feat(quick-261008-who): Vorladen schalten, Grenze acht mit gepinnten Modulen

- Offenhalten-Grenze fuenf auf acht, gepinnte Module nie per LRU verworfen
- Schalter in der App-Leiste der Modulansicht, Karte in Einstellungen -> Eigene Module
- Texte de/en

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

apps/web/src/messages/en.json

@@ -1661,6 +1661,18 @@
     "loadError": "This module could not be loaded. Please try again later.",
     "invalidUrl": "This module's address is not a valid https address and is therefore not shown.",
     "loading": "Loading …",
+    "preload": {
+      "toggle": "Preload at startup",
+      "limitReached": "At most {max} custom modules can be preloaded at startup. Turn off preloading for another module first.",
+      "saveError": "The setting could not be saved. Please try again.",
+      "settingsTitle": "Preload at startup",
+      "settingsDescription": "Tessera loads the selected modules invisibly in the background shortly after startup so they are ready the first time you open them. You can select at most {max} modules. The selection applies only to you, in the browser and in the desktop app.",
+      "count": "{count} of {max} selected",
+      "shared": "For everyone",
+      "personal": "Personal",
+      "empty": "There are no custom modules yet.",
+      "loadError": "The modules could not be loaded. Please reload the page."
+    },
     "form": {
       "create": "Add custom module",
       "edit": "Edit custom module",