V2 Tauri integration (#3854)

# Description of Changes

Please provide a summary of the changes, including:

## Add PDF File Association Support for Tauri App

  ### 🎯 **Features Added**
  - PDF file association configuration in Tauri
  - Command line argument detection for opened files
  - Automatic file loading when app is launched via "Open with"
  - Cross-platform support (Windows/macOS)

  ### 🔧 **Technical Changes**
  - Added `fileAssociations` in `tauri.conf.json` for PDF files
  - New `get_opened_file` Tauri command to detect file arguments
  - `fileOpenService` with Tauri fs plugin integration
  - `useOpenedFile` hook for React integration
  - Improved backend health logging during startup (reduced noise)

  ### 🧪 **Testing**
See 
* https://v2.tauri.app/start/prerequisites/
*
[DesktopApplicationDevelopmentGuide.md](DesktopApplicationDevelopmentGuide.md)

  ```bash
  # Test file association during development:
  
  cd frontend
  npm install
  cargo tauri dev --no-watch -- -- "path/to/file.pdf"
  ```

 For production testing:
  1. Build: npm run tauri build
  2. Install the built app
  3. Right-click PDF → "Open with" → Stirling-PDF

  🚀 User Experience

- Users can now double-click PDF files to open them directly in
Stirling-PDF
- Files automatically load in the viewer when opened via file
association
  - Seamless integration with OS file handling

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: Connor Yoh <[email protected]>
Co-authored-by: James Brunton <[email protected]>
Co-authored-by: James Brunton <[email protected]>

frontend/package.json

@@ -25,6 +25,8 @@
     "@embedpdf/plugin-viewport": "^1.3.14",
     "@embedpdf/plugin-zoom": "^1.3.14",
     "@emotion/react": "^11.14.0",
+    "@tauri-apps/api": "^2.5.0",
+    "@tauri-apps/plugin-fs": "^2.4.0",
     "@emotion/styled": "^11.14.1",
     "@iconify/react": "^6.0.2",
     "@mantine/core": "^8.3.1",
@@ -62,10 +64,13 @@
     "lint": "eslint --max-warnings=0",
     "build": "vite build",
     "preview": "vite preview",
-    "typecheck": "tsc --noEmit",
+    "tauri-dev": "tauri dev --no-watch",
+    "tauri-build": "tauri build",
+    "typecheck": "npm run typecheck:proprietary",
     "typecheck:core": "tsc --noEmit --project tsconfig.core.json",
     "typecheck:proprietary": "tsc --noEmit --project tsconfig.proprietary.json",
-    "typecheck:all": "npm run typecheck:core && npm run typecheck:proprietary",
+    "typecheck:desktop": "tsc --noEmit --project tsconfig.desktop.json",
+    "typecheck:all": "npm run typecheck:core && npm run typecheck:proprietary && npm run typecheck:desktop",
     "check": "npm run typecheck && npm run lint && npm run test:run",
     "generate-licenses": "node scripts/generate-licenses.js",
     "generate-icons": "node scripts/generate-icons.js",
@@ -103,6 +108,7 @@
     ]
   },
   "devDependencies": {
+    "@tauri-apps/cli": "^2.5.0",
     "@eslint/js": "^9.36.0",
     "@iconify-json/material-symbols": "^1.2.37",
     "@iconify/utils": "^3.0.2",