feat(rbac): hide unauthorized menu sections and enforce route guards

frontend/src/lib/i18n/locales/en.json

@@ -69,7 +69,8 @@
     "admin_users": "User Management",
     "admin_roles": "Role Management",
     "admin_settings": "ADFS Configuration",
-    "admin_llm": "LLM Providers"
+    "admin_llm": "LLM Providers",
+    "profile": "Profile"
   },
   "llm": {
     "providers_title": "LLM Providers",
@@ -398,6 +399,32 @@
     "status_error": "Error",
     "empty": "No dashboards found"
   },
+  "profile": {
+    "title": "Profile",
+    "description": "Manage your dashboard filter preferences.",
+    "dashboard_preferences": "Dashboard Preferences",
+    "superset_environment": "Superset Environment",
+    "superset_environment_placeholder": "Select environment",
+    "superset_account": "Your Apache Superset Account",
+    "superset_account_placeholder": "Enter your Apache Superset username",
+    "show_only_my_dashboards": "Show only my dashboards by default",
+    "save_preferences": "Save Preferences",
+    "lookup_loading": "Loading Superset accounts...",
+    "lookup_error": "Cannot load Superset accounts for this environment right now. You can enter username manually.",
+    "save_success": "Preferences saved",
+    "save_error": "Failed to save preferences. Please try again.",
+    "invalid_username": "Username should not contain spaces. Please enter a valid Apache Superset username.",
+    "username_required": "Superset username is required when default filter is enabled.",
+    "filter_badge_active": "My Dashboards Only",
+    "filter_badge_override": "Showing all dashboards temporarily",
+    "filter_empty_state": "No dashboards found for your account. Try adjusting your filter settings.",
+    "filter_show_all_temporarily": "Show all dashboards temporarily",
+    "filter_restore_default": "Restore default filter",
+    "saving": "Saving...",
+    "lookup_button": "Lookup",
+    "lookup_search_placeholder": "Search account candidates",
+    "lookup_no_results": "No account candidates found. You can enter username manually."
+  },
   "reports": {
     "title": "Reports",
     "empty": "No reports available.",