fix(05): convert flat i18n widget keys to nested structure for next-intl

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

apps/web/src/messages/en.json

@@ -122,28 +122,36 @@
     "saveChanges": "Save changes",
     "layoutLoadError": "Could not load dashboard. Please reload the page.",
     "widgetSaveError": "Could not save changes. Please try again.",
-    "clock.name": "Clock",
-    "clock.description": "Shows the current time",
-    "clock.dateHint": "Show date",
-    "search.name": "Search",
-    "search.description": "Quick web search",
-    "search.placeholder": "Search...",
-    "calendar.name": "Calendar",
-    "calendar.description": "Upcoming events",
-    "calendar.loading": "Loading...",
-    "calendar.emptyNoSources": "No calendar sources configured",
-    "calendar.emptyNoEvents": "No upcoming events",
-    "calendar.connectionSuccess": "Connection successful",
-    "calendar.connectionError": "Connection failed. Please check the URL and credentials.",
-    "calendar.addSource": "Add source",
-    "calendar.sourceEmpty": "No calendar sources configured. Add a source to display events.",
-    "note.name": "Notes",
-    "note.description": "Free-text notes with Markdown",
-    "note.defaultTitle": "Note",
-    "note.autosaveError": "Save failed",
-    "search.providers": "Search Providers",
-    "search.addProvider": "Add Custom Provider",
-    "search.addProviderButton": "Add Provider"
+    "clock": {
+      "name": "Clock",
+      "description": "Shows the current time",
+      "dateHint": "Show date"
+    },
+    "search": {
+      "name": "Search",
+      "description": "Quick web search",
+      "placeholder": "Search...",
+      "providers": "Search Providers",
+      "addProvider": "Add Custom Provider",
+      "addProviderButton": "Add Provider"
+    },
+    "calendar": {
+      "name": "Calendar",
+      "description": "Upcoming events",
+      "loading": "Loading...",
+      "emptyNoSources": "No calendar sources configured",
+      "emptyNoEvents": "No upcoming events",
+      "connectionSuccess": "Connection successful",
+      "connectionError": "Connection failed. Please check the URL and credentials.",
+      "addSource": "Add source",
+      "sourceEmpty": "No calendar sources configured. Add a source to display events."
+    },
+    "note": {
+      "name": "Notes",
+      "description": "Free-text notes with Markdown",
+      "defaultTitle": "Note",
+      "autosaveError": "Save failed"
+    }
   },
   "admin": {
     "users": {