feat: prompt user to fill in profile details before adding a company

[neversettle17-101]

Summary

• Adds a UserDetailsModal that appears when the user first focuses the company name input and their profile is missing name or email
• The modal lets them fill in all profile fields (name, email, title, location, previous company, university) and save inline without navigating away
• Once saved (or skipped), the modal won't show again for the session — tracked via a useRef flag

Behaviour

1. User visits the home page and clicks on the company name input
2. If name or email is not set in their profile, a modal slides in prompting them to fill in their details
3. They can save and continue, or skip for now
4. The workflow then proceeds as normal

Closes #3

Test plan

• Start with a fresh/empty profile — focus the company input, confirm modal appears
• Fill in name + email and click "Save & continue" — confirm data is saved and modal closes
• Click "Skip for now" — confirm modal closes and doesn't reappear on re-focus
• If profile already has name + email, confirm modal does NOT appear on focus
• Confirm all existing outreach functionality is unaffected

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