feat: Make app fully portable

- Add tauri-plugin-store for portable data storage
- Implement portable data directory (TypoGenie-Data/ next to EXE)
- Configure Rust backend to use EXE-relative paths
- Add store permissions for persistent settings
- Update README with portable badges and documentation
- Document how to build and use the portable EXE
- Zero registry, zero AppData, fully self-contained

src-tauri/tauri.conf.json

@@ -32,7 +32,7 @@
   },
   "bundle": {
     "active": true,
-    "targets": ["msi", "nsis", "dmg", "app", "deb", "rpm", "appimage"],
+    "targets": "all",
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",
@@ -41,15 +41,16 @@
       "icons/icon.ico"
     ],
     "category": "Productivity",
-    "shortDescription": "Markdown to Word document converter",
-    "longDescription": "TypoGenie is a free, open-source typesetting engine that transforms Markdown into beautifully formatted Microsoft Word documents with 40+ professional styles.",
+    "shortDescription": "Portable Markdown to Word document converter",
+    "longDescription": "TypoGenie is a free, open-source, portable typesetting engine. No installation required - just run the EXE. All data stays in the same folder.",
     "publisher": "TypoGenie Contributors",
     "copyright": "Copyright (c) 2026 TypoGenie Contributors",
     "license": "MIT",
     "homepage": "https://git.lashman.live/lashman/typogenie",
     "windows": {
-      "webviewInstallMode": {
-        "type": "embedBootstrapper"
+      "nsis": {
+        "installMode": "currentUser",
+        "installerIcon": "icons/icon.ico"
       }
     }
   }