fix(ocr): Fix mobile file upload ERR_NETWORK on Android/iOS

Clone file to memory immediately after selection to avoid SnapshotState
invalidation in W3C File API. Android/iOS browsers invalidate File object
references after accessing properties (name, size, type).

See: https://issues.chromium.org/40703873

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -420,6 +420,30 @@ const response = await api.get('/endpoint');
 → **Frontend**: Clear node_modules, check Node.js version (16+), Vite auto-ports
 → **Database**: Verify SSH tunnel, Oracle listener, credentials, test `/health`
 
+### Known Issues & Fixes
+
+#### Mobile File Upload ERR_NETWORK (Android/iOS)
+**Problem**: File uploads (OCR, attachments) fail with `ERR_NETWORK` (status 0) on mobile browsers, but work on desktop.
+
+**Cause**: Android/iOS browsers invalidate File object references after accessing properties (`file.name`, `file.size`, `file.type`) due to **SnapshotState** in the W3C File API. See [Chromium Bug #40703873](https://issues.chromium.org/40703873).
+
+**Solution**: Clone the file into memory immediately after selection, before accessing any properties:
+```javascript
+const handleFile = async (file) => {
+  // Validations first...
+
+  // FIX: Clone file to memory to avoid SnapshotState invalidation
+  const arrayBuffer = await file.arrayBuffer()
+  const clonedFile = new File([arrayBuffer], file.name, {
+    type: file.type,
+    lastModified: file.lastModified
+  })
+  selectedFile.value = clonedFile
+}
+```
+
+**Applied in**: `src/modules/data-entry/components/ocr/OCRUploadZone.vue`
+
 ---
 
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