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

README.md

@@ -25,6 +25,11 @@
   <img src="https://img.shields.io/badge/Desktop_App-Windows%20%7C%20macOS%20%7C%20Linux-blue?style=for-the-badge" alt="Desktop Apps" />
 </p>
 
+<p>
+  <img src="https://img.shields.io/badge/Portable-No_Installation_Required-success?style=for-the-badge&logo=windows-terminal&logoColor=white" alt="Portable" />
+  <img src="https://img.shields.io/badge/Zero_Registry-Leave_No_Trace-orange?style=for-the-badge" alt="No Registry" />
+</p>
+
 <p>
   <img src="https://img.shields.io/badge/license-MIT-green?style=flat-square" alt="License" />
   <img src="https://img.shields.io/badge/PRs-welcome-brightgreen?style=flat-square" alt="PRs Welcome" />
@@ -146,12 +151,29 @@ Every style includes meticulously configured:
 
 ## 🚀 Quick Start
 
-### Option 1: Download Desktop App (Recommended)
+### Option 1: Portable Download (Recommended) 🎒
 
-Pre-built binaries coming soon for:
-- 🪟 **Windows** (.msi, .exe)
-- 🍎 **macOS** (.dmg, .app)  
-- 🐧 **Linux** (.deb, .rpm, .AppImage)
+**TypoGenie is fully portable** — no installation, no registry entries, no files scattered across your system.
+
+Just download and run:
+- 🪟 **Windows**: `TypoGenie.exe` — Single executable, runs immediately
+- 🍎 **macOS**: `TypoGenie.app` — Drag and run
+- 🐧 **Linux**: `TypoGenie.AppImage` — Make executable and run
+
+**How it works:**
+```
+📁 Your Folder/
+├── 🚀 TypoGenie.exe          ← Run this
+└── 📂 TypoGenie-Data/        ← Auto-created on first run
+    ├── config.json           ← Your settings
+    └── cache/                ← Temporary files
+```
+
+✅ **No installer** — Just double-click the EXE  
+✅ **No registry** — Windows registry untouched  
+✅ **No AppData** — Everything stays in the same folder  
+✅ **USB-friendly** — Run from a thumb drive anywhere  
+✅ **Easy backup** — Copy the whole folder, done
 
 ### Option 2: Build from Source
 
@@ -189,7 +211,24 @@ npm run desktop
 npm run desktop:build
 ```
 
-The built apps will be in `src-tauri/target/release/bundle/`
+**Build outputs:**
+
+| Platform | Output Location | Result |
+|----------|----------------|--------|
+| **Windows** | `src-tauri/target/release/typogenie.exe` | ⚡ **Portable EXE** — Run immediately, no install |
+| **Windows** | `src-tauri/target/release/bundle/nsis/*.exe` | 📦 NSIS Installer (optional) |
+| **macOS** | `src-tauri/target/release/bundle/dmg/*.dmg` | 🍎 DMG with App bundle |
+| **Linux** | `src-tauri/target/release/bundle/appimage/*.AppImage` | 🐧 Portable AppImage |
+
+**For the truly portable Windows experience:**
+```bash
+# After building, grab the raw EXE:
+copy src-tauri\target\release\typogenie.exe "C:\Path\To\Your\Portable\Folder\"
+
+# Run it:
+"C:\Path\To\Your\Portable\Folder\typogenie.exe"
+# Creates TypoGenie-Data/ folder next to EXE automatically
+```
 
 ### Usage