feat: add JS-015 architecture rule to enforce confirm_modal over native confirm()

Prevents reintroduction of native browser confirm() dialogs by flagging
them as architecture errors during pre-commit validation. Points
developers to use confirm_modal/confirm_modal_dynamic Jinja2 macros.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.architecture-rules/frontend.yaml

@@ -238,6 +238,50 @@ javascript_rules:
       exceptions:
         - "utils.js"
 
+  - id: "JS-015"
+    name: "Use confirm_modal macros, not native confirm()"
+    severity: "error"
+    description: |
+      All confirmation dialogs must use the project's confirm_modal or
+      confirm_modal_dynamic Jinja2 macros from shared/macros/modals.html.
+      Never use the native browser confirm() dialog.
+
+      The modal macros provide:
+      - Consistent styled dialogs matching the admin/store theme
+      - Dark mode support
+      - Variant colors (danger=red, warning=yellow, info=blue)
+      - Icon support
+      - Double-confirm pattern for destructive operations
+
+      WRONG (native browser dialog):
+        if (!confirm('Are you sure you want to delete this?')) return;
+        if (!confirm(I18n.t('confirmations.delete'))) return;
+
+      RIGHT (state variable + modal macro):
+        // In JS: add state variable and remove confirm() guard
+        showDeleteModal: false,
+        async deleteItem() {
+            // No confirm() guard — modal already confirmed
+            await apiClient.delete('/admin/items/' + this.item.id);
+        }
+
+        // In template: button sets state, macro shows modal
+        <button @click="showDeleteModal = true">Delete</button>
+        {{ confirm_modal('deleteModal', 'Delete Item', 'Are you sure?',
+           'deleteItem()', 'showDeleteModal', 'Delete', 'Cancel', 'danger') }}
+
+      For dynamic messages (containing JS expressions):
+        {{ confirm_modal_dynamic('deleteModal', 'Delete Item',
+           "'Delete ' + item.name + '?'",
+           'deleteItem()', 'showDeleteModal', 'Delete', 'Cancel', 'danger') }}
+    pattern:
+      file_pattern: "static/**/js/**/*.js"
+      anti_patterns:
+        - "confirm\\("
+      exceptions:
+        - "utils.js"
+        - "vendor/"
+
   - id: "JS-010"
     name: "Use PlatformSettings for pagination rows per page"
     severity: "error"

scripts/validate/validate_architecture.py

@@ -482,6 +482,9 @@ class ArchitectureValidator:
         # JS-009: Check for alert() or window.showToast instead of Utils.showToast()
         self._check_toast_usage(file_path, content, lines)
 
+        # JS-015: Check for native confirm() instead of confirm_modal macros
+        self._check_confirm_usage(file_path, content, lines)
+
     def _check_toast_usage(self, file_path: Path, content: str, lines: list[str]):
         """JS-009: Check for alert() or window.showToast instead of Utils.showToast()"""
         # Skip utils.js (where showToast is defined)
@@ -529,6 +532,44 @@ class ArchitectureValidator:
                     suggestion="Replace window.showToast('msg', 'type') with Utils.showToast('msg', 'type')",
                 )
 
+    def _check_confirm_usage(self, file_path: Path, content: str, lines: list[str]):
+        """JS-015: Check for native confirm() instead of confirm_modal macros."""
+        # Skip utility files
+        if file_path.name in ("utils.js",):
+            return
+
+        # Skip vendor libraries
+        if "vendor/" in str(file_path):
+            return
+
+        # Check for file-level noqa comment
+        if "noqa: js-015" in content.lower():
+            return
+
+        for i, line in enumerate(lines, 1):
+            stripped = line.strip()
+
+            # Skip comments
+            if stripped.startswith(("//", "/*")):
+                continue
+
+            # Skip lines with inline noqa comment
+            if "noqa: js-015" in line.lower():
+                continue
+
+            # Check for confirm() usage
+            if re.search(r"\bconfirm\s*\(", line):
+                self._add_violation(
+                    rule_id="JS-015",
+                    rule_name="Use confirm_modal macros, not native confirm()",
+                    severity=Severity.ERROR,
+                    file_path=file_path,
+                    line_number=i,
+                    message="Native browser confirm() dialog - use confirm_modal/confirm_modal_dynamic macro",
+                    context=stripped[:80],
+                    suggestion="Add a state variable (e.g. showDeleteModal: false), set it in @click, and use confirm_modal macro in the template",
+                )
+
     def _check_alpine_data_spread(
         self, file_path: Path, content: str, lines: list[str]
     ):