fix: barcode EAN checksum validation + recipe persons dialog conflict

- Manual barcode input now blocks on invalid EAN checksum (was warning-only)
- Native BarcodeDetector now validates EAN/UPC checksum before confirming
- Renamed duplicate adjustRecipePersons (rescaler) to scaleRecipePersons
  to restore +/- buttons in the recipe generation dialog
- Added error.barcode_checksum translation key (all 5 languages)
- Bump version to v1.7.35

translations/en.json

@@ -151,6 +151,12 @@
     "banner_anomaly_untracked_detail": "You have <strong>{inv_qty} {unit}</strong> in inventory, but recorded outflows exceed inflows — the initial stock was likely never added as an \"in\" transaction. You can correct the quantity or log the missing entries.",
     "banner_anomaly_ghost_title": "you have less stock than expected",
     "banner_anomaly_ghost_detail": "Based on recorded operations you should have {expected_qty} {unit} of {name}, but inventory shows only {inv_qty} {unit}. Did you take stock without recording it?",
+    "banner_dup_loss_title": "Double-consume check: {name}",
+    "banner_dup_loss_detail": "Possible duplicate entry in {location}: two close out events ({qty_pair}) in ~{seconds}s. Please verify and fix if needed.",
+    "banner_dup_loss_action_fix": "Fix quantity",
+    "banner_dup_loss_action_open": "Open product card",
+    "banner_dup_loss_action_done": "Already checked",
+    "banner_dup_loss_toast_done": "Check marked as reviewed",
     "consumed": "Consumed: {n} ({pct}%)",
     "wasted": "Wasted: {n} ({pct}%)",
     "more_opened": "and {n} more opened...",
@@ -221,10 +227,23 @@
     "status_invalid": "Invalid: {code} — retrying",
     "status_confirmed": "Confirmed!",
     "status_parallel": "Using combined scan methods...",
+    "status_ocr_searching": "Reading the barcode digits...",
+    "status_ai_visual_searching": "Now trying to recognize the product...",
+    "method_ai_ocr": "Gemini OCR",
+    "method_ai_vision": "Gemini Vision",
     "ai_fallback_searching": "AI identifying product...",
     "ai_fallback_found": "Product identified by AI",
     "ai_fallback_not_found": "AI: product not recognized",
-    "ai_fallback_exhausted": "AI: product not recognized — try scanning the barcode"
+    "ai_fallback_exhausted": "AI: product not recognized — try scanning the barcode",
+    "ai_overlay_msg": "Gemini Vision is analyzing the product...",
+    "ai_retry_btn": "Retry with AI",
+    "ai_match_title": "Product recognized by AI",
+    "ai_match_subtitle": "Choose an existing pantry item or add the detected one.",
+    "ai_match_existing": "Possible pantry matches",
+    "ai_match_none": "No similar pantry products found.",
+    "ai_match_use_btn": "Use this",
+    "ai_match_add_btn": "Add \"{name}\"",
+    "ai_detected_label": "AI detected"
   },
   "action": {
     "title": "What do you want to do?",
@@ -1069,6 +1088,7 @@
     "ai_quota": "AI quota exhausted. Please try again in a few minutes.",
     "barcode_empty": "Enter a barcode",
     "barcode_format": "Barcode must contain only numbers (4-14 digits)",
+    "barcode_checksum": "Invalid EAN checksum — please check the barcode digits",
     "min_chars": "Type at least 2 characters",
     "not_in_inventory": "Product not in inventory",
     "appliance_exists": "Appliance already exists",