[UIR-028] Add premium-aware notifications

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Outline

Summary

Adds premium-aware inbox notification rendering for copy and profile view alerts, including anonymous free-member copy rows and named premium rows.

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Changes & Enhancements

• Type of Change:
  • Feature
  • Bugfix
  • Refactor
  • Chore
• Changes:
  • Inbox:
    • Adds structured copy/view notification data with premium gating and guest fallbacks.
    • Adds the free-member Premium upsell link to the settings premium tab.
  • Stories:
    • Adds free, premium, and empty inbox stories with play coverage for the notification rules.

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Page / App Changes

Affected Next.js Routes (Local):
/[lang]/settings#premium

Before (Screenshot)

After (Screenshot)

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Component / Storybook Changes

Affected Storybook Components (Local):

• Components/Inbox > Free Notifications
• Components/Inbox > Premium Notifications
• Components/Inbox > Empty

Before (Screenshot)

After (Screenshot)

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Not Doing

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Other (Remarks)

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Checklists

• Code is well-documented (comments, JSDoc, etc.).
• Existing comments were updated as needed.
• No out-of-scope changes are included.
• Write TODO comments where future work is required.
• Removed unnecessary debug code (e.g., console.log, debugger).
• Self-reviewed and tested locally.