fix: add toast classes to Bootstrap subset safelist

The toast from IP View Limit plugin uses Bootstrap classes that weren't
being detected because PurgeCSS only scans theme files, not plugins.

Added to safelist: toast-container, toast, toast-body, position-fixed,
bottom-0, end-0, text-dark, bg-warning, btn-close, m-auto

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

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

build-bootstrap-subset.js

@@ -171,6 +171,18 @@ async function buildBootstrapSubset() {
                     'w-auto',
                     'h-100',
                     'h-auto',
+
+                    // Toast classes (plugin IP View Limit)
+                    'toast-container',
+                    'toast',
+                    'toast-body',
+                    'position-fixed',
+                    'bottom-0',
+                    'end-0',
+                    'text-dark',
+                    'bg-warning',
+                    'btn-close',
+                    'm-auto',
                 ],
 
                 deep: [