fix: version badge rendering, Jinja2 scoping, navbar i18n, missing GET task endpoint

- Fix version badge showing [object Object] or Python dict dump in
  select_recipe, task_list, and task_complete templates by accessing
  current_version.version_number instead of the whole object
- Fix recipe_editor.html Internal Server Error caused by Jinja2 block
  scoping: {% set %} variables from block content were invisible in
  block extra_js, replaced with direct recipe.* references
- Fix task_editor.html SyntaxError from Italian apostrophe in
  nell'eliminazione breaking JS string literals, switched to |tojson
- Add i18n {{ _() }} wrappers to all hardcoded navbar strings (desktop
  and mobile menus) so language toggle works correctly
- Add app title text "TieMeasureFlow" next to logo in navbar
- Add missing GET /api/tasks/{task_id} endpoint on server that caused
  405 Method Not Allowed when starting measurements

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

client/templates/measure/select_recipe.html

@@ -150,7 +150,7 @@
             </span>
             <span class="badge badge-neutral text-xs"
                   x-show="recipe.current_version || recipe.version"
-                  x-text="'v' + (recipe.current_version || recipe.version || '')">
+                  x-text="'v' + (recipe.current_version ? recipe.current_version.version_number : (recipe.version || ''))">
             </span>
           </div>
 

client/templates/measure/task_complete.html

@@ -55,7 +55,7 @@
                 </div>
                 <div>
                     <p class="text-sm font-medium mb-1" style="color: var(--text-muted);">{{ _('Versione') }}</p>
-                    <p class="font-mono font-medium" style="color: var(--text-primary);">{{ recipe.current_version or recipe.version }}</p>
+                    <p class="font-mono font-medium" style="color: var(--text-primary);">{{ recipe.current_version.version_number if recipe.current_version else recipe.version }}</p>
                 </div>
                 <div>
                     <p class="text-sm font-medium mb-1" style="color: var(--text-muted);">{{ _('Lotto') }}</p>
@@ -299,7 +299,7 @@ window.CSV_I18N = {
 window.measurementData = {
     recipeName: {{ recipe.name|tojson }},
     recipeCode: {{ recipe.code|tojson }},
-    version: {{ (recipe.current_version or recipe.version)|tojson }},
+    version: {{ (recipe.current_version.version_number if recipe.current_version else recipe.version)|tojson }},
     lotNumber: {{ (lot_number or '')|tojson }},
     serialNumber: {{ (serial_number or '')|tojson }},
     measurements: {{ measurements|tojson }}

client/templates/measure/task_list.html

@@ -44,7 +44,7 @@
             <!-- Version Badge -->
             {% if recipe.current_version or recipe.version %}
             <span class="badge badge-neutral">
-              v{{ recipe.current_version or recipe.version }}
+              v{{ recipe.current_version.version_number if recipe.current_version else recipe.version }}
             </span>
             {% endif %}
           </div>