feat(editor): flow list rows get icons + smarter byte formatting

The FLOWS sidebar entries showed just "name" + "1234 B" — two
plain lines, no glyph, no visual hierarchy. Replaced with:

  - leading 28×28 rounded icon tile (account_tree_outlined),
    accent-tinted when the row is active so selection reads
    at a glance.
  - active row title bumps to FontWeight.w600 + onSecondaryContainer.
  - sizes formatted compactly: bytes / KB / MB so a 4.3 KB
    flow doesn't render as "4321 B" and a long one doesn't
    overflow into a multi-line ellipsis.

Bumped to 0.20.1.

Signed-off-by: flemming-it <sf@flemming.it>

lib/src/flow_editor_page.dart

@@ -1051,6 +1051,17 @@ class _FlowFile {
   });
 }
 
+/// Compact byte-count formatter used in the flow-list rows.
+/// '12 B' / '4.3 KB' / '1.2 MB'. Avoids overflowing the
+/// narrow sidebar with raw byte counts on long flows.
+String _formatBytes(int bytes) {
+  if (bytes < 1024) return '$bytes B';
+  if (bytes < 1024 * 1024) {
+    return '${(bytes / 1024).toStringAsFixed(1)} KB';
+  }
+  return '${(bytes / (1024 * 1024)).toStringAsFixed(1)} MB';
+}
+
 class _FileList extends StatelessWidget {
   final Future<List<_FlowFile>> filesFuture;
   final String? activeName;
@@ -1161,20 +1172,57 @@ class _FileList extends StatelessWidget {
                     ),
                   ),
                 ),
+                child: Row(
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  children: [
+                    // Subtle leading icon that distinguishes a
+                    // flow file from any other row in the
+                    // sidebar. Active row gets the accent
+                    // colour, others stay muted so the active
+                    // selection reads at a glance.
+                    Container(
+                      width: 28,
+                      height: 28,
+                      margin: const EdgeInsets.only(right: FaiSpace.sm),
+                      decoration: BoxDecoration(
+                        color: isActive
+                            ? theme.colorScheme.primary.withValues(alpha: 0.15)
+                            : theme.colorScheme.surfaceContainerHigh,
+                        borderRadius: BorderRadius.circular(FaiRadius.sm),
+                      ),
+                      child: Icon(
+                        Icons.account_tree_outlined,
+                        size: 16,
+                        color: isActive
+                            ? theme.colorScheme.primary
+                            : theme.colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                    Expanded(
                       child: Column(
                         crossAxisAlignment: CrossAxisAlignment.start,
                         children: [
                           Text(
                             f.name,
                             style: theme.textTheme.bodyMedium?.copyWith(
-                        fontWeight: FontWeight.w500,
+                              fontWeight: isActive
+                                  ? FontWeight.w600
+                                  : FontWeight.w500,
+                              color: isActive
+                                  ? theme.colorScheme.onSecondaryContainer
+                                  : null,
                             ),
                             overflow: TextOverflow.ellipsis,
                           ),
+                          const SizedBox(height: 1),
                           Text(
-                      '${f.sizeBytes} B',
+                            _formatBytes(f.sizeBytes),
                             style: theme.textTheme.bodySmall?.copyWith(
                               color: theme.colorScheme.onSurfaceVariant,
+                              fontSize: 11,
+                            ),
+                          ),
+                        ],
                       ),
                     ),
                   ],

pubspec.yaml

@@ -1,6 +1,6 @@
 name: fai_studio_flow_editor
 description: Swappable inline YAML editor for F∆I Studio flows.
-version: 0.20.0
+version: 0.20.1
 publish_to: 'none'
 repository: https://git.flemming.ai/fai/studio-flow-editor