fix: add missing formatBytes helper function

The formatBytes function was used in the view but never defined, causing
a runtime error. This function was needed to display S3 file sizes in
human-readable format (e.g., "1.5 MB" instead of "1572864").

Added formatBytes() helper to bootstrap/helpers/shared.php:
- Converts bytes to human-readable format (B, KB, MB, GB, TB, PB)
- Uses base 1024 for proper binary conversion
- Configurable precision (defaults to 2 decimal places)
- Handles zero bytes case

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Models/InstanceSettings.php

@@ -35,7 +35,7 @@ class InstanceSettings extends Model
     protected static function booted(): void
     {
         static::updated(function ($settings) {
-            if ($settings->wasChanged('helper_version')) {
+            if ($settings->wasChanged('helper_version') || $settings->wasChanged('dev_helper_version')) {
                 Server::chunkById(100, function ($servers) {
                     foreach ($servers as $server) {
                         PullHelperImageJob::dispatch($server);