merge nostrized-events module into unified main

Adds the standalone activities/events PWA build:
- vite.activities.config.ts (standalone entry point)
- build:activities npm script
- i18n support (Spanish Latin American translations)
- Map/calendar UI improvements

Conflicts resolved keeping main-unified's module system
(links, tasks, expenses, di-container, navigation).

package.json

@@ -9,6 +9,9 @@
     "build": "vue-tsc -b && vite build",
     "preview": "vite preview --host",
     "analyze": "vite build --mode analyze",
+    "dev:activities": "vite --host --config vite.activities.config.ts",
+    "build:activities": "vue-tsc -b && vite build --config vite.activities.config.ts",
+    "preview:activities": "vite preview --host --config vite.activities.config.ts",
     "electron:dev": "concurrently \"vite --host\" \"electron-forge start\"",
     "electron:build": "vue-tsc -b && vite build && electron-builder",
     "electron:package": "electron-builder",
@@ -27,8 +30,10 @@
     "date-fns": "^4.1.0",
     "electron-squirrel-startup": "^1.0.1",
     "fuse.js": "^7.0.0",
+    "leaflet": "^1.9.4",
     "light-bolt11-decoder": "^3.2.0",
     "lucide-vue-next": "^0.474.0",
+    "ngeohash": "^0.6.3",
     "nostr-tools": "^2.10.4",
     "pinia": "^2.3.1",
     "qr-scanner": "^1.4.2",
@@ -57,6 +62,8 @@
     "@tailwindcss/forms": "^0.5.10",
     "@tailwindcss/typography": "^0.5.16",
     "@tailwindcss/vite": "^4.0.12",
+    "@types/leaflet": "^1.9.21",
+    "@types/ngeohash": "^0.6.8",
     "@types/node": "^22.18.1",
     "@types/qrcode": "^1.5.5",
     "@types/rollup-plugin-visualizer": "^4.2.3",