Add optional user profile fields

[jakebromberg]

Closes #235

Summary

Adds 7 new optional profile fields for DJ accounts:

• pronouns - User's pronouns (e.g., "they/them")
• namePronunciation - Phonetic pronunciation guide
• showTimes - When the DJ has their show
• title - Role/title at the station
• semesterHired - When they joined (e.g., "Fall 2024")
• bio - Short biography (multi-line)
• location - Where they're based

UI Changes

• Redesigned SettingsPopup with 2-column grid layout
• Organized fields into sections: Identity, Station Info, About
• Created new SettingsTextarea component for bio field

Files Changed

• lib/features/authentication/types.ts - Added fields to User type
• lib/features/authentication/utilities.ts - Added fields to BetterAuthSession, updated conversion functions
• lib/features/authentication/frontend.ts - Added modification tracking
• src/hooks/djHooks.ts - Updated save handler
• src/components/experiences/modern/settings/SettingsPopup.tsx - Redesigned UI
• src/components/experiences/modern/settings/SettingsTextarea.tsx - New component

Prerequisites

The Better Auth server at api.wxyc.org needs matching additionalFields configuration:

user: {
  additionalFields: {
    pronouns: { type: "string", required: false },
    namePronunciation: { type: "string", required: false },
    showTimes: { type: "string", required: false },
    title: { type: "string", required: false },
    semesterHired: { type: "string", required: false },
    bio: { type: "string", required: false },
    location: { type: "string", required: false },
  }
}

Test plan

• Verify TypeScript compilation passes
• Test settings popup opens and displays all fields
• Test editing fields enables Save button
• Test saving changes (requires server configuration)
• Verify saved data persists after page refresh

Note: E2E tests depend on #271 and WXYC/Backend-Service#223. E2E will pass once those merge.

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