Migrate from npm to pnpm across entire project

• Update all GitHub workflow files to use pnpm instead of npm
• Replace npm commands with pnpm equivalents in devcontainer scripts
• Remove package-lock.json files and update to use pnpm-lock.yaml
• Consolidate node version references to use server/.nvmrc

web/package.json

@@ -50,13 +50,13 @@
     "justified-layout": "^4.1.0",
     "lodash-es": "^4.17.21",
     "luxon": "^3.4.4",
-    "maplibre-gl": "^5.3.0",
+    "maplibre-gl": "^5.6.2",
     "pmtiles": "^4.3.0",
     "qrcode": "^1.5.4",
     "socket.io-client": "~4.8.0",
     "svelte-gestures": "^5.1.3",
     "svelte-i18n": "^4.0.1",
-    "svelte-maplibre": "^1.0.0",
+    "svelte-maplibre": "^1.2.0",
     "svelte-persisted-store": "^0.12.0",
     "tabbable": "^6.2.0",
     "thumbhash": "^0.1.1"