onClick={toggleZoom}
+                            className="p-2 rounded-full hover:bg-white/10 text-[#aebac1] transition-colors"
                             title={zoomed ? 'Zoom normal' : 'Ampliar'}
                         >
                             {zoomed ? <ZoomOut className="w-5 h-5" /> : <ZoomIn className="w-5 h-5" />}
                         </button>
                     )}
+                    <button
+                        onClick={onCancel}
+                        className="p-2 rounded-full hover:bg-white/10 text-[#aebac1] transition-colors"
+                        title="Fechar"
+                    >
+                        <X className="w-5 h-5" />
+                    </button>
+                </div>
             </div>
 
             {/* ── Preview area ── */}
             <div
-                className="flex-1 flex items-center justify-center min-h-0 overflow-auto p-4"
-                onClick={() => isImage && setZoomed(z => !z)}
+                ref={previewAreaRef}
+                className="flex-1 flex items-center justify-center min-h-0 overflow-hidden p-4"
+                onMouseMove={handleMouseMove}
+                onClick={isImage ? toggleZoom : undefined}
                 style={{ cursor: isImage ? (zoomed ? 'zoom-out' : 'zoom-in') : 'default' }}
             >
                 {isImage && objectUrl && (
@@ -122,12 +143,26 @@ function ModalContent({ file, onConfirm, onCancel }: FilePreviewModalProps & { f
                         initial={{ scale: 0.94, opacity: 0 }}
                         animate={{ scale: 1, opacity: 1 }}
                         transition={{ duration: 0.22 }}
-                        style={zoomed
-                            ? { maxWidth: 'none', maxHeight: 'none', width: 'auto', height: 'auto', cursor: 'zoom-out' }
-                            : { maxWidth: '100%', maxHeight: '100%', objectFit: 'contain', cursor: 'zoom-in' }
-                        }
-                        className="rounded-lg shadow-2xl select-none"
                         draggable={false}
+                        className="select-none rounded-lg shadow-2xl"
+                        style={zoomed ? {
+                            // Zoom 2.5× centrado no cursor
+                            transform: `scale(2.5)`,
+                            transformOrigin: `${mouseOrigin.x}% ${mouseOrigin.y}%`,
+                            transition: 'transform-origin 0s',   // origin segue o mouse instantaneamente
+                            maxWidth: '100%',
+                            maxHeight: 'calc(100vh - 160px)',
+                            objectFit: 'contain',
+                            cursor: 'zoom-out',
+                        } : {
+                            maxWidth: '100%',
+                            maxHeight: 'calc(100vh - 160px)',
+                            objectFit: 'contain',
+                            cursor: 'zoom-in',
+                            transition: 'transform 0.2s ease',
+                            transform: 'scale(1)',
+                            transformOrigin: 'center center',
+                        }}
                     />
                 )}