feat(web): Dashboard mit Begruessung, Befehlsleiste und ruhigeren Kacheln

Begruessung nach Tageszeit mit Datum, Befehlsleiste oben rechts statt
schwebendem Knopf, einheitliche Kachel-Kopfzeilen mit Symbol, Kalender
mit Pfeilknoepfen, runden Tagen und Terminpunkten, Favoriten als
36-px-Zeilen bzw. App-Starter-Kacheln, Notiz-Kaestchen im Akzent,
leerer Zustand mit drei Vorschlaegen.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -136,11 +136,19 @@
       "uploadError": "The image could not be uploaded.",
       "presets": {
         "mist": "Mist",
-        "sage": "Sage",
         "bloom": "Bloom",
         "dunes": "Dunes",
-        "mosaic": "Mosaic"
+        "mosaic": "Mosaic",
+        "pebble": "Pebble"
       }
+    },
+    "greeting": {
+      "morning": "Good morning",
+      "day": "Good afternoon",
+      "evening": "Good evening",
+      "morningNamed": "Good morning, {name}",
+      "dayNamed": "Good afternoon, {name}",
+      "eveningNamed": "Good evening, {name}"
     }
   },
   "settings": {
@@ -270,8 +278,8 @@
       "emptyNoSources": "No calendar sources configured",
       "emptyNoEvents": "No upcoming events",
       "nothingSelected": "Nothing selected to display",
-      "monthPrev": "Back",
-      "monthNext": "Next",
+      "monthPrev": "Previous month",
+      "monthNext": "Next month",
       "monthToday": "Back to the current month",
       "upcomingTitle": "Upcoming events",
       "tooltipMore": "More events available",
@@ -454,6 +462,13 @@
       "serversLabel": "Servers shown",
       "serversHint": "With nothing selected, the tile shows all servers.",
       "chooseServers": "Choose servers"
+    },
+    "editShort": "Edit",
+    "done": "Done",
+    "toolbarLabel": "Dashboard actions",
+    "emptyState": {
+      "title": "Your dashboard is still empty",
+      "body": "Build your start page from tiles. For example:"
     }
   },
   "admin": {