feat: add slug-only dashboard profile filter and unify backend imports

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

@@ -73,6 +73,26 @@
     "admin_llm": "LLM Providers",
     "profile": "Profile"
   },
+  "health": {
+    "title": "Dashboard Health Center",
+    "subtitle": "Monitor the latest validation status across your environments.",
+    "environment_label": "Environment:",
+    "all_environments": "All Environments",
+    "validation_details": "Validation Details",
+    "table_dashboard": "Dashboard",
+    "table_environment": "Environment",
+    "table_status": "Status",
+    "table_last_check": "Last Check",
+    "table_summary": "Summary",
+    "no_records": "No validation records found.",
+    "no_records_for_environment": "No validation records found for this environment.",
+    "view_report": "View Report",
+    "load_failed": "Failed to load health summary",
+    "status_pass": "Pass",
+    "status_warn": "Warn",
+    "status_fail": "Fail",
+    "status_unknown": "Unknown"
+  },
   "llm": {
     "providers_title": "LLM Providers",
     "add_provider": "Add Provider",
@@ -428,6 +448,7 @@
     "superset_account": "Your Apache Superset Account",
     "superset_account_placeholder": "Enter your Apache Superset username",
     "show_only_my_dashboards": "Show only my dashboards by default",
+    "show_only_slug_dashboards": "Show only dashboards with slug 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.",
@@ -456,9 +477,9 @@
     "table_density_compact": "Compact",
     "table_density_comfortable": "Comfortable",
     "auto_open_task_drawer": "Automatically open task drawer for long-running tasks",
-    "filter_badge_active": "My Dashboards Only",
+    "filter_badge_active": "Profile filters active",
     "filter_badge_override": "Showing all dashboards temporarily",
-    "filter_empty_state": "No dashboards found for your account. Try adjusting your filter settings.",
+    "filter_empty_state": "No dashboards found for active profile filters. Try adjusting your filter settings.",
     "filter_show_all_temporarily": "Show all dashboards temporarily",
     "filter_restore_default": "Restore default filter",
     "saving": "Saving...",