chore: rename project to Tabletop Toolkit

- Update package name and binary from ttrpg-tools/ttrpg to tttk
- Update UI titles in App.tsx and index.html
- Add Node.js engine requirement to package.json

package-lock.json

@@ -1,11 +1,11 @@
 {
-  "name": "ttrpg-tools",
+  "name": "tttk",
   "version": "0.0.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "ttrpg-tools",
+      "name": "tttk",
       "version": "0.0.1",
       "license": "MIT",
       "dependencies": {
@@ -32,8 +32,7 @@
         "zod": "^4.4.3"
       },
       "bin": {
-        "ttrpg": "dist/cli/index.js",
-        "ttt": "dist/cli/index.js"
+        "tttk": "dist/cli/index.js"
       },
       "devDependencies": {
         "@rsbuild/core": "^1.1.8",
@@ -56,6 +55,9 @@
         "ts-node": "^10.9.2",
         "typescript": "^5.9.3",
         "webpack-bundle-analyzer": "^5.3.0"
+      },
+      "engines": {
+        "node": ">=18"
       }
     },
     "node_modules/@alloc/quick-lru": {