feat(api): recursively calculate directory sizes for public share folders and display on UI

backend/handlers/sharing.go

@@ -229,9 +229,25 @@ func (h *ShareHandler) GetPublicShare(c *fiber.Ctx) error {
 		mimeType = "application/octet-stream"
 	}
 
+	getDirSize := func(p string) int64 {
+		var s int64
+		filepath.Walk(p, func(_ string, i os.FileInfo, err error) error {
+			if err == nil && !i.IsDir() {
+				s += i.Size()
+			}
+			return nil
+		})
+		return s
+	}
+
+	size := info.Size()
+	if info.IsDir() {
+		size = getDirSize(fullPath)
+	}
+
 	response := fiber.Map{
 		"name":      info.Name(), // Use info.Name() instead of base of original path
-		"size":      info.Size(),
+		"size":      size,
 		"is_dir":    info.IsDir(),
 		"mime_type": mimeType,
 	}
@@ -249,9 +265,13 @@ func (h *ShareHandler) GetPublicShare(c *fiber.Ctx) error {
 				if eMime == "" {
 					eMime = "application/octet-stream"
 				}
+				entrySize := entryInfo.Size()
+				if entry.IsDir() {
+					entrySize = getDirSize(filepath.Join(fullPath, entry.Name()))
+				}
 				files = append(files, fiber.Map{
 					"name":      entry.Name(),
-					"size":      entryInfo.Size(),
+					"size":      entrySize,
 					"is_dir":    entry.IsDir(),
 					"mime_type": eMime,
 				})

frontend/src/app/share/[id]/page.tsx

@@ -247,7 +247,7 @@ export default function PublicSharePage({ params }: { params: Promise<{ id: stri
                   className="flex items-center gap-2 px-5 py-2.5 rounded-xl font-medium transition-all hover:bg-white/10 bg-white/5 border border-white/10 text-white shadow-lg"
                 >
                   <Download className="w-4 h-4" />
-                  Download ZIP
+                  Download ZIP ({formatSize(fileInfo?.size || 0)})
                 </button>
               </div>
             )}
@@ -287,7 +287,7 @@ export default function PublicSharePage({ params }: { params: Promise<{ id: stri
                   style={{ background: 'linear-gradient(135deg, #6366f1, #8b5cf6)' }}
                 >
                   <Download className="w-5 h-5" />
-                  Download File
+                  Download File ({formatSize(fileInfo?.size || 0)})
                 </button>
               </div>
             ) : (
@@ -326,7 +326,7 @@ export default function PublicSharePage({ params }: { params: Promise<{ id: stri
                             </span>
                           </td>
                           <td className="py-4 text-white/50 text-sm">
-                            {f.is_dir ? '--' : formatSize(f.size)}
+                            {formatSize(f.size)}
                           </td>
                           <td className="py-4 pr-4 text-right">
                             <button