feat: add user setting to show ingredient notes inline

[guguinhaaax]

Fixes #455

Previously, ingredient notes were hidden behind a tooltip icon requiring a hover or tap to view. This made notes hard to discover and inconvenient to use, especially on mobile devices or while cooking.

This PR adds a new user preference show_ingredient_notes that allows users to choose whether ingredient notes are displayed inline (below the ingredient) or as a tooltip (previous behavior).

Changes:

• cookbook/models.py: added show_ingredient_notes BooleanField (default=True)
• cookbook/migrations/0243_userpreference_show_ingredient_notes.py: migration for new field
• cookbook/serializer.py: exposed show_ingredient_notes in UserPreferenceSerializer
• vue3/src/components/display/IngredientsTable.vue: render note inline when setting is enabled, tooltip otherwise
• vue3/src/components/settings/CosmeticSettings.vue: added checkbox to toggle the setting
• vue3/src/locales/en.json: added translation strings for the new setting

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