fix(core): remove unused finding categories

CHANGELOG.md

@@ -10,6 +10,9 @@ All notable changes to Diskern are documented here. The format follows
 
 - The CLI scan summary now says "1 file" instead of "1 files" when a
   scan sees exactly one file
+- Removed unused finding categories for duplicate files and empty folders,
+  since duplicates already have their own report section and empty folders are
+  not produced by the scanner
 
 ## [0.3.0] — 2026-09-12
 

app/src/App.jsx

@@ -12,8 +12,6 @@ const CATEGORY_LABEL = {
   temp_file: "Temporary files",
   log: "Logs",
   installer: "Old installers",
-  duplicate_file: "Duplicate file",
-  empty_directory: "Empty folders",
   system_critical: "System critical",
   unknown: "Unrecognized",
 };

crates/diskern-cli/src/main.rs

@@ -89,8 +89,6 @@ fn category_label(c: Category) -> &'static str {
         Category::TempFile => "Temporary files",
         Category::Log => "Logs",
         Category::Installer => "Installers",
-        Category::DuplicateFile => "Duplicate file",
-        Category::EmptyDirectory => "Empty folders",
         Category::SystemCritical => "System critical",
         Category::Unknown => "Unrecognized",
     }

crates/diskern-cli/tests/scan_roots.rs

@@ -99,7 +99,7 @@ fn scan_excludes_cli_directories() {
     );
     let stdout = String::from_utf8_lossy(&output.stdout);
     assert!(
-        stdout.contains("Scanned 1 files."),
+        stdout.contains("Scanned 1 file."),
         "expected excluded directory to be skipped, got: {stdout}"
     );
 }

crates/diskern-core/src/lib.rs

@@ -76,8 +76,6 @@ pub enum Category {
     TempFile,
     Log,
     Installer,
-    DuplicateFile,
-    EmptyDirectory,
     SystemCritical, // driver stores, OS components — never touch
     Unknown,
 }