style: remove hyphens from compound adjectives in comments and messages

Remove hyphens from compound adjectives such as "logged-in", "one-time", "password-protected", "full-height", "multi-file", and "S3-compatible" in comments, test error messages, and UI labels to improve readability and consistency.

backend/libs/handlers/icons.go

@@ -34,7 +34,7 @@ type mimeRule struct {
 	icon    fileIcon
 }
 
-// fileIconSet is the loaded icon map: an extension lookup plus content-type
+// fileIconSet is the loaded icon map: an extension lookup plus Content-Type
 // rules and a fallback. It is built once at startup from icon-map.json.
 type fileIconSet struct {
 	byExt    map[string]fileIcon
@@ -43,7 +43,7 @@ type fileIconSet struct {
 }
 
 // loadFileIcons reads static/file-icons/icon-map.json and indexes it by
-// extension and content type so icons can be assigned at render time.
+// extension and Content-Type so icons can be assigned at render time.
 func loadFileIcons(staticDir string) (*fileIconSet, error) {
 	data, err := os.ReadFile(filepath.Join(staticDir, "file-icons", "icon-map.json"))
 	if err != nil {
@@ -111,8 +111,8 @@ func validateFileIconPath(staticDir, theme, name string) error {
 }
 
 // lookup resolves a file's icon from its name (extension) first, falling back to
-// its content type, then to the default icon. Extension wins because stored
-// content types are often the generic application/octet-stream.
+// its Content-Type, then to the default icon. Extension wins because stored
+// Content-Types are often the generic application/octet-stream.
 func (s *fileIconSet) lookup(name, contentType string) fileIcon {
 	if s == nil {
 		return fileIcon{}