perf: Remove Tesseract OCR - saves ~45MB on mobile

- Removed Tesseract.js files from precache (~45MB)
- Scanner now uses only Gemini AI (more accurate, less data)
- Offline scans queued for later processing when online
- App download from ~50MB to ~5MB

BREAKING: Local offline OCR no longer available
Use Gemini AI instead (requires network for scanning)

public/sw.js

@@ -1,22 +1,13 @@
-const CACHE_NAME = 'whisky-vault-v19-offline';
+const CACHE_NAME = 'whisky-vault-v20-offline';
 
-// CONFIG: Assets
+// CONFIG: Assets - Only essential files, no heavy OCR (~2MB instead of ~50MB)
 const STATIC_ASSETS = [
     '/manifest.webmanifest',
     '/icon-192.png',
     '/icon-512.png',
     '/favicon.ico',
     '/lib/browser-image-compression.js',
-    // Tesseract OCR files for offline scanning (ALL variants for browser compatibility)
-    '/tessdata/worker.min.js',
-    '/tessdata/tesseract-core.wasm.js',
-    '/tessdata/tesseract-core-simd.wasm.js',
-    '/tessdata/tesseract-core-lstm.wasm.js',
-    '/tessdata/tesseract-core-simd-lstm.wasm.js',
-    '/tessdata/tesseract-core-relaxedsimd.wasm.js',
-    '/tessdata/tesseract-core-relaxedsimd-lstm.wasm.js',
-    '/tessdata/eng.traineddata',
-    '/tessdata/eng.traineddata.gz',
+    // NOTE: Tesseract OCR removed - Gemini AI is more accurate and data-efficient
 ];
 
 const CORE_PAGES = [