feat(dashboard): add share button with clipboard fallback

dictionaries/de.json

@@ -38,6 +38,10 @@
         "instructionsTitle": "Katzenpflege-Anleitungen",
         "export": "Exportieren",
         "settings": "Einstellungen",
+        "share": "Teilen",
+        "shareTitle": "Plan teilen",
+        "copySuccess": "Link kopiert!",
+        "shareError": "Fehler beim Teilen.",
         "feeding": "Füttern",
         "litter": "Klo reinigen",
         "ownerHome": "Besitzer zu Hause",

dictionaries/en.json

@@ -38,6 +38,10 @@
         "instructionsTitle": "Cat Care Instructions",
         "export": "Export",
         "settings": "Settings",
+        "share": "Share",
+        "shareTitle": "Share Plan",
+        "copySuccess": "Link copied to clipboard!",
+        "shareError": "Could not share plan.",
         "feeding": "Feeding",
         "litter": "Clean litter",
         "ownerHome": "Owner Home",