[PROFILE-004] Add profile completeness score

[chev0004]

Outline

Summary

Adds a transparent profile completeness score that surfaces a profile strength meter in the editor and lets discovery rank the most complete public profiles first.

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Changes & Enhancements

• Type of Change:
  • Feature
  • Bugfix
  • Refactor
  • Chore
• Changes:
  • (lib):
    • Add computeProfileCompleteness, a weighted, easy-to-change rule set over primary language, target languages, bio, availability, tags, and country.
  • (profile):
    • Add a ProfileStrength panel to the editor aside showing the score and a list of high-value missing fields that updates live as fields are filled.
  • (discovery):
    • Add a "Most complete" sort option that prefers complete public profiles, tie-breaking on recency then name.

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Page / App Changes

Affected Next.js Routes (Local):

• /[lang]/profile
• /[lang]

Before (Screenshot)

After (Screenshot)

Profile editor with the live profile strength meter:

Discovery sort menu with the new "Most complete" option:

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Component / Storybook Changes

Affected Storybook Components (Local):

• Features/Profile/ProfileStrength > Complete
• Features/Profile/ProfilePage > ProfileStrengthComplete
• Discovery/SortMenu > Default

Before (Screenshot)

After (Screenshot)

ProfileStrength complete, partial, and empty states:

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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.