feat: FASE 4 - Editor Maker (Fabric.js) con annotazioni, task editor, preview e storico versioni

- recipe_list.html: lista ricette con filtri, paginazione, cards Alpine.js
- recipe_editor.html: form metadati, upload drag-and-drop, canvas Fabric.js per annotazioni
- annotation-editor.js: editor annotazioni Fabric.js (marker, frecce, rettangoli, zoom, pan)
- task_editor.html: editor task/subtask inline con drag-and-drop reorder e tolleranze
- recipe_preview.html: anteprima ricetta come MeasurementTec
- version_history.html: timeline versioni con conteggio misurazioni AJAX
- maker.py: 6 route pagina + 13 proxy AJAX, gestione sicura risposte lista API
- i18n: 170+ stringhe tradotte IT/EN per tutti i template Maker

Architect review: 3 CRITICO + 5 MEDIO + 3 NEW risolti, 2 BASSO differiti

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/verify_i18n.py

@@ -0,0 +1,118 @@
+#!/usr/bin/env python
+"""Verify i18n setup for TieMeasureFlow."""
+import json
+from pathlib import Path
+
+def check_file(path: Path, description: str) -> bool:
+    """Check if a file exists and report."""
+    exists = path.exists()
+    status = "[OK]" if exists else "[FAIL]"
+    print(f"{status} {description}: {path}")
+    return exists
+
+def check_json_valid(path: Path) -> bool:
+    """Check if JSON file is valid."""
+    try:
+        with open(path, 'r', encoding='utf-8') as f:
+            json.load(f)
+        return True
+    except Exception as e:
+        print(f"  ERROR: {e}")
+        return False
+
+def main():
+    """Verify i18n setup."""
+    print("=== TieMeasureFlow i18n Verification ===\n")
+
+    root = Path(__file__).parent
+    all_good = True
+
+    # Check Flask-Babel files
+    print("Flask-Babel (Server-side):")
+    files = [
+        (root / "translations/babel.cfg", "Babel config"),
+        (root / "translations/it/LC_MESSAGES/messages.po", "Italian .po"),
+        (root / "translations/it/LC_MESSAGES/messages.mo", "Italian .mo"),
+        (root / "translations/en/LC_MESSAGES/messages.po", "English .po"),
+        (root / "translations/en/LC_MESSAGES/messages.mo", "English .mo"),
+    ]
+
+    for path, desc in files:
+        if not check_file(path, desc):
+            all_good = False
+
+    # Count messages in .po files
+    if (root / "translations/it/LC_MESSAGES/messages.po").exists():
+        with open(root / "translations/it/LC_MESSAGES/messages.po", 'r', encoding='utf-8') as f:
+            content = f.read()
+            msgid_count = content.count('msgid "') - 1  # Exclude header
+            print(f"  Italian: {msgid_count} messages")
+
+    if (root / "translations/en/LC_MESSAGES/messages.po").exists():
+        with open(root / "translations/en/LC_MESSAGES/messages.po", 'r', encoding='utf-8') as f:
+            content = f.read()
+            msgid_count = content.count('msgid "') - 1
+            print(f"  English: {msgid_count} messages")
+
+    # Check Alpine.js i18n files
+    print("\nAlpine.js i18n (Client-side):")
+    json_files = [
+        (root / "static/js/locales/it.json", "Italian locale"),
+        (root / "static/js/locales/en.json", "English locale"),
+    ]
+
+    for path, desc in json_files:
+        if check_file(path, desc):
+            if not check_json_valid(path):
+                all_good = False
+            else:
+                with open(path, 'r', encoding='utf-8') as f:
+                    data = json.load(f)
+                    keys = count_keys(data)
+                    print(f"  {keys} total keys")
+
+    # Check app.py integration
+    print("\nApp Integration:")
+    app_py = root / "app.py"
+    if check_file(app_py, "app.py"):
+        with open(app_py, 'r', encoding='utf-8') as f:
+            content = f.read()
+            checks = [
+                ("from flask_babel import Babel", "Flask-Babel imported"),
+                ("def get_locale()", "get_locale() function"),
+                ("Babel(app, locale_selector=get_locale)", "Babel initialized"),
+                ("def set_language(lang)", "set_language endpoint"),
+            ]
+            for check_str, check_desc in checks:
+                found = check_str in content
+                status = "[OK]" if found else "[FAIL]"
+                print(f"  {status} {check_desc}")
+                if not found:
+                    all_good = False
+
+    # Summary
+    print("\n" + "="*40)
+    if all_good:
+        print("[OK] i18n setup verified successfully!")
+        print("\nNext steps:")
+        print("1. Use _() in Python code and templates")
+        print("2. Use $t() in Alpine.js components")
+        print("3. Test language switching: /set-language/en or /set-language/it")
+    else:
+        print("[FAIL] Some checks failed - review errors above")
+        return 1
+
+    return 0
+
+def count_keys(obj, depth=0):
+    """Recursively count keys in nested dict."""
+    if not isinstance(obj, dict):
+        return 0
+    count = len(obj)
+    for value in obj.values():
+        if isinstance(value, dict):
+            count += count_keys(value, depth + 1)
+    return count
+
+if __name__ == '__main__':
+    exit(main())