feat(disk_analyzer_cli): left/right arrow navigation in list view

Right arrow opens the selected folder (like Enter); left arrow goes
back (like Backspace/Esc).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: orestesgaolin

disk_analyzer_cli/README.md

@@ -69,8 +69,8 @@ disk_analyzer_cli tui /Users/dominik
 | Key                 | Action                                |
 | ------------------- | ------------------------------------- |
 | `↑` `↓`             | Navigate entries                      |
-| `Enter`             | Open folder                           |
-| `Backspace` / `Esc` | Go back (restores previous selection) |
+| `Enter` / `→`       | Open folder                           |
+| `Backspace` / `Esc` / `←` | Go back (restores previous selection) |
 | `s`                 | Scan selected folder (background)     |
 | `a`                 | Scan all unscanned folders            |
 | `o`                 | Open in Finder                        |

disk_analyzer_cli/lib/src/display/tui_app.dart

@@ -490,12 +490,17 @@ class _DiskUsageAppState extends State<DiskUsageApp> {
           _scrollToSelected();
           return true;
         }
-        if (event.logicalKey == LogicalKey.enter) {
+        if (event.logicalKey == LogicalKey.enter ||
+            event.logicalKey == LogicalKey.arrowRight) {
           if (_entries.isNotEmpty && _entries[_selectedIndex].isDirectory) {
             _navigateInto(_entries[_selectedIndex]);
           }
           return true;
         }
+        if (event.logicalKey == LogicalKey.arrowLeft) {
+          _navigateBack();
+          return true;
+        }
         // s = scan selected
         if (event.logicalKey == LogicalKey.keyS) {
           _scanSelected();
@@ -1050,7 +1055,7 @@ class _DiskUsageAppState extends State<DiskUsageApp> {
             child: Text(
               _showTreemap
                   ? '\u{2191}\u{2193}\u{2190}\u{2192} Move  \u{23ce} Open  s Scan  o Finder  r Reload  \u{232b} Back  t/Esc Close'
-                  : '\u{2191}\u{2193} Nav  \u{23ce} Open  \u{232b} Back  s Scan  a All  o Finder  t Treemap  , Settings  q Quit',
+                  : '\u{2191}\u{2193} Nav  \u{2192}/\u{23ce} Open  \u{2190}/\u{232b} Back  s Scan  a All  o Finder  t Treemap  , Settings  q Quit',
               style: TextStyle(color: Colors.gray),
               overflow: TextOverflow.ellipsis,
               maxLines: 1,