fix: color contrast dark mode and keyboard moadals

assets/js/app.js

@@ -94,6 +94,32 @@ Hooks.TableRowKeydown = {
   }
 }
 
+// FocusRestore hook: WCAG 2.4.3 — when a modal closes, focus returns to the trigger element (e.g. "Delete member" button)
+Hooks.FocusRestore = {
+  mounted() {
+    this.handleEvent("focus_restore", ({id}) => {
+      const el = document.getElementById(id)
+      if (el) el.focus()
+    })
+  }
+}
+
+// TabListKeydown hook: WCAG tab pattern — prevent default for ArrowLeft/ArrowRight so the server can handle tab switch (roving tabindex)
+Hooks.TabListKeydown = {
+  mounted() {
+    this.handleKeydown = (e) => {
+      if (e.key === 'ArrowLeft' || e.key === 'ArrowRight') {
+        e.preventDefault()
+      }
+    }
+    this.el.addEventListener('keydown', this.handleKeydown)
+  },
+
+  destroyed() {
+    this.el.removeEventListener('keydown', this.handleKeydown)
+  }
+}
+
 // SidebarState hook: Manages sidebar expanded/collapsed state
 Hooks.SidebarState = {
   mounted() {