add toasts, session usage tracking, and copy controls

package-lock.json

@@ -16,7 +16,8 @@
         "lucide-solid": "^0.300.0",
         "marked": "^12.0.0",
         "shiki": "^3.13.0",
-        "solid-js": "^1.8.0"
+        "solid-js": "^1.8.0",
+        "solid-toast": "^0.5.0"
       },
       "devDependencies": {
         "@tsconfig/bun": "^1.0.9",
@@ -6761,6 +6762,15 @@
         "solid-js": "^1.3"
       }
     },
+    "node_modules/solid-toast": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/solid-toast/-/solid-toast-0.5.0.tgz",
+      "integrity": "sha512-t770JakjyS2P9b8Qa1zMLOD51KYKWXbTAyJePVUoYex5c5FH5S/HtUBUbZAWFcqRCKmAE8KhyIiCvDZA8bOnxQ==",
+      "license": "MIT",
+      "peerDependencies": {
+        "solid-js": "^1.5.4"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",