Saved calculation history for signed-in users

[YurMil]

Store a signed-in user's recent calculations (utility id + input snapshot + timestamp) so they can reopen previous work from their profile.

Builds on the shareable-link input serialization (same versioned schema) and the existing Supabase infrastructure (user_settings / user_utility_usage patterns, RLS per user).

Why: recurring calculations (same vessel family, similar orders) are the norm in this domain; history turns a one-off visit into a returning habit and gives an account real utility.

Acceptance criteria:

• History list in the profile with reopen action
• RLS: each user sees only their own entries; capped per user with oldest-first eviction
• Delete-account flow wipes history (extend existing self-service functions)
• Localized UI in all 6 locales

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